AMETEK SORENSEN DLM 60-10 (01) PDF Document

Before applying power, verify the product is configured properly for your application.

WARNINGS:

• Hazardous voltages may be present when covers are removed. Qualified personnel must use extreme caution when servicing this equipment. Circuit boards, test points, and output voltages also may be floating above (below) chassis ground.

• The equipment used contains ESD sensitive ports. When installing equipment, follow ESD Safety Procedures. Electrostatic discharges might cause damage to the equipment.

Guidelines:

• Only qualified personnel who deal with attendant hazards in power supplies are allowed to perform installation and servicing.

• Ensure that the AC power line ground is connected properly to the Power Rack input connector or chassis. Similarly, other power ground lines including those to application and maintenance equipment must be grounded properly for both personnel and equipment safety.

• Always ensure that facility AC input power is de-energized prior to connecting or disconnecting any cable.

• In normal operation, the operator does not have access to hazardous voltages within the chassis. However, depending on the user’s application configuration, HIGH VOLTAGES HAZARDOUS TO HUMAN SAFETY may be normally generated on the output terminals. The customer/user must ensure that the output power lines are labeled properly as to the safety hazards and that any inadvertent contact with hazardous voltages is eliminated.

• Guard against risks of electrical shock during open cover checks by not touching any portion of the electrical circuits. Even when power is off, capacitors may retain an electrical charge. Use safety glasses during open cover checks to avoid personal injury by any sudden component failure.

The safety symbols indicate the following:

• WARNING, Risk of Electrical Shock: A lightning bolt symbol within a triangle.

• CAUTION, Refer to Accompanying Documents: An exclamation point symbol within a triangle.

• Off (Supply): An open circle.

• Direct Current (DC): A solid line above a dashed line.

• Standby (Supply): A vertical line partially inside an open circle.

• Alternating Current (AC): A wavy line (tilde).

• On (Supply): A solid vertical line.

• Three-Phase Alternating Current: A wavy line with the number 3 above it.

• Protective Conductor Terminal: A circle with ground symbol lines inside it.

• Earth (Ground) Terminal: The standard symbol for earth ground.

• Fuse: A rectangle with a line passing through it.

• Chassis Ground: The standard symbol for chassis ground.

First, perform a visual inspection of the shipping container before accepting the package from the carrier. If damage to the container is evident, note it on the carrier’s receipt and have the driver sign it.

After removing the unit from the container, perform another visual inspection. Check for shipping damage such as dents, scratches, distortion of the enclosure, or damaged controls. If external damage is found, there may be internal damage as well. Immediately contact the carrier to file a claim for concealed damage and save the shipping container and filler material for inspection. Report the damage to the Service Department for instructions on repair or replacement.

The AMETEK SORENSEN DLM 60-10 power supply is designed for both rackmount and benchtop applications. It is shipped configured for benchtop use. For rack mounting, remove the four feet from the bottom of the chassis and add the rackmount kit.

Since the unit is fan-cooled, it requires adequate clearance for air intake and exhaust so that airflow is not impeded. The air intake is at the front and front sides, while the air exhaust is at the rear panel and rear sides. The temperature of the ambient air at the intake should not exceed 50°C.

To install a single unit in a rack using the Rack Mount Kit (Sorensen part number DLMRK), follow these steps:

1. Remove the four (4) rubber feet and mounting hardware from the bottom of the unit and discard them.

2. Remove the four (4) truss head screws (two on each side) from the front side panels of the unit. Do not discard these screws.

3. The unit can be mounted on the right or left side of the rack.

4. Install a Rack Mount Extruded Ear on the front side of the unit using two (2) of the existing truss head screws you removed earlier.

5. Install the Single-Unit Rack Mount Bracket on the opposite side from the Extruded Ear using two (2) panhead SEMS screws (6-32UNC-2A x .25″) supplied in the kit.

6. Install the other Rack Mount Extruded Ear on the end of the Single-Unit Rack Mount Bracket using the remaining two (2) existing truss head screws.

7. Position one of the two Chassis Rack Mount Brackets on the chassis side of the rack. If needed, use one of the two (2) Right Angle Adapter Brackets to match existing vertical rack rail positions.

CAUTION: To prevent internal damage, use only the specified screw lengths. The unit will not stay on the Chassis Rack Mount Bracket until at least one of the four (4) front panel mounting screws is installed.

To install two units side-by-side in a rack using the Rack Mount Kit (Sorensen part number DLMRK), follow these steps:

1. Remove the four (4) rubber feet and mounting hardware from the bottom of both units and discard them.

2. Remove the four (4) truss head screws (two on each side) from the front side panels of both units. Do not discard these screws.

3. Install the Tie Bar onto the bottom of the two (2) inner heat sinks using the six (6) Philips flat head screws (6-32UNC-2A X .31″) supplied in the kit.

4. Install the Rack Mount Extruded Ears on the front outer sides of both units using the existing four (4) truss head screws.

5. Position the two Chassis Rack Mount Brackets in the rack. If needed, use the two (2) Right Angle Adapter Brackets to match existing vertical rack rail positions.

CAUTION: To prevent internal damage, use only the specified screw lengths.

The AMETEK SORENSEN DLM 60-10 will operate from an AC power source rated at 90–132 VAC and 180–264 VAC, at 47–63 Hz. The AC input voltage range is automatically selected by the unit at power-up; no user setup is required.

CAUTION: Exceeding the maximum rated AC input voltage could result in damage to the unit.

An IEC connector is provided on the rear panel for connecting the unit to the AC power source with a power cord. The power cord supplied includes a safety ground wire that connects the unit’s enclosure to the safety ground of the AC power source.

WARNING: Operating the unit with the safety ground wire of the power cord disconnected could result in a shock hazard.

Fuses are provided for both lines of the AC input and are located internally on the main circuit board near the AC input connector. They have time-delay characteristics and are rated at 20A/250VAC. These fuses are sized for fault isolation and should not require replacement during normal operation. If a fuse opens, replacement should be done by qualified personnel to determine if a fault condition exists.

WARNING: To prevent electrical shock, disconnect the AC power cord before checking the internal fuses. Operating with fuses of an improper rating could result in a fire hazard.

WARNING: To prevent electrical shock, disconnect the AC power cord before making any connections to the unit.

The AMETEK SORENSEN DLM 60-10 (a low-voltage model rated 5V–60V) has bus bars at the rear for connecting the load. These bus bars are protected with a two-piece cover. The top portion is removable for access to the screws and has scored sections that can be removed for a larger wiring opening.

Ensure wires are routed properly to prevent shorting, and that the cover is correctly installed before applying AC power. For applications like rack mounting where the bus bars are not operator accessible, both portions of the cover could be removed, but ensure adequate protection from accidental contact is provided for service personnel.

CAUTION: If longer bus bar screws are substituted, ensure that a clearance of at least 0.125” (3.2 mm) exists to the rear panel to prevent an electrical short.

When selecting a wire gauge for the load, consider:

• The current carrying capacity of the wire.

• The voltage drop across the total length of the load lines.

• Noise coupling and impedance effects of the load lines.

Load wiring must have a current carrying capacity greater than the output current rating of the power supply to ensure it won’t be damaged if the load is shorted. The maximum current a wire can conduct depends on ambient temperature, insulation rating, wire bundling, and altitude. The temperature rise of the wire from current flow, plus the ambient temperature, must not exceed the maximum operating temperature of the insulation.

The following table shows the current rating for various wire gauges, based on 500A/cm².

To minimize noise pickup or radiation from load circuits, follow these guidelines:

• Use twisted-pair wires with minimum lead length for both load and remote sense wires.

• Shielding of the sense leads may be necessary in high-noise environments. If so, connect one end of the shield to the ground stud next to the sense connector and leave the other end unconnected.

• Always twist load and remote sense wires as pairs to reduce coupling, which can impact power supply stability.

• If using connectors, ensure terminals for sense leads are in adjacent locations and minimize the physical loop area of untwisted portions. Ideally, separate the sense leads from the power leads with their own connector.

• Twisting load wires also reduces parasitic inductance, improving dynamic response at the load. For long load wires, additional filtering with bypass capacitors at the load terminals may be needed to bypass high-frequency load currents and prevent voltage spikes.

Remote sensing is used to compensate for voltage drop across the load wires. To set it up:

1. Select remote sensing by setting REM SNS on the SETUP switch (Position-1) to ON.

2. Route a separate pair of wires from the REMOTE SENSE (REM SNS) connector on the rear panel to the load terminals. Connect the positive (+) and negative (-) sense leads to the respective terminals of the load.

3. The sense leads should be a twisted-pair of at least AWG #22 wire. Shielding may be required in high-noise environments. Follow best practices for routing sense leads to prevent noise pickup.

Important Notes:

• If the unit is set for remote sense but the sense wires are not connected, the unit will revert to local sense, and the output voltage at the rear panel will increase by about 5% above the programmed value.

• If remote sensing is enabled but sense leads are not connected to the output, the power supply will shut down due to OVP.

The REMOTE SENSE (REM SNS) connector is a 2-position Molex #39-30-0023 with the following pinout:

The output is isolated from chassis ground, allowing for positive, negative, or floating outputs (up to 300 VPK).

WARNING: The REMOTE ANALOG INTERFACE, REMOTE SENSE, and PARALLEL I/O signals are connected to the negative (return) output terminal. If this terminal is floated, these signals will also float at the same potential. Use appropriate safety measures.

CAUTION: Operating the supply with either output lead floated greater than 300 VPK above chassis ground could result in damage.

Connecting Single Loads:

Connect the load directly to the rear panel output terminals. Twist the load wires or keep them closely parallel for their entire length. Use the heaviest gauge practical to minimize line drop. You can use either local or remote sensing.

Connecting Multiple Loads:

When voltage regulation is critical, connect each load independently to the terminals where the voltage is sensed. This prevents load currents from creating mutually coupled voltage drops in the connecting leads.

If using a distribution bus, remote sensing is generally used. The point of sensing should be selected to minimize interaction between loads due to line drops. Typically, you would sense the voltage at the point where the power leads connect to the distribution bus.

Up to four units of the same model can be connected in parallel in a master/slave configuration. The master controls the output voltage and total current, and the units share the output current equally. Either local or remote sensing can be used.

CAUTION: The outputs of paralleled units must be wired in parallel at their rear panel output terminals using the shortest practical cable length. Operation without a negative (return) connection could cause damage.

Setup Procedure:

1. Connect the outputs of the units in parallel at the rear panel using short cables. Connect the load wires to the output terminals of the master unit.

2. Interconnect the master and slave units with the PARALLELING CABLE (Sorensen part number DLMP1) using either of the two rear panel PARALLEL I/O connectors.

3. For each slave unit, select slave mode by turning ON the SLAVE position (Position-2) of its SETUP switch. The master unit must have the SLAVE position set to OFF.

4. Adjust the OVP setting of each slave unit to full scale.

5. The voltage, current, and OVP are adjusted using the controls of the master unit. The voltage display of the slave units will be blanked out. The total load current is the sum of the current displays of all units.

6. The OUTPUT switch on the master turns all units off. A slave’s OUTPUT switch only turns off its own output.

7. Turning off the POWER switch of any unit will shut down all units.

8. A shutdown in any unit (due to a fault, OVP, etc.) will shut down all units.

9. External control via the REMOTE-ANALOG INTERFACE is done through the master unit.

PARALLEL I/O Connector Pinout (Molex #43045-0602):

Multiple units of the same model can be connected in series to obtain a higher output voltage, within the 300V(PK) maximum float potential limit. Interconnect the supplies by connecting the negative terminal of one supply to the positive terminal of the other.

The total output voltage is the sum of the individual outputs and is taken from the positive and negative terminals of the total string. Each supply is adjusted individually. The output current is the same for each unit. Either local or remote sensing can be used for each unit individually.

CAUTION: To prevent damage to a supply, do not connect the remote sense leads of one supply across the total series string.

Yes. The AMETEK SORENSEN DLM 60-10 requires freewheeling and blocking diodes when driving inductive loads or batteries. This protects the power supply from damage caused by power being fed back into the supply and from high voltage transients.

Suggested Diode Selection:

• Peak Reverse Voltage: Should be a minimum of 2-3 times the power supply’s maximum output voltage.

• Continuous Forward Current: Should be a minimum of 1.5 times the power supply’s maximum output current. A heatsink may be required.

Higher voltage rated parts may be needed depending on the load circuit design and inductor values.

Perform the following checks to ensure the unit is functioning correctly.

Power-On Check

1. Ensure POWER and OUTPUT switches are OFF (buttons out).

2. Ensure no connections are made to the REMOTE ANALOG INTERFACE connector, and all positions of the SETUP switch are OFF (down).

3. Turn the VOLTAGE and CURRENT controls fully counter-clockwise.

4. Turn the OVP control fully clockwise.

5. Connect the power cord to an AC source.

6. Turn the front panel POWER switch ON (button in). The unit will run a power-up routine for about 7 seconds: all LEDs will light, displays will light, fans will run at max speed, and OVP/FAULT monitors will reset.

7. After power-up, check that both digital displays are on and indicate zero. The OVP, FAULT, EXT-OFF, REM, and OUTPUT LEDs should be off.

8. Turn the POWER switch ON.

9. Turn the CURRENT control fully clockwise.

10. Ensure the VOLTAGE indicator is on and the CURRENT indicator is off.

Constant-Voltage Mode Operation Check

1. Ensure POWER and OUTPUT switches are OFF.

2. Connect a digital voltmeter (DVM) to the output terminals.

3. Turn VOLTAGE control fully counter-clockwise and CURRENT control fully clockwise.

4. Turn POWER and OUTPUT switches ON (buttons in).

5. Slowly turn the VOLTAGE control clockwise and observe the values on the VOLTAGE display and DVM. Adjust across the full range.

6. Compare the DVM and display readings to verify accuracy. The VOLTAGE indicator should be on and the CURRENT indicator should be off.

Constant-Current Mode Operation Check

1. Ensure POWER and OUTPUT switches are OFF.

2. Connect a DC shunt across the output terminals. Ensure the shunt and wiring exceed the supply’s current capability.

3. Connect a DVM across the DC shunt.

4. Turn CURRENT control fully counter-clockwise and VOLTAGE control fully clockwise.

5. Turn POWER and OUTPUT switches ON.

6. Slowly turn the CURRENT control clockwise and observe the values on the CURRENT display and DVM. Adjust across the full range.

7. Compare the DVM reading (converted to current) with the display reading to verify accuracy. The CURRENT indicator should be on and the VOLTAGE indicator should be off.

The power supply automatically crosses over between constant-voltage (CV) and constant-current (CC) mode based on the load resistance relative to the voltage and current settings. The VOLTAGE or CURRENT front panel LED indicates the active mode.

Adjustment for Constant-Voltage (CV) Operation:

1. Turn the POWER switch ON and the OUTPUT switch OFF.

2. Press the V/I PREVIEW switch to display the programmed settings. Adjust the controls to set the desired output voltage and an output current that is greater than the maximum peak current required by the load. If the load attempts to draw more current than the setting, the supply will enter CC mode.

3. Turn the OUTPUT switch ON. The VOLTAGE indicator should be ON, and the CURRENT indicator should be OFF.

Adjustment for Constant-Current (CC) Operation:

1. Turn the POWER switch ON and the OUTPUT switch OFF.

2. Press the V/I PREVIEW switch to display the programmed settings. Adjust the controls to set the desired output current and an output voltage that is greater than the maximum peak voltage required by the load. If the load voltage attempts to exceed the setting, the supply will enter CV mode.

3. Turn the OUTPUT switch ON. The CURRENT indicator should be ON, and the VOLTAGE indicator should be OFF.

The OVP monitor protects the load from overvoltage conditions. When tripped, it turns off the output converter, discharges the output capacitors, and turns on the front panel OVP indicator.

Adjusting the OVP Threshold:

1. Turn the POWER switch ON and the OUTPUT switch OFF.

2. Press the V/I PREVIEW switch to set your desired output voltage and current.

3. Press the OVP PREVIEW switch to display the programmed OVP threshold. Use the OVP SET control to adjust it. Ensure the OVP setting exceeds the output voltage setting; otherwise, the OVP will trip as soon as the output is turned ON.

4. To verify OVP operation: set the OVP threshold to less than the full-scale output voltage rating. Set the output voltage to less than the OVP threshold. Turn the OUTPUT switch ON. Adjust the output voltage upwards until it exceeds the OVP threshold. The output should shut down, and the OVP indicator will turn on.

Resetting a Tripped OVP:

1. Reduce the power supply’s output voltage setting to below the OVP threshold.

2. Ensure the power and sense lead connections are correct.

3. Reset the OVP monitor by toggling OFF and then back ON one of the following: the OUTPUT switch, the POWER switch, or the EXTERNAL-OFF signal of the REMOTE ANALOG INTERFACE.

• POWER Switch: Turns on the autoranging AC input rectifier and control circuits. It initiates a ~7 second power-up routine (indicator/display test, fan start-up, rectifier range setting). This switch does not disconnect the AC input lines from the unit.

• OUTPUT Switch: Turns the output converter on and off. It also resets the OVP and FAULT monitors when toggled. When turned off, it enables the downprogrammer to discharge output capacitors. For parallel operation, the master’s OUTPUT switch turns all units off, while a slave’s switch only affects its own output.

• V/I and OVP PREVIEW Switches: These momentary switches allow the front panel displays to show the programmed values for output voltage, current, and OVP. This lets you set parameters before turning on the output without disturbing load connections.

• LOCAL/REMOTE Switch: Allows selection between front panel controls and a remote interface (analog or GPIB) for programming. With the REMOTE ANALOG INTERFACE, it toggles control between local and remote. The LOCAL-LOCKOUT signal can disable this toggling. With the GPIB interface, pressing the switch transfers control to the front panel, but a command from the GPIB controller is needed to return to remote control.

When using the power supply to charge a battery, follow these precautions:

1. Connect an isolation diode in series with one of the output terminals. This prevents the battery from discharging back into the power supply if the supply is turned off. The diode must have suitable current and voltage ratings and be mounted on an appropriate heat sink.

2. Adjust the VOLTAGE setting to the desired float voltage. Use the V/I PREVIEW switch or disconnect the battery to do this. If using local sensing, the VOLTAGE setting should compensate for the voltage drop across the isolation diode.

3. Adjust the CURRENT setting to the desired current limit for charging.

During charging, the supply will initially operate in constant-current mode. As the battery charges, its voltage increases. When it reaches the set float voltage, the supply will switch to constant-voltage mode, and the battery current will decrease to a low float level as it becomes fully charged.

The 8-position SETUP switch on the rear panel configures the power supply for user requirements. The factory default is all positions OFF (down). The functions are as follows:

• REM SNS (Pos-1): Selects remote sensing (ON) or internal sensing (OFF).

• SLAVE (Pos-2): Configures the unit for slave operation (ON) or master/standalone operation (OFF).

• IMON, 10V-Select (Pos-4): Selects the range for remote readback of output current (0–5V or 0–10V).

• VMON, 10V-Select (Pos-5): Selects the range for remote readback of output voltage (0–5V or 0–10V).

• OVP, 10V-Select (Pos-6): Selects the range for remote programming of the OVP threshold (0–5V or 0–10V).

• I, 10V-Select (Pos-7): Selects the range for remote programming of output current (0–5V or 0–10V).

• V, 10V-Select (Pos-8): Selects the range for remote programming of output voltage (0–5V or 0–10V).

The REMOTE ANALOG INTERFACE is a 25-position female subminiature-D connector that provides remote control and monitoring. The pinout is as follows:

Remote programming can be done using external voltage sources or resistances to control output voltage, current, and OVP. The front panel V/I and OVP PREVIEW switches remain functional to verify programmed settings. The LOCAL/REMOTE switch allows toggling between front-panel and remote control.

CAUTION: Ensure the unit is unplugged from AC input before making any changes to remote interface connections or SETUP switch settings.

CAUTION: The signals of the REMOTE ANALOG INTERFACE connector have internal connections to the output negative (return) terminal. Damage could result if they are connected to the power supply output positive.

The options for remote control operation are:

When remote programming is enabled, front panel control is disabled. All three parameters (V, I, OVP) must be set remotely. Parameters not being actively controlled should be programmed to a desired limit, for example by using resistance programming or connecting them to the AUXILIARY 5V OUTPUT (with the 0–5 VDC range selected) for full-scale programming.

NOTE: For all voltage-source programming, you must program the other two parameters to desired limit values. This is mandatory for the power supply to work properly. For example, if programming Voltage, you must also set limits for Current and OVP.

Programming Output Voltage:

1. Set SETUP switch Position-8 to OFF for 0–5 VDC range or ON for 0–10 VDC range.

2. Connect the external programming voltage source positive to Pin-9 and negative to Pin-12.

3. Program CURRENT (Pin-10) and OVP (Pin-3) to desired limits.

4. Connect Pin-1 (ANALOG-CONTROL) to Pin-6 to enable remote control.

Programming Output Current:

1. Set SETUP switch Position-7 to OFF for 0–5 VDC range or ON for 0–10 VDC range.

2. Connect the external programming voltage source positive to Pin-10 and negative to Pin-12.

3. Program VOLTAGE (Pin-9) and OVP (Pin-3) to desired limits.

4. Connect Pin-1 (ANALOG-CONTROL) to Pin-6 to enable remote control.

Programming of OVP:

1. Set SETUP switch Position-6 to OFF for 0–5 VDC range or ON for 0–10 VDC range.

2. Connect the external programming voltage source positive to Pin-3 and negative to Pin-12.

3. Program VOLTAGE (Pin-9) and CURRENT (Pin-10) to desired limits.

4. Connect Pin-1 (ANALOG-CONTROL) to Pin-6 to enable remote control.

NOTE: For all resistance programming, you must program the other two parameters to desired limit values. This is mandatory for the power supply to work properly. All resistance programming uses a 0–5 kΩ external resistance.

Programming Output Voltage:

1. Set SETUP switch Position-8 to OFF (for 0–5 VDC programming range).

2. Connect the external programming resistance (0–5 kΩ) between Pin-20 and Pin-21.

3. Connect a jumper from Pin-21 to Pin-9.

4. Program CURRENT (Pin-10) and OVP (Pin-3) to desired limits.

5. Connect Pin-1 (ANALOG-CONTROL) to Pin-6 to enable remote control.

Programming Output Current:

1. Set SETUP switch Position-7 to OFF (for 0–5 VDC programming range).

2. Connect the external programming resistance (0–5 kΩ) between Pin-23 and Pin-22.

3. Connect a jumper from Pin-22 to Pin-10.

4. Program VOLTAGE (Pin-9) and OVP (Pin-3) to desired limits.

5. Connect Pin-1 (ANALOG-CONTROL) to Pin-6 to enable remote control.

Programming of OVP:

1. Set SETUP switch Position-6 to OFF (for 0–5 VDC programming range).

2. Connect the external programming resistance (0–5 kΩ) between Pin-17 and Pin-16.

3. Connect a jumper from Pin-16 to Pin-3.

4. Program VOLTAGE (Pin-9) and CURRENT (Pin-10) to desired limits.

5. Connect Pin-1 (ANALOG-CONTROL) to Pin-6 to enable remote control.

The EXTERNAL-OFF input provides the same functionality as the front panel OUTPUT switch. When asserted, it turns off the output converter, discharges output capacitors, and resets OVP/FAULT monitors. It is opto-isolated from other signals of the REMOTE ANALOG INTERFACE.

CAUTION: The maximum float potential of either line of the EXTERNAL-OFF control signal with respect to any other signal of the REMOTE ANALOG INTERFACE is 60V(PK).

With an External Voltage Source:

Assert EXTERNAL-OFF by applying a voltage of 2–30 VDC from Pin-14 (positive) to Pin-2 (return) of the REMOTE ANALOG INTERFACE connector. The voltage source and switch can be replaced with a logic gate for digital ON/OFF control.

With the Auxiliary 5 VDC Output:

The internal AUXILIARY 5 VDC OUTPUT can be used as the voltage source. Connect a switch between Pin-15 (Aux 5VDC Out) and Pin-14 (EXT-OFF In). Because the 5 VDC source is referenced to the other analog interface signals, opto-isolation is lost. The external contacts must then provide the isolation between the external control circuits and the power supply.

You can remotely monitor both analog (voltage, current) and digital (operational status) signals.

Remote Analog Monitoring:

Analog signals are available for monitoring output voltage and current. These signals are proportional to the output parameters, with user-selectable ranges of 0–5 VDC or 0–10 VDC for a zero to full-scale output change. Configure monitoring using the rear panel SETUP switch and REMOTE ANALOG INTERFACE connector:

Remote Digital Status Signals:

Digital signals are available for monitoring the operational status of the unit. The characteristics are as follows:

If the power supply appears to be operating improperly, first determine if the issue is with the supply, the load, or external control circuits. Configure the unit for basic front panel operation and perform the Initial Functional Tests (Section 3.3) to isolate the problem. The following table provides checks for common symptoms.

Because the unit uses forced convection cooling, dust can be pulled in. In dusty environments, periodic cleaning may be required. To clean the exterior of the unit, use a mild solution of detergent and water. Apply the solution with a soft cloth; do not apply it directly to the unit’s surface. To prevent damage to materials, do not use aromatic hydrocarbons or chlorinated solvents for cleaning.

WARNING: Calibration procedures are performed with the top cover removed and power on. Potentially lethal voltages exist in the power circuits and the output. Use insulated tools when making adjustments and do not touch any components or circuits.

Allow the unit to warm up for 30 minutes at no load before performing calibration. There is some interaction between offset and range adjustments; perform offset adjustments first. Several iterations may be needed.

Internal Reference Adjustment:

1. Connect a voltmeter from J14-4 (positive) to J14-6 (negative).

2. Adjust potentiometer R379 for a voltmeter reading of –5.000 VDC.

Output Voltage Offset Adjustment:

1. Connect a voltmeter across the output terminals.

2. Jumper Pin-1 to Pin-6 of the REMOTE ANALOG INTERFACE to enable remote control.

3. Jumper Pin-15 to Pin-10 and Pin-3 to program current and OVP to full scale.

4. Connect a voltage source, set to 0.050 VDC, from Pin-9 to Pin-12.

5. Adjust potentiometer R377 on the Main PWA for a reading on the external voltmeter of 1% of full scale output voltage.

6. Iterate with the range adjustment until both are accurate.

Output Voltage Range Adjustment:

1. Follow steps 1-3 from the offset procedure.

2. Connect a voltage source, set to 5.00 VDC, from Pin-9 to Pin-12.

3. Adjust potentiometer R378 on the Main PWA for a reading on the external voltmeter of 100% of full scale output voltage.

4. Iterate with the offset adjustment until both are accurate.

Output Current Offset Adjustment:

1. Connect a DC shunt across the output terminals.

2. Jumper Pin-1 to Pin-6 of the REMOTE ANALOG INTERFACE to enable remote control.

3. Jumper Pin-15 to Pin-9 and Pin-3 to program voltage and OVP to full scale.

4. Connect a voltage source, set to 0.050 VDC, from Pin-10 to Pin-12.

5. Adjust potentiometer R375 on the Main PWA for a current through the shunt of 1% of full scale output current.

6. Iterate with the range adjustment until both are accurate.

Output Current Range Adjustment:

1. Follow steps 1-3 from the offset procedure.

2. Connect a voltage source, set to 5.00 VDC, from Pin-10 to Pin-12.

3. Adjust potentiometer R376 on the Main PWA for a current through the shunt of 100% of full scale output current.

4. Iterate with the offset adjustment until both are accurate.

Voltage Display Adjustment:

1. Connect a voltmeter across the output terminals.

2. Adjust front panel CURRENT and OVP controls fully clockwise.

3. Turn the OUTPUT switch on.

4. Adjust the front panel VOLTAGE control for an output voltage equal to 100% of full scale.

5. Adjust potentiometer R13 on the Display PWA for a VOLTAGE display of 100% of full scale.

Current Display Adjustment:

1. Connect a DC shunt across the output terminals.

2. Adjust front panel VOLTAGE and OVP controls fully clockwise.

3. Turn the OUTPUT switch on.

4. Adjust the front panel CURRENT control for an output current equal to 100% of full scale.

5. Adjust potentiometer R15 on the Display PWA for a CURRENT display of 100% of full scale.