AMETEK SORENSEN DLM 8-75 (01) PDF Document

The safety symbols on the AMETEK SORENSEN DLM 8-75 are as follows:

WARNING, Risk of Electrical Shock: Indicates a potential hazard from electrical shock.

CAUTION, Refer to Accompanying Documents: Indicates that the user should consult the documentation for important information.

Off (Supply): Indicates the power supply is off.

Standby (Supply): Indicates the power supply is in standby mode.

On (Supply): Indicates the power supply is on.

Protective Conductor Terminal: Indicates the terminal for the protective earth ground.

Fuse: Indicates the location of a fuse.

Direct Current (DC): Represents direct current.

Alternating Current (AC): Represents alternating current.

Three-Phase Alternating Current: Represents three-phase AC power.

Earth (Ground) Terminal: Indicates an earth ground terminal.

Chassis Ground: Indicates a connection to the chassis.

The AMETEK SORENSEN DLM 8-75 power supply has the following features:

• High power density, 600W, in a 1U half-rack size

• Appropriate for rack or benchtop applications

• Fast dynamic response: 500µs, maximum for 50% load steps

• Low ripple and noise: as low as 3.5 mV(RMS) and 35 mV(PK-PK)

• Universal auto-ranging AC input: 90-132V or 180-264V, without user setup

• Master/slave paralleling with simple unit-to-unit control interface cable

• Flexible rack mounting allowing units to be stacked in 1U increments without requiring clearance gaps between units or slides

• Side-by-side mounting of two units in a 19″ rack

• Fast response to programming changes with active downprogrammer

• Constant-voltage and constant-current modes of operation with automatic crossover and mode indicators

• Two 3.5 digit displays for output voltage, current, and OVP

• High resolution front panel controls for voltage and current (10-turn potentiometers), and OVP (20-turn trimmer potentiometer)

• Preview switches for output voltage, current, and OVP to set parameters without disrupting load connections

• Front panel OUTPUT switch for on/off control of output power

• Remote sensing to compensate for voltage drop of power leads

• User selectable ranges of 0-5 VDC and 0-10 VDC for programming and monitoring of output voltage and current, and for programming OVP

• SETUP switch for selecting ranges for programming and monitoring signals

• Opto-isolated remote shutdown for control of output power

• Front panel LOCAL/REMOTE switch for selecting programming source

• LOCAL-LOCKOUT function to disable front panel control while in remote operation

• Digital I/O for remote control and status annunciation

• Configuration changes without requiring removal of covers

• Optional GPIB, LXI™ Class C Ethernet Interface, RS-232, and isolated remote analog control

• Cooling fan speed control for low noise and extended fan life

Notes:

1. Warranted over a temperature range of 0–50 °C, with remote sensing at output terminals.

2. AC input voltage variation within the allowed range, with constant load and temperature.

3. For 0–100% load variation, with constant nominal AC input voltage and temperature.

4. Maximum drift over 8 hours with constant line, load, temperature, after 30 min. warm-up.

5. Change in output per °C change in ambient temperature, with constant line and load.

6. Line drop subtracts from the maximum available output voltage at full rated power.

General Characteristics:

• AC Input Voltage Range: 90–132 VAC or 180–264 VAC; auto-ranging, no user setup required; single-phase, 2–wire plus ground

• AC Input Frequency Range: 47–63 Hz

• AC Input Current: 11A, maximum at 115 VAC; 6A, maximum at 230 VAC

• Operating Temperature Range: 0°C to 50°C

• Storage Temperature Range: -40°C to 65°C

• Altitude: 2,000m (6,562 ft)

• Transient Response: The output voltage will recover within 500 µs to the steady-state voltage level (within 0.1% of full scale) for a 50–100% or 100–50% load step change.

• Float Voltage: 300V(PK), maximum float voltage of either output terminal to chassis ground

Mechanical Characteristics:

• Dimensions: 8.5 in (216 mm) W x 1.75 in (44.5 mm) H x 17 in (432 mm) D, excluding protrusion of rear panel connectors, bus bars, or terminal block.

• Maximum Depth: 18.12 in (460 mm) for low-voltage models, including bus bar cover.

• Net Weight: 9.7 lbs (4.4 kg)

• Shipping Weight: 12.7 lbs (5.8 kg)

• Cooling: Forced convection cooling with internal fan. Air intake is at the front and sides; exhaust is at the rear and sides.

Input/Output Terminations:

• Output Terminations: Bus bars with #10-32 screws.

• AC Input Connector: IEC 320 male connector.

• Ground Stud: #6-32 stud on the rear panel for terminations to chassis ground.

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

2. After removing the unit from the container, perform a visual inspection of the unit itself. Check for damage such as dents, scratches, enclosure distortion, or damaged controls.

3. If any damage is found, contact the carrier immediately to file a claim for concealed damage. Save the shipping container and filler material for inspection.

Follow these steps to install a single AMETEK SORENSEN DLM 8-75 into a rack using the Rack Mount Kit (Sorensen part number DLMRK):

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

2. Remove the four 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 hand side of the rack.

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

5. Install the Single-Unit Rack Mount Bracket on the opposite side from the Rack Mount Extruded Ear using two 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 two remaining existing truss head screws.

7. Position one of the two Chassis Rack Mount Brackets on the chassis side of the rack. Use one of the two Right Angle Adapter Brackets if required 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 front panel mounting screws is installed.

Follow these steps to install two AMETEK SORENSEN DLM 8-75 units in a rack using the Rack Mount Kit (Sorensen part number DLMRK):

1. On both units, remove the four rubber feet and mounting hardware from the bottom and discard them.

2. On both units, remove the four truss head screws (two on each side) from the front side panels. Do not discard these screws.

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

4. Install the Rack Mount Extruded Ears on the outer front sides of each unit using the existing four truss head screws you removed earlier.

5. Position the two Chassis Rack Mount Brackets in the rack. Use the two Right Angle Adapter Brackets if required to match existing vertical rack rail positions.

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

The AMETEK SORENSEN DLM 8-75 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.

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

When connecting a load to the AMETEK SORENSEN DLM 8-75, consider the following:

• Wire Current Carrying Capacity: Load wiring must have a capacity greater than the power supply’s output current rating to prevent damage if the load is shorted.

• Wire Voltage Drop: Select a wire gauge that maintains an acceptable total voltage drop for the entire length of the positive and negative load lines under maximum peak current.

• Noise and Impedance Effects: To minimize noise, load wires and remote sense wires should be a twisted-pair with minimum length. Shielding may be necessary in high-noise environments. Twisting the load wires also reduces parasitic inductance, improving dynamic response at the load.

The following table provides data for various wire gauges:

The AMETEK SORENSEN DLM 8-75 offers two methods for sensing the load voltage:

Local Sensing:

This is the default factory setting. It measures the voltage internally at the rear panel output terminals. To select local sensing, ensure that REM SNS on the SETUP switch (Position-1) is set to OFF.

Remote Sensing:

Remote sensing is used to compensate for voltage drop across the load wires by measuring the voltage directly at the load. To select remote sensing, set REM SNS on the SETUP switch (Position-1) to ON. A separate pair of twisted wires (at least AWG #22) must be connected from the REMOTE SENSE (REM SNS) connector to the positive and negative terminals of the load. If remote sensing is enabled but the sense wires are not connected, the unit will shut down due to OVP.

The pinout for the REMOTE SENSE (REM SNS) connector is:

Up to four AMETEK SORENSEN DLM 8-75 units can be connected in parallel in a master/slave configuration. Follow these setup steps:

1. Connect the outputs of the units in parallel at the rear panel output terminals using short cable lengths. 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). Either of the two rear panel PARALLEL I/O connectors can be used.

3. For each slave unit, turn ON the SLAVE position (Position-2) of the 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 now adjusted with 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 of the master unit will turn off all units. The OUTPUT switch of a slave unit will turn off only its output.

7. Turning off the POWER switch of any unit will result in shutdown of all units.

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

9. External control through the REMOTE-ANALOG INTERFACE and interface selections with the SETUP switch are done on the master unit.

Multiple AMETEK SORENSEN DLM 8-75 units can be connected in series to obtain a higher output voltage, within the limits of the 300V(PK) maximum float potential. The supplies are interconnected with the negative terminal of one supply connected to the positive terminal of another.

The total output voltage is the sum of the individual outputs and is derived from the main positive and negative terminals of the total string. Each supply is individually adjusted. 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.

When driving inductive loads or batteries, the AMETEK SORENSEN DLM 8-75 requires freewheeling and blocking diodes to protect it from damage caused by back-fed power and high voltage transients.

Suggested Procedure for Diode Selection:

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

• Continuous Forward Current: The rating should be a minimum of 1.5 times the power supply’s maximum output current.

A heatsink may be required for the diode. Higher voltage rated parts may be needed depending on the load circuit design and inductor values.

Displays & Controls:

1. VOLTAGE Display: 3.5 digit LED display for output voltage or programmed OVP setting (when OVP PREVIEW is pressed).

2. CURRENT Display: 3.5 digit LED display for output current or programmed current setting (when V/I PREVIEW is pressed).

3. VOLTAGE Control: 10-Turn potentiometer for adjusting output voltage.

4. CURRENT Control: 10-Turn potentiometer for adjusting output current.

5. OVP SET Control: 20-Turn trimmer potentiometer for adjusting overvoltage protection.

Switches:

6. POWER Switch: Push-on/Push-off switch to turn the unit on and off.

7. OUTPUT Switch: Push-on/Push-off switch to turn the output on and off.

8. V/I PREVIEW Switch: Momentary push-button to preview programmed settings of output voltage and current.

9. OVP PREVIEW Switch: Momentary push-button to preview the programmed OVP setting.

10. LOCAL(REMOTE) Switch: Momentary push-button for selecting local front-panel control or remote analog/GPIB programming.

Indicators (LEDs):

11. REM (Remote) Indicator: Green LED lights when in remote programming mode.

12. OUTPUT Indicator: Green LED lights when the DC output is enabled.

13. VOLTAGE Indicator: Green LED lights for constant-voltage mode.

14. CURRENT Indicator: Green LED lights for constant-current mode.

15. OVP (Overvoltage Protection) Indicator: Red LED lights for tripped OVP.

16. FAULT Indicator: Red LED lights for overtemperature shutdown or summary fault.

17. EXT OFF (External Off) Indicator: Green LED lights when the output is turned off via a remote shutdown signal.

Power-On Check:

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

2. Ensure no connections are made to the REMOTE ANALOG INTERFACE connector and all positions of the SETUP switch are OFF (switches 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 power source.

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

7. After power-up, ensure both digital displays are on and indicate zero. The OVP, FAULT, EXT-OFF, REM, and OUTPUT indicators 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 the VOLTAGE control fully counter-clockwise.

4. Turn the CURRENT control fully clockwise.

5. Turn POWER and OUTPUT switches ON.

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

7. Compare the DVM and display readings to verify accuracy.

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

Constant-Current Mode Operation Check:

1. Ensure POWER and OUTPUT switches are OFF.

2. Connect a DC shunt across the output terminals (ensure shunt and wire ratings are sufficient).

3. Connect a DVM across the DC shunt.

4. Turn the CURRENT control fully counter-clockwise.

5. Turn the VOLTAGE control fully clockwise.

6. Turn POWER and OUTPUT switches ON.

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

Adjustment of Constant-Voltage Operation:

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

2. Press the V/I PREVIEW switch. 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.

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

Adjustment of Constant-Current Operation:

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

2. Press the V/I PREVIEW switch. 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.

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

Adjustment of OVP Threshold:

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

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

3. Press the OVP PREVIEW switch and use the OVP SET control to adjust the OVP threshold. Ensure the OVP setting exceeds the output voltage setting, otherwise the OVP will trip immediately.

Resetting OVP:

If the OVP monitor has been activated, perform the following to reset it:

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

2. Ensure the connections for the power and sense leads are correct.

3. Toggle OFF and then back ON either the OUTPUT switch, the POWER switch, or the EXTERNAL-OFF signal of the REMOTE ANALOG INTERFACE.

When using the AMETEK SORENSEN DLM 8-75 to charge a battery, take the following precautions:

1. Connect an isolation diode in series with one of the output terminals of the power supply. This prevents the battery from discharging back into the supply if it 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. This can be done using the V/I PREVIEW switch or with the supply disconnected from the battery. Compensate for the voltage drop of the isolation diode if using local sensing.

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

The supply will initially operate in constant-current mode. As the battery charges, its voltage will increase until it reaches the set float voltage. The supply will then enter constant-voltage mode, and the battery current will decrease as it becomes fully charged.

The SETUP switch is an eight-section switch on the rear panel that configures various functions of the AMETEK SORENSEN DLM 8-75. The factory default setting is all positions OFF (down).

• REM SNS (Position-1): Selects between internal (local) or external (remote) voltage sense feedback.

• SLAVE (Position-2): Configures the unit for slave operation in a parallel setup.

• IMON, 10V-Select (Position-4): Selects the voltage range (0-5V or 0-10V) for the remote current monitor readback.

• VMON, 10V-Select (Position-5): Selects the voltage range (0-5V or 0-10V) for the remote voltage monitor readback.

• OVP, 10V-Select (Position-6): Selects the voltage range (0-5V or 0-10V) for remote OVP programming.

• I, 10V-Select (Position-7): Selects the voltage range (0-5V or 0-10V) for remote current programming.

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

The REMOTE ANALOG INTERFACE connector is a 25-position female subminiature-D type. Its pinout is as follows:

Remote programming of output voltage, current, and OVP can be done using external voltage sources or resistances via the REMOTE ANALOG INTERFACE connector. The front panel LOCAL/REMOTE switch allows toggling between front-panel and remote control. The following table shows the remote control operation options:

Voltage-Source Programming of Output Voltage:

1. Set SETUP switch Position-8 for 0-5 VDC (OFF) or 0-10 VDC (ON) programming range.

2. Connect the external voltage source to Pin-9 (+) and Pin-12 (-).

3. Program the other parameters (Current and OVP) to their desired limit values.

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

Resistance Programming of Output Voltage:

1. Set SETUP switch Position-8 to OFF for 0-5 kΩ range.

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

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

4. Program the other parameters (Current and OVP) to their desired limit values.

5. Connect Pin-1 to Pin-6 to enable remote control.

Procedures for programming Output Current and OVP are similar, using their respective pins and SETUP switch positions as detailed in the user manual.

If your AMETEK SORENSEN DLM 8-75 appears to be operating improperly, use the following troubleshooting guide:

Cleaning:

The exterior of the unit should be cleaned with a mild solution of detergent and water. Apply the solution with a soft cloth, not directly to the unit’s surface. Do not use aromatic hydrocarbons or chlorinated solvents for cleaning to prevent damage.

Calibration:

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

Allow the unit to warm up for 30 minutes at no load before calibration. The following are summarized procedures:

• Internal Reference Adjustment: Connect a voltmeter to J14-4 (+) and J14-6 (-). Adjust potentiometer R379 for a reading of –5.000 VDC.

• Output Voltage Offset Adjustment: Using remote control, apply a 0.050 VDC programming signal. Adjust potentiometer R377 for a reading on an external voltmeter of 1% of full scale output voltage.

• Output Voltage Range Adjustment: Using remote control, apply a 5.00 VDC programming signal. Adjust potentiometer R378 for a reading on an external voltmeter of 100% of full scale output voltage. Iterate with the offset adjustment until both are accurate.

• Output Current Offset Adjustment: Using remote control, apply a 0.050 VDC programming signal to the current programming input. Adjust potentiometer R375 for a current through an external shunt of 1% of full scale output current.

• Output Current Range Adjustment: Using remote control, apply a 5.00 VDC programming signal to the current programming input. Adjust potentiometer R376 for a current through an external shunt of 100% of full scale output current. Iterate with the offset adjustment until both are accurate.

• Voltage Display Adjustment: Adjust the front panel VOLTAGE control for an output of 100% of full scale. Adjust potentiometer R13 on the Display PWA for a display reading of 100% of full scale.

• Current Display Adjustment: Adjust the front panel CURRENT control for an output current of 100% of full scale. Adjust potentiometer R15 on the Display PWA for a display reading of 100% of full scale.