AMETEK SORENSEN DLM 20-30 (01) PDF Document

The safety symbols on the AMETEK SORENSEN DLM 20-30 are as follows:

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

CAUTION, Refer to Accompanying Documents: Indicates that you should refer to the manual for important information.

Off (Supply): Represents the power off state.

Standby (Supply): Represents the standby power state.

On (Supply): Represents the power on state.

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.

Earth (Ground) Terminal: Indicates a ground terminal.

Chassis Ground: Indicates a connection to the chassis ground.

When you first receive your AMETEK SORENSEN DLM 20-30, you should inspect it to ensure no shipping damage has occurred.

1. Perform a visual inspection of the shipping container before accepting the package. 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 for shipping damage like dents, scratches, enclosure distortion, or damaged controls. If external damage is found, there may be internal damage as well.

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

The AMETEK SORENSEN DLM 20-30 is designed for both rackmount and benchtop use. Since the units are fan-cooled, they require adequate clearance at the air intake and exhaust so that air flow 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 air intake should not exceed 50°C.

To install a single AMETEK SORENSEN DLM 20-30 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 Rack Mount 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 other two (2) 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 (2) 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.

To install two AMETEK SORENSEN DLM 20-30 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 on 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 for each unit.

5. Position the two Chassis Rack Mount Brackets in the rack. Use the two (2) 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 20-30 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.

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 with the unit has a safety ground wire that connects the enclosure of the unit to the safety ground of the AC power source. This connection is automatically made when the power cord is plugged into an appropriate AC receptacle.

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 20-30, consider the following:

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

Connections: Low-voltage models (5V–60V) have bus bars at the rear for connecting the load. High-voltage models (80V–300V) have an output terminal block with a snap-on cover. Ensure the cover is properly installed before applying power.

Wire Gauge: Select a suitable wire gauge based on:

1. Current Carrying Capacity: Load wiring must have a capacity greater than the output current rating of the power supply. This ensures the wiring won’t be damaged if the load is shorted.

2. Voltage Drop: The wire gauge must be selected to maintain an acceptable total voltage drop of the load wiring under the maximum peak current.

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

The following table provides wire data for current rating and resistance:

The AMETEK SORENSEN DLM 20-30 offers two methods for sensing load voltage: local and remote.

Local Sensing:

This is the default factory setting. It measures the output 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:

This method 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.

Connect a separate pair of twisted wires (at least AWG #22) from the REMOTE SENSE (REM SNS) connector to the respective positive and negative terminals of the load. In high-noise environments, shielded wires may be required. If remote sensing is enabled but the sense wires are not connected to the output, the power supply will shut down due to OVP.

The REMOTE SENSE (REM SNS) connector pinout is:

Up to four AMETEK SORENSEN DLM 20-30 power supplies of the same model can be connected in parallel for greater output current or power. The setup uses a master/slave configuration where the master controls the output voltage and total current. The master and slave units share the output current equally.

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 the slave units, select slave mode by turning 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 the slave units to full scale.

5. The voltage, current, and OVP for the entire parallel setup are 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 the shutdown of all units.

9. External control and interface selections are done with the master unit.

The PARALLEL I/O connector pinout is as follows:

Multiple AMETEK SORENSEN DLM 20-30 units of the same model 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 being connected 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.

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 20-30 requires freewheeling and blocking diodes when driving inductive loads or batteries. This is to protect the power supply from damage caused by power being fed back into the supply and from high voltage transients.

Suggested Procedure for Diode Selection:

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

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

3. Heatsink: A heatsink may be required for the diode.

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

The controls and indicators on the AMETEK SORENSEN DLM 20-30 are as follows:

Front Panel:

1. VOLTAGE Display: 3.5 digit LED display that normally indicates output voltage. Also shows programmed voltage setting during V/I PREVIEW or OVP setting during OVP PREVIEW.

2. CURRENT Display: 3.5 digit LED display that normally indicates output current. Also shows programmed current setting during V/I PREVIEW.

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.

6. POWER Switch: Push-on/Push-off switch for turning the unit on and off.

7. OUTPUT Switch: Push-on/Push-off switch for turning the output on and off.

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

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

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

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 operation.

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

15. OVP Indicator: Red LED lights for tripped OVP; output is also turned off.

16. FAULT Indicator: Red LED lights for overtemperature shutdown or summary fault; output is also turned off.

17. EXT OFF Indicator: Green LED lights when the output is turned off using a remote shutdown signal.

Rear Panel:

18. AC Line Input: IEC connector for the AC power cord.

19. POSITIVE DC Output: Bus bar (#10-32 screw) for low-voltage models.

20. NEGATIVE DC Output: Bus bar (#10-32 screw) for low-voltage models.

21. ANALOG INTERFACE Connector: Connector for remote analog programming, monitoring, and digital I/O.

22. REMOTE SENSE (REM SNS) Connector: Connector for remote voltage sensing connections.

23. PARALLEL I/O Connector: Two connectors for configuring parallel operation.

24. SETUP Switch: Eight-section switch for selecting remote sensing, slave unit, and programming/monitoring voltage ranges.

25. Ground Stud: #6-32 stud for chassis ground connection.

26. POSITIVE DC Output: Terminal block (#6-32 screw) for high-voltage models.

27. NEGATIVE DC Output: Terminal block (#6-32 screw) for high-voltage models.

To ensure your AMETEK SORENSEN DLM 20-30 is functioning correctly, perform the following checks:

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 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 POWER switch ON (button in). The supply will run a 7-second power-up routine: all LEDs on, all display segments on, fans at max speed, OVP/FAULT monitors 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 the 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 the shunt and wires can handle the supply’s full current.

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 the DVM across the full range.

The AMETEK SORENSEN DLM 20-30 automatically crosses over between Constant-Voltage (CV) and Constant-Current (CC) modes depending on the load resistance and the VOLTAGE and CURRENT settings.

Adjustment for Constant-Voltage Operation:

This mode is used when you want the output voltage to remain constant while the load current varies.

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

2. Press the V/I PREVIEW switch. Adjust the VOLTAGE control to your desired output voltage. Adjust the CURRENT control to a value greater than the maximum peak current your load will require.

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

Adjustment for Constant-Current Operation:

This mode is used when you want the output current to remain constant while the load voltage varies.

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

2. Press the V/I PREVIEW switch. Adjust the CURRENT control to your desired output current. Adjust the VOLTAGE control to a value greater than the maximum peak voltage your load will require.

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

The Overvoltage Protection (OVP) feature protects the load from overvoltage conditions. When tripped, the output is turned off and the OVP indicator lights up.

Adjusting the 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 to display the OVP threshold setting. Adjust the OVP SET control. Ensure the OVP setting exceeds the setting of the output voltage; otherwise, the OVP will be tripped as soon as the POWER switch is turned ON.

Resetting a Tripped OVP:

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

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

When using the AMETEK SORENSEN DLM 20-30 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. You can do this using the V/I PREVIEW switch or with the supply disconnected from the battery. The VOLTAGE setting should compensate for the voltage drop of the isolation diode if local sensing is used.

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

When charging, the supply will initially operate in constant-current mode. As the battery charges, its voltage increases until the float voltage setting is reached. The supply then enters constant-voltage mode, and the battery current will decrease until it drops to a low float current level when the battery is fully charged.

The rear panel SETUP switch on the AMETEK SORENSEN DLM 20-30 is an eight-section switch that configures the power supply for various user requirements. The factory default is all positions OFF (down).

REM SNS (Pos-1): Selects between internal voltage sense (OFF) and external remote sense (ON).

SLAVE (Pos-2): Configures the unit for slave operation in a parallel setup (ON) or as a master/standalone unit (OFF).

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

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

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

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

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

The REMOTE ANALOG INTERFACE on the AMETEK SORENSEN DLM 20-30 is a 25-position female subminiature-D connector used for remote control and monitoring. The pinout is as follows:

The AMETEK SORENSEN DLM 20-30 can be remotely programmed for output voltage, current, and OVP using either external voltage sources or resistances via the REMOTE ANALOG INTERFACE. When remote programming is enabled, front panel control is disabled for all parameters, so all three must be set remotely.

You can toggle between front-panel and remote control using the LOCAL/REMOTE switch. The REM indicator will be on when remote control is enabled. The LOCAL-LOCKOUT digital control signal can be used to disable the switch and keep the supply in remote control.

The remote control operation options are:

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. Also, ensure the unit is unplugged from AC input before changing remote interface connections or SETUP switch settings.

If your AMETEK SORENSEN DLM 20-30 appears to be operating improperly, use the following table to diagnose and resolve common issues.

The AMETEK SORENSEN DLM 20-30 has no user-replaceable fuses. Internal fuses are sized for fault isolation and should only be checked and replaced by qualified technical personnel. The ratings are as follows:

Because the AMETEK SORENSEN DLM 20-30 uses forced convection cooling, dust can accumulate inside. In environments with high dust concentrations, periodic cleaning may be required. To clean the exterior, 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 power supply top cover removed and the power on. Potentially lethal voltages exist in the power circuits and the output of high voltage models. Use insulated tools and do not touch any components or circuits.

Allow the unit to warm up for 30 minutes at no load before performing calibration. Perform offset adjustments before range adjustments.

Internal Reference Adjustment (R379):

1. Connect a voltmeter from J14-4 (positive) to J14-6 (negative) on the Main PWA.

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

Output Voltage Offset Adjustment (R377):

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 output 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 (R378):

1. Connect a voltmeter across the output terminals.

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

3. Jumper Pin-15 to Pin-10 and Pin-3.

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

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

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

Output Current Offset Adjustment (R375):

1. Connect a DC shunt across the output terminals.

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

3. Jumper Pin-15 to Pin-9 and Pin-3 to program output 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 (R376):

1. Connect a DC shunt across the output terminals.

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

3. Jumper Pin-15 to Pin-9 and Pin-3.

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

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

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

Voltage Display Adjustment (R13):

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 (R15):

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.