Delta D750 User manual

D750
DC Power Supply
User Manual
www.deltaww.com

User Manual
D750
DC Power Supply
Guarantee....................................................................................................................................................... 1
Safety Instructions ........................................................................................................................................ 3
Chapter1 General Information...................................................................................................................... 5
1.1 User Manual Content ........................................................................................................................... 5
1.2 Introduction .......................................................................................................................................... 5
1.2.1 General description ..................................................................................................................... 5
1.2.2 Features and options................................................................................................................... 5
1.2.3 Multiple output power system ..................................................................................................... 6
1.2.4 Control via the serial communication port ................................................................................... 6
1.2.5 Analog voltage programming and monitoring ............................................................................. 6
1.2.6 Parallel operation ........................................................................................................................ 6
1.2.7 Output connections...................................................................................................................... 6
1.2.8 Cooling and mechanical construction ......................................................................................... 7
1.3 Specification ......................................................................................................................................... 7
1.4 Supplemental Characteristics ............................................................................................................ 12
1.5 D750 A Power Supplies Outline Drawings.......................................................................................... 12
Chapter2 Installation................................................................................................................................... 13
2.1 General .............................................................................................................................................. 13
2.2 Preparation For Use .......................................................................................................................... 13
2.3 Initial Inspection ................................................................................................................................. 13
2.4 Location, Mounting And Cooling ........................................................................................................ 14
2.5 AC Source Requirements .................................................................................................................. 14
2.6 AC Input Power Connection ............................................................................................................... 14
2.6.1 AC Input Connector .................................................................................................................. 14
2.6.2 AC Input Cord ........................................................................................................................... 14
2.7 Turn-on Checkout Procedure ............................................................................................................ 15
2.7.1 General ..................................................................................................................................... 15
2.7.2 Prior to Operation ...................................................................................................................... 15
2.7.3 Constant Voltage Check ........................................................................................................... 15
2.7.4 Constant Current Check ........................................................................................................... 15
2.7.5 OVP Check ............................................................................................................................... 16
2.7.6 UVL Check ................................................................................................................................ 16
2.7.7 Foldback Check ........................................................................................................................ 17
2.7.8 Address Setting ......................................................................................................................... 17
2.7.9 Baud Rate Setting ..................................................................................................................... 17

2.8 Connecting The Load ........................................................................................................................ 18
2.8.1 Load Wiring ............................................................................................................................... 18
2.8.2 Current Carrying Capacity ........................................................................................................ 18
2.8.4 Noise and Impedance Effects ................................................................................................... 20
2.8.5 Inductive loads .......................................................................................................................... 20
2.8.6 Connecting single loads, local sensing (default). ...................................................................... 20
2.8.7 Connecting single loads, remote .............................................................................................. 21
2.8.8 Connecting multiple loads, radial distribution method ............................................................... 21
2.8.9 Multiple load connection with distribution terminals................................................................... 22
2.8.10 Grounding outputs ................................................................................................................... 22
2.9 Local And Remote Sensing ............................................................................................................... 23
2.9.1 Sense wiring ............................................................................................................................. 23
2.9.2 Local sensing............................................................................................................................. 23
2.9.3 Remote sensing......................................................................................................................... 24
2.9.4 J2 sense connect or technical information ................................................................................ 25
2.10 Repackaging For Shipment ............................................................................................................. 25
Chapter 3 Local Operation.......................................................................................................................... 26
3.1 Front And Rear Panel Controls And Connectors ................................................................................ 26
3.1.1 Introduction ............................................................................................................................... 26
3.1.2 Front Panel Controls And Indicators ......................................................................................... 26
3.1.3 Front Panel Locking................................................................................................................... 28
3.1.3.1 Unlocked front panel .............................................................................................................. 28
3.1.3.2 Locked front panel .............................................................................................................. 29
3.1.4 Rear Panel ................................................................................................................................ 29
3.1.5 Auxiliary Power Supply .............................................................................................................. 30
3.1.5.1 Connector detail:.................................................................................................................. 30
3.1.5.2 Connector functions description: ......................................................................................... 30
3.1.6 Rear Panel Sw1 Setup Switch .................................................................................................. 31
3.1.6.1 SW1 position functions ........................................................................................................ 31
3.1.6.2 Resetting the SW1 switch.................................................................................................... 32
3.1.7 Rear Panel J1 Programming And Monitoring Connector .......................................................... 32
3.1.7.1 Making J1 connections ....................................................................................................... 32
3.2 Local Operation .................................................................................................................................. 35
3.2.1 Introduction ............................................................................................................................... 35
3.2.2 Standard Operation .................................................................................................................. 35
3.2.2.1 Constant Voltage Mode ...................................................................................................... 35
3.2.2.2 Constant Current Operation................................................................................................. 36
3.2.2.3 Automatic Crossover ........................................................................................................... 37

3.2.3 Over Voltage Protection (OVP).................................................................................................. 37
3.2.3.1 Setting the OVP level........................................................................................................... 37
3.2.3.2 Activated OVP protection indications .................................................................................. 37
3.2.3.3 Resetting the OVP circuit .................................................................................................... 37
3.2.4 Under Voltage Limit (UVL)......................................................................................................... 38
3.2.4.1 Setting the UVL level ........................................................................................................... 38
3.2.5 Foldback Protection .................................................................................................................. 38
3.2.5.1 Setting the Foldback protection .......................................................................................... 38
3.2.5.2 Resetting activated Foldback protection ............................................................................. 39
3.2.6 Output On/Off Control ............................................................................................................... 39
3.2.7 Output Shut-Off (SO) Control Via Rear Panel J1 Connector .................................................... 39
3.2.8 Enable/Disable Control Via Rear Panel J1 Connector .............................................................. 40
3.2.9 CV/CC Signal ............................................................................................................................ 41
3.2.10 Ps_Ok Signal........................................................................................................................... 41
3.2.11 Safe Start And Auto-Restart Modes ......................................................................................... 41
3.2.11.1 Automatic start mode (AU7)............................................................................................... 41
3.2.11.2 Safe start mode (SAF) ....................................................................................................... 42
3.2.12 Over Temperature Protection (OTP)........................................................................................ 42
3.3 Last Setting Memory........................................................................................................................... 42
3.4 Remote Operation .............................................................................................................................. 43
3.4.1 Series Operation........................................................................................................................ 43
3.4.1.1 Series connection for increased output voltage................................................................... 43
3.4.1.2 Series connection for positive and negative output voltage................................................. 44
3.4.2 Parallel Operation...................................................................................................................... 45
3.4.2.1 Basic parallel operation ...................................................................................................... 45
3.4.2.2 Advanced parallel operation ............................................................................................... 46
3.4.3 Daisy-Chain Connection ........................................................................................................... 49
Chapter 4 Remote Operation...................................................................................................................... 50
4.1 Remote Analog Programming ............................................................................................................ 50
4.1.1 Introduction ............................................................................................................................... 50
4.1.2 Local /Remote Analog Control................................................................................................... 50
4.1.3 Local /Remote Analog Indication ............................................................................................... 50
4.1.4 Remote Voltage Programming Of Output Voltage And Current Limit ........................................ 51
4.1.5 Resistive Programming Of Output Voltage And Current Limit ................................................... 52
4.1.6 Remote Monitoring Of Output Voltage And Current .................................................................. 53

4.2 RS232 & RS485 Remote Control ....................................................................................................... 55
4.2.1 Introduction................................................................................................................................ 55
4.2.2 Configuration ............................................................................................................................. 55
4.2.2.1 Default setting...................................................................................................................... 55
4.2.2.2 Address setting .................................................................................................................... 55
4.2.2.3 RS232 or RS485 selection ................................................................................................. 56
4.2.2.4 Baud rate setting ................................................................................................................. 56
4.2.2.5 Setting the unit into Remote or Local mode......................................................................... 56
4.2.2.6 RS232/485 port in Local mode ............................................................................................ 56
4.2.3 Rear Panel RS232/485 Connector ............................................................................................ 57
4.2.4 Connecting Power Supplies To RS232 Or RS485 Bus.............................................................. 57
4.2.4.1 Single power supply............................................................................................................. 57
4.2.4.2 Multi power supply connection to RS232 or RS485 bus...................................................... 59
4.2.5 Communication Interface Protocol............................................................................................. 60
4.2.5.1 Data format ......................................................................................................................... 60
4.2.5.2 Addressing ........................................................................................................................... 60
4.2.5.3 End of Message .................................................................................................................. 60
4.2.5.4 Command Repeat ............................................................................................................... 60
4.2.5.5 Acknowledge........................................................................................................................ 61
4.2.5.6 Error message .................................................................................................................... 61
4.2.5.7 Backspace .......................................................................................................................... 61
4.2.6 Error Messages ......................................................................................................................... 61
4.2.7 Command Set Description......................................................................................................... 62
4.2.7.1 General guides .................................................................................................................... 62
4.2.7.2 Command set categories .................................................................................................... 62
4.2.7.3 Initialization control commands............................................................................................ 62
4.2.7.4 ID control commands .......................................................................................................... 63
4.2.7.5 Output control commands ................................................................................................... 63
4.2.7.6 GPIB .................................................................................................................................... 64
4.2.7.7 Global output commands..................................................................................................... 66
4.2.8 Serial Communication Test Set-up ............................................................................................ 67
Chapter 5 Maintenance ............................................................................................................................... 69
5.1 Introduction ........................................................................................................................................ 69
5.2 Units Under Warranty ........................................................................................................................ 69
5.3 Periodic Maintenance ......................................................................................................................... 69
5.4 Adjustments And Calibration .............................................................................................................. 69
5.5 Parts Replacement And Repairs ....................................................................................................... 69
5.6 Troubleshooting ................................................................................................................................. 69

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User Manual
D750
DC Power Supply
Guarantee
THE SCOPE OF RIGHT:
1. Delta Electronics Co., Ltd. guarantees the quality of all sales of products in Taiwan, and is
responsible for fault repair, to safeguard the interests of your company.
2. When encountered fault conditions in need of services, please contact the Taiwan presence
or Delta Electronics.
3. The failure of the product you are buying, if not in the place of your original purchase, you
can use the global network service. You may contact the global Delta electronic branch,
each branch will be according to the charge system to provide product maintenance and
service.
PRODUCTS ASSURANCE THE SCOPE:
However, any one of the following items, It is not the Company's warranty. Still need
replacement and repair parts replacement and repair parts costs charged in accordance with
company policy. If because of the severe damage caused can not be repaired, the repair
services have declined:
1. Change specifications or additional items arising from the failure and damage caused by the
failure and damage, because the user (or commissioned) changes, overhaul, modification
products or attach other objects.
2. Force majeure or failure caused by improper use.
(1) Due to natural disasters to change (such as earthquake, typhoon, fire, lightning,
abnormal voltage ... etc.) and environmental factors (such as sulfur gas, chemical,
oil, rodents, pests, ... etc.) force majeure natural disaster caused by the damage or
malfunction.
(2) (External damage, such as people, animals, etc., are not used in accordance with the
provisions of the supply voltage, the error operation after installation on their own
handling ... etc.) caused by the failure or damage.
(3) Appearance because of the use of natural dirt or old.
3. Consumable parts and accessories.
4. If the following circumstances require service, without a free service:

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To exceed the Warranty Period:
(1) Use within the warranty period after the Company sent a free guide or instructions, still
can not adjust, and the request for service
(2) Ensure that the contents of the record book, and now the items are inconsistent.
ASSURANCE AND SERVICE TIME:
Regardless of guarantee after the expiry of the period or duration, the Company's maintenance
services in the basic maintenance of the award determined by the time of deduction of the
Central Personnel Administration holidays, national holidays and traditional ethnic festivals,
Monday to Friday from 9 am to afternoon five o'clock

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User Manual
D750
DC Power Supply
Safety Instructions
CAUTION
The following safety precaution must be observed during all phases of operation, service and
repair of this equipment. Failure to comply with the safety precautions or warnings in this document
violates safety standards of design, manufacture and intended use of this equipment and may
impair the built-in protections within.
Delta shall not be liable for user’s failure to comply with these requirements.
INSTALLATION CATEGORY
The D750 A has been evaluated to INSTALLATION CATEGORY II. Installation category (over
voltage category) II: local level, appliances, portable equipment etc.. With smaller transient over
voltage than Installation Category (over voltage category) III.
GROUNDING
This product is a Safety Class 1 instrument. To minimize shock hazard, the instrument chassis must
be connected to an electrical ground. The instrument must be connected to the AC power supply
mains through a three conductor power cable, with the ground wire firmly connected to an electrical
ground (safety ground) at the power outlet.
For instruments designed to be hard-wired to the supply mains, the protective earth terminal must
be connected to the safety electrical ground before another connection is made. Any interruption
of the protective ground conductor, or disconnection of the protective earth terminal will cause a
potential shock hazard that might cause personal injury.
!
CAUTION
WARNING
WARNING
OUTPUT TERMINAL GROUNDING
There is a potential shock hazard at the RS232/485 and the IEEE ports when using power supplies
with rated or combined voltage greater than 400V and the Positive Output of the Power Supply is
grounded. Do Not connect the Positive Output to ground when using the RS232/485 or IEEE.
FUSES
Fuses must be changed by authorized Delta service personnel only. For continued protection
against risk of fire, replace only with the same type and rating of fuse.
INPUT RATINGS
Do not use AC supply which exceeds the input voltage and frequency rating of this instrument. The
input voltage and frequency rating of the D750 is: 100-200V~, 50/60Hz.For safety reasons, the
mains supply voltage fluctuations should not exceed +/-10% of nominal voltage.
LIVE CIRCUITS
Operating personnel must not remove the instrument cover. No internal adjustment or component
replacement is allowed by non-Delta qualified personnel. Never replace components with power
cable connected. To avoid injuries, always disconnect power, discharge circuits and remove
external voltage source before touching components.

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PARTS SUBSTITUTIONS & MODIFICATIONS
Parts substitutions and modifications are allowed by authorized Delta service personnel only. For
repairs or modifications, the instrument must be returned to Delta service facility.
ENVIRONMENTAL CONDITIONS
The D750 safety approval applies to the following operating conditions:
*Indoor use *Ambient temperature: 0℃to 50℃
*Maximum relative humidity: 90% (no condensation) *Altitude: up to 3000m
*Pollution degree 2
!
CAUTION
WARNING
CAUTION Risk of Electrical Shock.
!
CAUTION
WARNING
Instruction manual symbol. The instrument will be marked with this symbol when it is
necessary for the user to refer to the instruction manual.
!
CAUTION
WARNING
Indicates hazardous voltage.
!
CAUTION
WARNING
Protective Ground Conductor Terminal
!
CAUTION
WARNING
Off (Supply)
!
CAUTION
WARNING
On (Supply)
!
CAUTION
WARNING
Indicates ground terminal.
!
CAUTION
WARNING
The WARNING sign denotes a hazard. An attention to a procedure is called. Not
following procedure correctly could result in personal injury.
AWARNING sign should not be skipped and all indicated conditions must be fully
understood and met.
!
CAUTION
WARNING
The CAUTION sign denotes a hazard. An attention to a procedure is called. Not
following procedure correctly could result in damage to the equipment. Do not proceed
beyond a CAUTION sign until all indicated conditions are fully understood and met.

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User Manual
D750
DC Power Supply
Chapter1 General Information
1.1 User Manual Content
This user's manual contains the operating instructions, installation instructions and
specifications of the D750 power supplies. The instructions refer to the standard power
supplies, including the built-in RS232/485/IEEE serial communication.
1.2 Introduction
1.2.1 General description
D750 high performance programmable DC power supplies. The D750 is power factor
corrected and operates from worldwide AC voltage range continuously. Output voltage and
current are continuously displayed and LED indicators show the complete operating status
of the power supply. The Front panel controls allow the user to set the output parameters,
the protection levels (Over-Voltage protection, Under-Voltage limit and Foldback) and
preview the settings. The rear panel includes the necessary connectors to control and
monitor the power supply operation by remote analog signals or by the built-in serial
communication (RS232/485). GPIB programming and Analog programming/monitoring
1.2.2 Features and options
* Constant Voltage / Constant Current with automatic crossover.
* Active Power Factor correction.
* Universal Input Voltage 85~265Vac, continuous operation.
* Embedded Microprocessor Controller.
* Built in RS232/485 Interface.
* Voltage & Current high resolution adjustment by digital encoders.
* High accuracy programming/readback-16 bit.
* Software Calibration (no internal trimmers / potentiometers).
* Last Setting Memory.
* Independent Remote ON/OFF and Remote Enable/Disable.
* Parallel operation (Master/Slave) with Active current sharing.
* Remote sensing to compensate for voltage drop of power leads.
* External Analog Programming and Monitoring standard (0-5V or 0-10V, user selectable).
* Cooling fan speed control for low noise and extended fan life.
* Zero stacking-no ventilation holes at the top and bottom surface of the power supply.
* GPIB interface (SCPI compatible).
1.2.3 Multiple output power system
D750 can be configured into a programmable power system of up to 31 units using the
built-in RS232/RS485 communication port in the power supply and the RS485 linking cable
provided with each power supply.

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In a GPIB system, each power supply can be controlled using the GPIB controller.
1.2.4 Control via the serial communication port
The following parameters can be programmed via the serial communication port:
1. Output voltage setting.
2. Output current setting.
3. Output voltage measurement.
4. Output on/off control.
5. Output current measurement.
6. Foldback protection setting.
7. Over-voltage protection setting and readback.
8. Under-Voltage limit setting and readback.
9. Power-supply start up mode (last setting or safe mode)
1.2.5 Analog voltage programming and monitoring
Analog inputs and outputs are provided at the rear panel for analog control of the power
supply. The output voltage and the current limit can be programmed by analog voltage or by
resistor, and can be monitored by analog voltage. The power supply output can be remotely
set to On or Off and analog signals monitor the proper operation of the power supply and
the mode of operation (CV/CC).
1.2.6 Parallel operation
D750 of the same output voltage and current rating can be paralleled in master-slave
configuration with automatic current sharing to increase power available.
1.2.7 Output connections
Float outputs shall not more than +/-300VDC above/below chassis ground. Contact factory
for assistance with higher float voltage applications. Local or remote sense may be used.
In remote sense, the voltage drop on the load wires should be minimized. Refer to the
specifications for the maximum voltage drop value.
1.2.8 Cooling and mechanical construction
D750 is cooled by internal fans. At the installation, care must be taken to allow free air flow
into the power supply via the front panel and out of the power supply via the rear panel.
D750 have a compact and lightweight package which allows easy installation and space
saving in the application equipment.

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1.3 Specification
OUTPUT RATING
Max. Rated output voltage(*1) 300V
Max. Rated output current(*2) 2.5A
Rated output power 750W
INPUT CHARACTERISTICS
Input voltage/freq(*3) 1-Phase, 85~265Vac continuous, 47~63Hz
Input current 10.5A (100Vac), 5A (200Vac)
Power Factor (Typ) 1-Phase: 0.98@100/200Vac, rated output
power.
Efficiency(*4) 83%(100Vac), 87%(200Vac)
Inrush current at 100/200V Less than 25A
CONSTANT VOLTAGE MODE
Max. Line regulation(*5) 0.01% of rated output voltage +2mV
Max. Load regulation(*6) 0.01% of rated output voltage +2mV
Ripple and noise (p-p , 20MHz)(*10) 150mV
Ripple r.m.s., 5Hz~1MHz(*10) 25mV
Temperature coefficient 100PPM/ºC from rated output voltage,
following 30 minutes warm-up with room
temperature.
Temperature drift 0.05% of rated Vout over 8hrs interval
following 30 minutes warm-up. Constant
line, load & temp with room temperature.
Rem. sense compensation/wire 5V
Up-prog. Response time, 0~Vomax(*9) 150ms
Down-prog. Response time: rated output
current(*8)
150ms
No load(*10) 2500ms
Transient response time Time for the output voltage to recover within
0.5% of its rated output for a load change
10~90% of rated output current. Output set-
point: 10~100%. 2ms or less
Hold-up time 20ms Typical. Rated output power.
CONSTANT CURRENT MODE
Max. Line regulation(*5) 0.01% of rated output current +2mA

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Max. Load regulation(*7) 0.02% of rated output current +5mA
Ripple r.m.s., 5Hz~1MHz(*8) 13mA
Temperature coefficient 100PPM/ ºC from rated output current,
following 30 minutes warm-up with room
temperature.
Temperature drift 0.05% of rated Iout over 8hrs interval
following 30 minutes warm-up. Constant
line, load & temp with room temperature.
Warm up drift Less than 0.1% rated output current over 30
minutes following power on or output voltage
change or load current change.
ANALOG PROGRAMMING AND MONITORING
Vout voltage programming
0~100%, 0~5V or 0~10V, user select.
Accuracy and linearity: +/-0.5% of rated Vout.
Iout voltage programming 0~100%, 0~5V or 0~10V, user select.
Accuracy and linearity: +/-1% of rated Iout.
Vout resistor programming 0~100%, 0~5/10Kohm full scale, user select.
Accuracy and linearity: +/-1% of rated Vout.
Iout resistor programming 0~100%, 0~5/10Kohm full scale, user select.
Accuracy and linearity: +/-1.5% of rated Iout.
On/off control By electrical Voltage 2~15V or open circuit,
user selectable logic.
Output current monitor 0~5V or 0~10V, user selectable.
Accuracy: +/-(1%+0.4% F.S.)
Output voltage monitor 0~5V or 0~10V, user selectable.
Accuracy :+/-(1%+0.4% F.S.)
Power supply OK signal 4~5V-OK, 0V-Fail.500ohm series resistance.
Parallel operation Possible, up to 4 units in master/slave mode
with two wire current balance connection.
Series operation Possible (with external diodes), up to 2
units. 600Vdc max. from chassis ground.
CV/CC indicator Open collector. CV: Off CC: On, Maximum
voltage: 30V sink current: 10mA.
Enable/Disable Dry contact. Open: off, Short: on. Max.
voltage at Enable/Disable in: 6V.
Local/Remote analog control Short: Remote, Open: Local.
Local/Remote analog indicator Local: Open, Remote: on

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PROGRAMMING AND READBACK (RS232/485, IEEE Interface)
Vout programming accuracy 0.05% of actual output voltage +0.05% of
rated output voltage
Iout programming accuracy 0.1% of actual output current +0.2% of rated
output current
Vout programming resolution 0.012% of full scale
Iout programming resolution 0.012% of full scale
Vout readback accuracy 0.1%+0.1% of rated output voltage
Iout readback accuracy 0.1%+0.3% of rated output current
Vout readback resolution 0.012% of full scale
Iout readback resolution 0.012% of full scale
PROTECTIVE FUNCTIONS
Foldback protection Output shut-down when power supply
change from CV to CC User presetable.
Over-voltage protection (OVP) Inverter shut-down, manual reset by AC
input recycle or by OUT button or by
communication port command.
Over-voltage trip point 5~330V
Output under voltage limit (UVL) Preset by front panel or communication port.
Prevents from adjusting Vout bellow limit.
Dose not affect analog programming.
Over temperature protection Latched
FRONT PANEL
Control functions Vout/Iout manual adjust by separate
encoders (coarse and fine adjustment).
OVP/UVL manual adjust by Vout. Adjust
encoder.
Address selection by Voltage Adjust
encoder. No of addresses: 31.
Go to local control.
Output on/off
AC on/off
Front panel Lock
Foldback control
Baud rate selection: 1200, 2400, 4800, 9600
and 19200.

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Re-start modes (automatic restart, safe
mode).
Display Vout: 4 digits, accuracy: 0.5% of rated
output voltage +/-1 count.
Iout: 4 digits, accuracy: 0.5% of rated
output current +/-1 count.
Indications VOLTAGE, CURRENT, ALARM, FINE,
PREVIEW, FOLDBACK, REMOTE (RS232,
RS485, IEEE), OUTPUT ON, FRONT
PANEL LOCK.
ENVIRONMENTAL CONDITIONS
Operating temperature 0~50 ºC, 100% load.
Storage temperature -20~70 ºC
Operating humidity 30~90% RH (no condensation).
Storage humidity 10~95% RH (no condensation).
Altitude Maximum 3000m (10000ft). Derate output
current by 2%/100m above 2000m.
Alternatively maximum ambient temperature
by 1ºC/100m above 2000m.
MECHANICAL
Cooling Forced air cooling by internal fans.
Weight 4.5kg
Dimensions (WxHxL) W: 214mm, H: 43.6mm, L: 436.7mm (Refer
to Outline drawing).
Vibration TEST CONDITIONS:
a. NON-OPERATING
b. SINUSOIDAL
c. ACCELERATION: 0.5G (5Hz), 0.94G
(10~150Hz)
d. Duration: 30 minutes for each three
axis (X, Y, Z)
Shock TEST CONDITIONS:
a. NON-OPERATING
b. HALF SINUSOIDAL
c. NUMBER OF SHOCK: 6 SHOCKS FOR
EACH DIRECTION.
d. VELOCITY CHANGE: 1.32 m/s
e. PULSE DURATION: 2ms

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SAFETY/EMC
Applicable standards: Safely
CE Mark, EN61010 listed Output is hazardous
EMC EN55011
Withstand voltage Input-Outputs (SELV): 3.0KVrms 1min,
Input-Ground: 1.5KVrms 1min.
Insulation resistance More than 100Mohm at 25 ºC, 70% RH.
Conducted emission EN 55011:2009+A1:2010, Group I, Class A
Radiated emission EN 55011:2009+A1:2010, Group I, Class A
NOTES:
*1: Minimum voltage is guaranteed to maximum 0.2% of the rated output voltage.
*2: Minimum current is guaranteed to maximum 0.4% of the rated output current.
*3: At 100-240Vac (50/60Hz) input voltage, with rate output power.
*4: 在100/200V 输入电压和最大输出功率
*5: At 85~265Vac or 170~265Vac, constant load.
*6: From No-load to Full-load, constant input voltage Measured at the sensing point in
Remote Sense.
*7: 负载电压变化范围为电源额定电压，输入电压恒定。
*8: 纹波在输出电压为 10-100％和输出下测得
*9: For load voltage change, equal to the unit voltage rating, constant input voltage.
*10: 额定电阻负载。
1.4 Supplemental Characteristics
The supplemental characteristics give typical but non-warranted performance
characteristics. The supplemental characteristics are useful in assessing applications for
the power supply. Several kinds of supplemental characteristics are listed below.
1. Evaluation Data: Typical performance of the power supply.
2. Reliability Data: Reliability performance of the power supply.
3. EN61000 Data: Performance of the power supply under EN61000 test conditions.
4. EMI Data: Typical EMI (conducted and radiated) performance of the power supply.
The supplemental characteristics data is held in each DELTA sales and service facility. For
further details please contact the DELTA office nearest you.

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D750
DC Power Supply
1.5 D750 Power Supplies Outline Drawings
CHASSIS
(L)*431.2 ±
±
2
*482.4 2
43.1
*256.1 ±1
(H)*43.6 ±1
*268.2 ±2
6
31.7
(W)*214 ±2
24.5 ±1
NOTE.3
NOTE. 1 NOTE.2
31 2 4 5 6
9 7
8
19 1012
11131416
151718
153467
2 8
31 2 4 5 6
9 7
8
19 1012
11131416
151718
NOTE :
1. Mating plug Phoenix GIC2.5/4-ST-7.62
2. Mating plug Phoenix MC1.5/5-ST-3.81
3. Mating plug AMP D25PHPKPC(749809-9)

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User Manual
D750
DC Power Supply
Chapter2 Installation
2.1 General
This chapter contains instructions for initial inspection, preparation for use and repackaging
for shipment. Connection to PC, setting the communication port and linking D750 are
described in Chapter 4.
NOTE
D750 generate magnetic fields which might affect the operation of other instruments. If your
equipment is susceptible to magnetic fields, do not position it adjacent to the power supply.
2.2 Preparation For Use
In order to be operational the power supply must be connected to an appropriate AC
source. The AC source voltage should be within the power supply specification. Do not
apply power before reading, Section 2.5 and 2.6.
Table 2-1 below, describes the basic setup procedure. Follow the instructions in Table 2-1 in
the sequence given to prepare the power supply for use.
Table 2-1: Basic setup procedure
Step no. Item Description Reference
1 Inspection Initial physical inspection of the power supply Section 2.3
2 Installation Installing the power supply, Ensuring adequate
ventilation.
Section 2.4
3 AC source AC source requirements Connecting the power
supply to the AC source.
Section 2.5
Section 2.6
4 Test Turn-on checkout procedure. Section 2.7
5 Load connection Wire size selection. Local/Remote sensing.
Single or multiple loads.
Section 2.8
6 Default setting The power supply setting at shipment. Section 4.2.2.1
2.3 Initial Inspection
Prior to shipment this power supply was inspected and found free of mechanical or
electrical defects. Upon unpacking of the power supply, inspect for any damage which may
have occurred in transit.
The inspection should confirm that there is no exterior damage to the power supply such
as broken knobs or connectors and that the front panel and meters face are not scratched
or cracked. Keep all packing material until the inspection has been completed. If damage
is detected, file a claim with carrier immediately and notify the Delta sales or service facility
nearest you.

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User Manual
D750
DC Power Supply
2.4 Location, Mounting And Cooling
This power supply is fan cooled. The air intake is at the front panel and the exhaust is at
the rear panel. Upon installation allow cooling air to reach the front panel ventilation inlets.
Allow minimum 10cm (4Inch) of unrestricted air space at the front and the rear of the unit.
The power supply should be used in an area that the ambient temperature does not exceed
+50ºC.
2.5 AC Source Requirements
The D750 can be operated from a nominal 85V to 265V, single phase, 47~63Hz. The input
voltage range and current required for each model is specified in Chapter 2. Ensure that
under heavy load, the AC voltage supplied to the power supply does not fall below the
specifications described in Section 1.3.
2.6 AC Input Power Connection
CAUTION
Connection of this power supply to an AC power source should be made by an electrician
or other qualified personnel.
WARNING
There is a potential shock hazard if the power supply chassis (with cover in place) is not
connected to an electrical safety ground via the safety ground in the AC input connector.
WARNING
Some components inside the power supply are at AC voltage even when the On/Off switch
is in the “Off”position. To avoid electric shock hazard, disconnect the line cord and load
and wait two minutes before removing cover.
2.6.1 AC Input Connector
The rear panel can be connected to AC power through AC and Euroblocks, and the ground
wire must be connected to ground for safe grounding.
2.6.2 AC Input Cord
WARNING
The AC input cord and ground wire size must be No. 12 AWG or larger. The AC input cord
must be no longer than 3m.

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User Manual
D750
DC Power Supply
2.7 Turn-on Checkout Procedure
2.7.1 General
The following procedure ensures that the power supply is operational and may be used as a
basic incoming inspection check. Refer to Fig.3-1 and Fig.3-2 for the location of the controls
indicated in the procedure.
2.7.2 Prior to Operation
1. Ensure that the power supply is configured to the default setting:
-AC On/Off switch at Off position.
-Dip switch: All positions at Down (”Off”) position.
-Sense connector: Configured to Local Sense as shown in Fig.2-1:
1 Remote (+) sense
2 Local (+) sense
3 Not connected (Phoenix)
4 Local (-) sense5 Remote (-) sense Fig.2-1: Sense connector default connection
2. Connect the unit to an AC source as described in section 2.6.
3. Connect a DVM with appropriate cables for the rated voltage to the output terminals.
4. Turn the front panel AC power switch to On.
2.7.3 Constant Voltage Check
1. Turn on the output by pressing OUT pushbutton so the OUT LED illuminates.
2. Observe the power supply VOLT display and rotate the Voltage encoder. Ensure that the
output voltage varies while the VOLT encoder is rotated. The minimum control range is
from zero to the maximum rated output for the power supply model. Compare the DVM
reading with the front panel VOLT display to verify the accuracy of the VOLT display.
Ensure that the front panel VOLT LED is on.
3. Turn off the front panel AC power switch.
2.7.4 Constant Current Check
1. Ensure that the front panel AC power switch is a Off position and the DVM connected to
the output terminals shows zero voltage.
2. Connect a DC shunt across the output terminals. Ensure that the shunt and the wires'
current ratings are higher than the power supply rating. Connect a DVM to the shunt.