NGI N39200 Series User manual

Hunan Next Generation Instrumental T&C Tech. Co., Ltd.
NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
N39200 Series High-accuracy
Dual-channel Programmable DC Power
Supply
User Manual
©Copyright Hunan Next Generation Instrumental T&C Tech. Co., Ltd.
Version: V20200731

Hunan Next Generation Instrumental T&C Tech. Co., Ltd.
NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
Contents
CONTENTS...................................................................................................................... 0
1 PREFACE.......................................................................................................................1
2 SAFETY INSTRUCTIONS............................................................................................... 2
2.1 Safety Notes......................................................................................................2
2.2 Safety Symbols..................................................................................................2
3 PRODUCT.....................................................................................................................3
3.1 Brief Introduction............................................................................................. 3
3.1.1 Features................................................................................................. 3
3.2 N39200 Series Lineup.......................................................................................4
3.3 Appearance & Dimension.................................................................................4
3.4 Package Contents and Accessories...................................................................5
3.5 Default Communication Parameter..................................................................5
4 PANEL INTRODUCTION............................................................................................... 6
4.1 Front Panel Introduction.................................................................................. 6
4.1.1 Screen.................................................................................................... 6
4.1.2 Button....................................................................................................7
4.1.3 Virtual Keyboard....................................................................................8
4.2 Rear Panel Introduction....................................................................................8
4.2.1 Channel Interface.................................................................................. 9
4.2.2 Four-wire Interface................................................................................9
4.2.3 LAN Port.................................................................................................9
4.2.4 RS232 Interface................................................................................... 10
4.2.5 AC Power Socket..................................................................................10
4.2.6 Grounding Screw Hole.........................................................................10
5 POWER-ON TEST....................................................................................................... 11
5.1 Preparation..................................................................................................... 11
5.1.1 Connection and Setting....................................................................... 11
5.1.2 Switch-on............................................................................................. 11
5.2 Output Check..................................................................................................12
5.2.1 Voltage Output Check..........................................................................12
5.2.2 Current Output Check......................................................................... 12
6 LOAD CONNECTION.................................................................................................. 12
6.1 Load Wire....................................................................................................... 13
6.2 Maximum Allowable Current......................................................................... 13
6.3 Connectors..................................................................................................... 13
6.4 Effect of Noise and Impedance...................................................................... 13
6.5 Inductive Load................................................................................................ 14

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
6.6 Local Sense and Remote Sense...................................................................... 14
6.6.1 Local Sense.......................................................................................... 15
6.6.2 Remote Sense...................................................................................... 15
6.7 Load Connection..........................................................................................16
7 OPERATION............................................................................................................... 18
7.1 Menu.............................................................................................................. 18
7.2 V/I................................................................................................................... 19
7.2.1 Channel Selection................................................................................20
7.2.2 Parameter Setting................................................................................21
7.3 SEQ..................................................................................................................21
7.3.1 Channel Selection................................................................................23
7.3.2 Parameter Setting................................................................................24
7.4 SEQ Edit.......................................................................................................... 25
7.4.1 Parameter Setting................................................................................27
7.5 Channel...........................................................................................................28
7.5.1 Channel Selection................................................................................29
7.5.2 Parameter Setting................................................................................30
7.5.3 CC/CV Priority Setting..........................................................................31
7.5.4 CV Priority Mode................................................................................. 34
7.6 System............................................................................................................ 35
7.6.1 IP Address Setting................................................................................36
7.6.2 Baud Rate, Beep and Language Setting...............................................37
8 REMOTE OPERATION................................................................................................ 39
8.1 RS232 Interface.............................................................................................. 39
8.2 LAN Port..........................................................................................................40
8.3 Connection to Computer................................................................................ 41
9 MAINTENANCE AND SELF-INSPECTION....................................................................43
9.1 Regular Maintenance..................................................................................... 43
9.2 Fault Self-inspection....................................................................................... 43
10 MAIN TECHNICAL DATA.......................................................................................... 44
11 APPENDIX................................................................................................................ 46
11.1 Protection and Error Alarm Description.......................................................46
11.2 Communication Interface.............................................................................46
11.3 Recommended Wire Gauge Selection Table................................................ 47
11.4 Trouble Shooting.......................................................................................... 47

Hunan Next Generation Instrumental T&C Tech. Co., Ltd.
NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
1
1 Preface
Dear Customers,
First of all, we greatly appreciate your choice of N39200 series DC power supply
(N39200 for short). We are also honored to introduce our company, Hunan Next
Generation Instrumental T&C Tech. Co., Ltd. ( NGI for short).
About Company
NGI is a professional manufacturer of intelligent equipment and test & control
instruments, mainly engaged in design, production, sales, installations and
maintenance of instruments and meters, electronic products, mechanical equipment,
automatic test systems, computer software, automatic control equipment, automatic
monitoring and alarm systems.
NGI maintains close cooperation with many universities and scientific research
institutions, and maintains close ties with many industry leaders. We strive to
develop high-quality, technology-leading products, provide high-end technologies,
and continue to explore new industry measurement and control solutions.
About User Manual
This manual is applied to N39200 series DC power supply, including installation,
operation, specifications and other detailed information. The copyright of the
manual is owned by NGI. Due to the upgrade of instrument, this manual may be
revised without notice in future versions.
This manual has been reviewed carefully by NGI for the technical accuracy. The
manufacturer declines all responsibility for possible errors in this operation manual,
if due to misprints or errors in copying. The manufacturer is not liable for
malfunctioning if the product has not correctly been operated.
To ensure the safety and correct use of N39200, please read this manual carefully,
especially the safety instructions.
Please keep this manual for future use.
Thanks for your trust and support.

Hunan Next Generation Instrumental T&C Tech. Co., Ltd.
NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
2
2 Safety Instructions
In the operation and maintenance of the instrument, please strictly comply with the
following safety instructions. Any performance regardless of attentions or specific
warnings in other chapters of the manual may impair the protective functions
provided by the instrument.
NGI shall not be liable for the results caused by the neglect of those instructions.
2.1 Safety Notes
Confirm the AC input voltage before supplying power.
Reliable grounding: Before operation, the instrument must be reliably grounded
to avoid the electric shock.
Confirm the fuse: Ensure to have installed the fuse correctly.
Do not open the chassis: The operator cannot open the instrument chassis.
Non-professional operators are not allowed to maintain or adjust it.
Do not operate under hazardous conditions: Do not operate the instrument
under flammable or explosive conditions.
Confirm the working range: Make sure the DUT is within N39200’s rated range.
2.2 Safety Symbols
Please refer to the following table for definitions of international symbols used on
the instrument or in the user manual.
Table 1
Symbol
Definition
Symbol
Definition
DC (direct current)
N
Null line or neutral line
AC (alternating current)
L
Live line
AC and DC
I
Power-on
Three-phase current
Power-off
Ground
Back-up power
Protective ground
Power-on state
Chassis ground
Power-off state
Signal ground
Risk of electric shock
WARNING
Hazardous sign
High temperature
warning
Caution
Be careful
Warning

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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3 Product
3.1 Brief Introduction
N39200 series is a high-accuracy & dual-channel programmable DC power supply,
available for benchtop use. N39200 standalone supports 2 channels output, with
each channel isolated. Both local operation on front panel and remote control on a
computer are supported. N39200 can be widely used in lab test, system integration
test, production aging line, etc.
3.1.1 Features
Automatic switch between CV and CC mode
High definition touch screen
Remote sense for accurate measurement
Single device with 2 channels, each channel isolated
Low ripple and low noise
Intelligent fan control
User-friendly interface
Lock function to avoid misoperation
LAN port and RS232 interface
Compact size, light weight
CC&CV priority function
Dual LAN ports design
Multiple protections: OVP, OCP, OTP and short circuit

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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3.2 N39200 Series Lineup
Table 2
Model
Channels
Voltage
Current
Power
N39220-60-10
2
60V
10A
200W
N39240-60-20
2
60V
20A
400W
N39260-60-20
2
60V
20A
600W
N39220-150-04
2
150V
4A
200W
N39240-150-08
2
150V
8A
400W
N39260-150-08
2
150V
8A
600W
3.3 Appearance & Dimension
VI Set
E S C
M e n u C H
O n / O f f
L o c k
S E Q P R O T
- C L R
SEQ Edit CH Config
Figure 1 Front Panel Dimension(mm)
~220VAC /50Hz
RS232
L A N 1
L A N 2
+
-
S-+
CH1
-S +
+
-
S-+
C H 2
-S +
Figure 2 Rear Panel Dimension(mm)

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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Figure 3 Side Dimension(mm)
3.4 Package Contents and Accessories
After receiving N39200, please check the instrument according to the following
steps:
1. Check whether the instrument is damaged during transportation. If any severe
damage to the package, please contact our authorized distributor or NGI.
2. Check accessories.
3. Make sure the the following accessories are attached.
Table 3
N39200 Accessories
Instructions
Power cord and fuse
For AC power connection
2 pins green connector
For output connection
4 pins green connector
For local and remote sense
RS232 cable
For RS232 communication
Ethernet cable
For Ethernet connection
USB flash drive
User manual, software & technical information
If any loss or damage, please contact our authorized distributor or NGI.
4. Check the whole instrument. If N39200 chassis is damaged or has abnormal
operation, please contact our authorized distributor or NGI.
3.5 Default Communication Parameter
Table 4
Parameter
N39200 Series Default Value
Default IP Address
192.168.0.123
Baud Rate
115200

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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4 Panel Introduction
4.1 Front Panel Introduction
VI Set
ESC
M e n u C H
On/Off
L o c k
SEQ P R O T
- C L R
SEQ Edit C H C o n fig
Figure 5 Front Panel
Table 5
4.1.1 Screen
N39200 is equipped with a 4.3 inch touch screen. The contents displayed on the
screen are as follows.
Table 6
Number
Name
Function
1
USB port
USB cable connection
2
Power switch
Power control
3
Screen
Displaying data with touch function
4
Device name
Displaying model
5
Buttons & knob
Operation mode & parameter setting
Number
Item
Function
1
Menu
Function selection
2
V/I
Voltage or current setting
3
SEQ
For sequence test
4
SEQ Edit
For sequence test editing
5
Channel
Setting protection parameters for each channel
6
System
Setting system parameters
7
About Us
NGI information
8
Remote
For remote control
9
Virtual keypad
Parameters setting

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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4.1.2 Button
N39200 front panel mainly includes a screen and buttons. Users can control the
device via buttons.
VI Set
ESC
M e n u C H
On/Off
L o c k
S E Q P R O T
- C L R
SEQ Ed it C H C on fig
Figure 6 Buttons
Table 7
Button
Function
V I S e t
To set voltage and current
M e n u
To enter the main menu
C H
Channel switch for V/I, SEQ, CH Config,etc.
SEQ
To enter SEQ mode
P R O T
- C L R
To clear the alarm
O n / O f f
To power on/off the output
ESC
To exit from setting or the present page
Lock
To lock/unlock
Compound button
1. To shift or select the desired item in menu
2. To control the cursor scrolling when setting parameter
By rotating: to select the desired item, adjust the parameter
By pressing: to enter the edit interface, confirm the input

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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4.1.3 Virtual Keyboard
N93200 is equipped with a virtual keypad on the screen for numeric input.
Figure 7 Virtual Keypad
4.2 Rear Panel Introduction
~220VAC /50H z
R S232
L A N 1
L A N 2
+
-
S-+
CH1
-S +
+
-
S-+
CH2
-S +
Figure 8 Rear Panel
Table 8
Number
Name
1
Channel interface
2
Four-wire interface
3
LAN port
4
RS232 interface

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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4.2.1 Channel Interface
Channel interface is used to connect the DUT. Please select the appropriate output
wire according to the specific N39200 model. Do not use thin wires to avoid
overheating, which may cause danger.
4.2.2 Four-wire Interface
Figure 9 Four-wire Interface
Table 9 Pin Definition
+
Output + (For local sense, internally connected to positive output terminal )
-
Output - (For local sense, internally connected to negative output terminal )
S+
Sense + (For remote sense)
S-
Sense - (For remote sense)
4.2.3 LAN Port
LAN
Figure 10 LAN Port
LAN port is used for remote control, by connecting N39200 with PC via an Ethernet
cable.
5
AC power socket
6
Air outlet
7
Grounding screw hole

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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4.2.4 RS232 Interface
RS232 interface is used for remote control. RS232 cable is supplied as standard
accessory.
1 234 5
67 89
Figure 11 RS232 Interface
Table 10
4.2.5 AC Power Socket
Please make sure the AC input voltage before supplying power.
Please ensure that the AC input voltage supplied to N39200 should not be too low
under high load conditions.
4.2.6 Grounding Screw Hole
The chassis of N39200 is insulated from the inner live conductor. However, after
long-term use or by accident, the insulating part may be damaged, which causes the
chassis to become charged. Grounding can effectively prevent electric shock.
Pin
Definition
1
NC
2
RXD, receive data
3
TXD, transmit data
4
NC
5
GND, ground
6
NC
7
NC
8
NC
9
NC

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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Warning: Please confirm the AC input power and connect to correct AC power. Wrong
AC power may cause serious damage to the instrument.
5 Power-on Test
Proper inspection should be done before operating on N39200 to ensure N39200 can
be used normally.
5.1 Preparation
5.1.1 Connection and Setting
Please follow the below steps in below table.
Table 11
5.1.2 Switch-on
Please press the power switch on the front panel.
If N39200 can not be switched on properly, please check if the power cord is well
connected and AC power supply is available.
Step
Item
Description
1
Inspection
To inspect if there is physical damage
2
Grounding
To connect the ground to prevent an electric shock
3
AC Power Input
To connect to proper AC power
4
Load Connection
To connect to a load with proper wire
5
Default Setting
To do factory reset
Warning: Even if the power switch is under off state, some components inside N39200
may still carry a high voltage. To avoid electric shock, it is forbidden to open the chassis.
Warning: If N39200 chassis and upper cover are not safely grounded, there is a danger
of electric shock.

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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5.2 Output Inspection
The output inspection can ensure that N39200 can reach its rated output and can
perform the operations on the front panel properly.
5.2.1 Voltage Output Inspection
Please follow the below steps to verify the basic voltage functions without a load.
1. Press the power switch on N39200.
2. Set voltage to 1V.
3. Press
O n / O f f
on the front panel to enable output.
4. Check if the displayed voltage is close to 1V.
5. Make sure the voltage can be adjusted from 0V to maximum voltage within the
range.
5.2.2 Current Output Inspection
Please follow the below steps to verify the basic current functions with a short on
N39200’s output.
1. Press the power switch on N39200.
2. Make sure N39200 output is under OFF state. It will show OFF on the LCD.
3. Use an insulated test lead to connect a short across the positive(+) and negative(-)
output terminals. The lead should bear the maximum current.
4. Set current to 1A.
5. Press
O n / O f f
on the front panel to enable output.
6. Check if the displayed current is close to 1A.
7. Make sure the current can be adjusted from 0A to maximum current within the
range.
6 Load Connection
Warning: Please turn off the AC input power before changing any connections on the
rear panel. Before supplying power, please check and confirm that all connections are
fastened. Touching any terminal or interface on the rear panel with N39200 powered on
may cause electric shock.

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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Note: Please refer to the recommended wire gauge selection table in the appendix.
6.1 Load Wire
Load wire is not included among N39200 series standard accessories. Users need to
prepare load wire. Please refer to the follow requirements while selecting load wire.
1. The maximum allowable current of wire.
2. The insulation level of wire should not be lower than the maximum output
voltage of the power supply.
3. The maximum wire length and voltage drop.
4. Noise and impedance effects on the load wire.
6.2 Maximum Allowable Current
The following two factors should be considered when selecting the wire gauge.
1. The wire should be thick enough to avoid overheating when carrying rated load
current or load short-circuit current. The greater shall prevail.
2. The wire gauge should be selected properly to minimize the voltage drop on each
wire and to prevent excessive output power consumption of the power supply, which
affects the load regulation. Although N39200 series adopts remote sense to
compensate the voltage, it is still recommended to minimize the voltage drop.
6.3 Connectors
N39200 is supplied with two 2-pin connector and two 4-pin connector for connection
between wire and N39200 output.
Please do not connect wire directly to N39200 output, which is easy to loose. The
2-pin connector or 4-pin connector should be used for connection.
6.4 Effect of Noise and Impedance
In order to reduce noise or radiation, the load wire and the remote sense wire should
be twisted pair. The wire length should be as short as possible. Shielded wires must
be used in high noise environments. The shielding part is connected to chassis
through the grounding screw hole on rear panel.
Note: Please refer to the recommended wire gauge selection table in the appendix.

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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Even if the noise is not loud, the load wire and remote sense wire should also be
twisted pair to reduce coupling and increase the stability of power supply. The
remote sense wire must be separated from AC input power cord.
Twisted-pair load wire can reduce the parasitic inductance of the wire and prevent
high-frequency voltage peak on the load and the output of power supply, caused by
fluctuation of the load current.
The impedance between the output of power supply and the load makes the ripple &
noise on the load higher than at the rear panel terminal of power supply. If necessary,
an additional filter circuit with a bypass capacitor can be connected to the load to
limit the high-frequency load current.
6.5 Inductive Load
When using N39200 to supply power to inductive loads such as motors, users can
connect a diode across the output of N39200 since the inductive load will produce a
voltage spike which is harmful to N39200. The rated voltage and current of the diode
should be higher than the rated output voltage and current of power supply. The
negative polarity of diode is connected to the positive output of N39200. The
positive polarity is connected to the negative output of N39200.
When using N39200 to supply power to inductive loads such as motors, load
transients, such as counter electromotive force from motors, may occur. Please
connect a surge current suppressor across the output of N39200 to protect N39200.
The rated breakdown voltage of surge current suppressor must be approximately
10% higher than the rated output voltage of N39200.
6.6 Local Sense and Remote Sense
The four-wire interface at rear panel is used for local sense and remote sense. Please
refer to four-wire interface introduction. N39200 is supplied with 4-pin green
connector for remote sense.

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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Figure 12 4-pin Green Connector
6.6.1 Local Sense
In local sense, output voltage is adjusted at the output terminal of N39200. This way
does not compensate for the voltage drop on the load wire. It is recommended to
use local sense when the load current is low or the load regulation is not very critical.
6.6.2 Remote Sense
Due to the parasitic resistance on the wire, a voltage drop will be generated on the
wire after the current flows. Assuming that output of the power supply is set to
55V/10A and the resistance of the load wire is 0.5 ohms, a 5V voltage drop will be
generated on the wire. The actual voltage reaching the load is only 50V, which affects
the output accuracy of the power supply. In this case, it is necessary to compensate
for the voltage drop on the wire.
The remote sense wire is directly connected to the load from four-wire interface on
the rear panel of power supply. Since the remote sense wire is directly connected to
the high impedance measurement circuit inside the supply, and the current on
remote sense wire is very low, the voltage drop generated is negligible. The voltage
across the load is fed back to the power supply control loop via remote sense wire.
The supply will adjust its output to compensate for the voltage drop on the load wire
so that the voltage across the load is equal to the set voltage.
Note: On the 4-pin connector, jumpers have been used to connect S+ to +and S- to -.
When using local sense, please put the 4-pin connector at rear panel. Unplugging the
connector will leave the remote sense terminal disconnected, which will affect the
voltage regulation and may cause the power supply to be unstable and dangerous.

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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Note: When rated output voltage of N39200 series is higher than the safe voltage, a
dangerous voltage may exist at the connection between the supply output and the load.
In order to protect operators from accidental contact with dangerous voltages, please
ensure that there are no accessible live parts on the load and its connections. Please
also make sure that the insulation level of the load wire is higher than or equal to the
maximum output voltage of N39200.
It is recommended to use remote sense when load regulation is very critical. The
procedure is as below.
1. Press the power switch to shut off the power supply.
2. Disconnect the jumpers on the 4-pin green connector.
3. Connect S+ to positive polarity on load and S- to negative polarity on load with
proper wire.
4. Plug the connector into the four-wire interface on rear panel of supply.
5. Connect the output of power supply to the load.
6. Press the power switch to power on the power supply.
6.7 Load Connection
Figure 13 Local Sense Wiring Diagram

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NGI lNGI N39200 Series High-accuracy Dual-channel Programmable DC Power Supply
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Figure 14 Remote Sense Wiring Diagram