Tonghui TH 6900 Series User manual

OPERATION MANUAL
TH 6900 Series
Constant Power DC
Power Supply
TH 6900 Series DC Power Supply
V 1 .1 @ 2022.06

Table of Contents
Chapter 1 Overview ..........................................................................................................1
1.1 Introduction ..........................................................................................................1
1.2 Product Features .................................................................................................1
1.3 Safety Instructions ...............................................................................................2
1.3.1 Safety Symbols..........................................................................................2
1.3.2 Safety Brief ................................................................................................3
1.4 Unpacking & Installation ......................................................................................5
1.4.1 Selected Installation Location....................................................................5
1.4.1.1 Inspection Before Unpacking ..........................................................5
1.4.1.2 Unpacking .......................................................................................5
1.4.2 Environment...............................................................................................6
1.4.3 Input Wiring................................................................................................7
1.4.4 Output Wiring.............................................................................................7
1.4.4.1 Wiring Instruction.............................................................................7
1.4.4.2 Battery Load Wiring Instruction.......................................................8
1.4.4.3 Inductive Load Wiring Instruction....................................................9
1.4.4.4 Wire Diameter Requirement............................................................9
Chapter 2 Panel 1 ..........................................................................................................2-1
2.1 Front Panel Description .......................................................................................1
2.1.1 Key Function Introduction..........................................................................1
2.2 Rear Panel Description........................................................................................3
2.3 Technical Specifications.......................................................................................3
2.3.1 Electrical Characteristics ...........................................................................3
2.3.2 Voltage & Current Specifications...............................................................5
2.3.3 Dimensions................................................................................................5
Chapter 3 Operating Instructions 1SCPI Protocol 6-11

Chapter 1 Overview
1
Chapter 1 Overview
Thank you for purchasing and using our products. Before you use
this instrument, please first confirm the matters in Chapter 7 of
the manual "Warranty" to protect your rights and interests.
1.1 Introduction
TH6900 series constant power DC power supply (or DC power
supply) is a DC type programmable power supply with exquisite
appearance, small size, high performance, powerful function and
simple operation. It is a high performance and wide range single
output DC high power switching power supply for test systems in
aerospace and defense, consumer electronics, computer and
peripheral, communication, semiconductor, solar and automotive
electronics industries.
The functional features of TH6900 series constant power DC
power supply are as follows:
⚫High resolution and high accuracy;
⚫Low ripple and low noise;
⚫Wide voltage range, 0~1000V, various voltage levels
available;
⚫Support multiplemodes, power supply constant voltage (CV),
constant current (CC), constant power (CP) mode;
⚫Fast transient response capability;
⚫Flexible operation interface for user-friendly operation;
⚫Output parallel connection is possible, and the modular
design is convenient for users to expand capacity;
⚫Flexible and powerful sequence test function;
⚫Complete protection, safety performance is guaranteed;
⚫Support OVP, OCP, OPP and input undervoltage protection
and over-temperature protection of the power supply;
⚫With analog control interface, the power output can be
controlled separately through the external analog interface;
⚫Built-in USB/RS232/GPIB/LAN/CAN communication
interface.
1.2 Product Features
TH6900 series constant power DC power supply is only 2U
chassis, especially suitable for system testing and industrial
control, the basic functions of the power supply are mainly:
⚫Constant voltage (CV) mode, constant current (CC) mode,
constant power (CP) mode output
The output mode of the DC test power supply is divided into
constant voltage (CV) mode, constant current (CC) mode
and constant power (CP) mode. The output mode depends
on the set value of the output voltage, and current as well as

Chapter 1 Overview
2
the size of load resistance.
⚫Built-in input undervoltage, short circuit, over-temperature
protection, internal hardware input undervoltage, short circuit,
over-temperature protection, can stop the output in the
shortest time to protect the DC test power supply and the
load in the connection.
⚫POST Function
Every time the system is powered on, it must perform a self-
test to check some of the internal circuits, and if it is not
normal, it cannot enter the normal standby state interface.
⚫10 non-volatile save and read back shortcut groups
To adapt to different test requirements, save 10 groups of
opearting modes, and store 10 groups of modes in non-
volatile memory. They are not lost after power failure, and it
can be easily recalled.
⚫Sequence test
The sequence test function contains a total of 50 sequences
stored in non-volatile memory, each group contains 20 test
steps, the user can edit the function of each step according
to actual needs, so that the power supply can be output in
constant voltage, constant current or constant power mode
in a sequence to meet specific test requirements.
⚫Local or remote control operation mode
Switching the local operation mode, local mode can be
operated by keystroke, and remote mode can only be
operated by communication port. Please refer to the
appendix for the specific commands of the protocol used for
external communication.
⚫Analog port remote control operation mode
With a variety of voltage, current and overvoltage given
mode, and complete control and monitoring functions.
1.3 Safety Instructions
The safety precautions in this section and in the manual must be
followed throughout the operation, maintenance, and repair of
this product. Failure to follow these safety precautions results in
the manufacturer disclaring that it is not responsible for the user's
operations in violation of such requirements.
1.3.1 Safety Symbols
Symbol
Description
Symbol
Description
Grounding
Turn on the power
Disconnect the power

Chapter 1 Overview
3
PE
Protective
Conductor
Indicates a switch that turns the
power ON/OFF with the same
operator. The normally used
button has two stable positions.
Prohibit
High temperature: indicates that
the temperature here is higher
than the acceptable range of the
human body, do not arbitrarily
contact to avoid injury to
personnel.
High Voltage Risk
This logo suggests that this
device should not be mixed with
other household waste for
disposal. To prevent
uncontrollable waste disposal
from causing adverse ecological
and health effects, the device
should be recycled to improve
the utilization of material
resources. When recycling old
devices, you can contact the
retailer.
Indoor Use
Safety: To avoid injury to
personnel or damage to the
instrument, the operator
must refer to the
instructions in the manual.
Danger! High Voltage
The logo indicates that
there is a risk that failure to
follow the operating
instructions may result in
personal injury, so please
do not operate without
understanding the
instructions.
This logo indicates that there is
a risk that failure to follow
operating instructions may result
in injury or death, and this logo
draws your attention to
procedures, practices,
conditions, etc.
1.3.2 Safety Brief
The following general safety precautions must be observed
during operation or maintenance of this instrument, and we will
not be liable for any injury to persons or damage to machinery
caused by the customer's failure to observe these precautions or
any of the specific warnings in this manual.
Please be sure to read this manual thoroughly before use and keep it in
a safe place.

Chapter 1 Overview
4
Do not use the product for purposes other than those described in the
manual.
Before connecting the power supply, please check that the power supply
meets the rated input value of the instrument, and make sure the switch
is OFF.
Protective grounding: Before turning on the power, be sure to connect
the protective grounding to prevent electric shock.
The need for protective grounding: Do not disconnect the internal or
external protective ground wire or interrupt the connection of the
protective ground terminal. Doing so will cause a potential electric
shock hazard that may cause injury to humans.
Fuses: Use only fuses of the required rated current, voltage and
specific form (normal fuse, time delay, etc.). Do not use fuses of
different specifications or short-circuit fuse holders, as this may cause
a risk of electric shock or fire.
Do not remove the housing of the instrument: The operator must not
remove the housing of the instrument. Replacement of parts and
internal adjustments should only be carried out by qualified service
personnel.
Do not operate in explosive or corrosive atmospheres
Do not operate the instrument under flammable gas or gaseous or
corrosive atmospheres
●Please turn off the power switch and disconnect all the wires
when you change the position of the product.
●The weight of the product is more than 20kg, please operate
more than two people when resetting the position, you can find
the weight of the product in the product manual.
●Please be careful when handling the product, avoid collision, the
high product is easy to fall, please be careful.
●Check to make sure that the AC input voltage setting is
consistent with the fuse specification and that there is no
abnormality on the surface of the power cord, and make sure to
disconnect the power cord or turn off the power switch before
checking.
●If there is any abnormality or fault, please stop using

Chapter 1 Overview
5
immediately, disconnect the power cord or disconnect the power
from the power distribution box, and do not use until the product
is repaired.
●Please use a cable with higher overcurrent capacity for output or
load cable.
Do not allow water droplets or metal objects to enter the interior of
this product.
If the product is damaged due to the use of incorrect grid input,
it is not covered by the product warranty.
When the voltage and current setting is completed and the
output is started, the output terminal is a dangerous voltage,
and touching it arbitrarily may cause injury or death.
1.4 Unpacking & Installation
1.4.1 Selected Installation Location
When installing, please choose a location with good ventilation
and heat dissipation, the distance between the air inlet (outlet)
and the wall or shelter should be more than 30cm, and avoid
placing in the environment of direct sunlight, hot and humid,
corrosive substances, and water shower is strictly prohibited.
1.4.1.1 Inspection Before Unpacking
Check the box for damage, and if damage is found, notify the
freight forwarder to inspect the goods and record the damage at
the time of delivery. If there is no damage, open the box
according to the following steps.
1.4.1.2 Unpacking
(1) Unpack the equipment according to the requirements of the
outer box of the equipment and remove the equipment.
(2) First check the product nameplate to make sure the model
matches the order, check the objects in the box tomake sure
they match the packing list, if the items in the box do not
match the contents listed in the "packing list", please contact
the distributor or customer service center of Changzhou
Tonghui Electronic Co.Ltd.
(3) Visually observe whether there are obvious such as metal
scratches damage, scribbles, dents, etc., check whether
there is a loose connection, fasteners have not fallen off, or
other abnormalities, if damage is found, please immediately

Chapter 1 Overview
6
notify Changzhou Tonghui Electronics Co., Ltd. or its
distributors. Our customer service center will repair or
replace the machine for you. Please do not return the
product immediately without notifying Changzhou TongHui
Electronics Co., Ltd. or its dealers.
(4) To prevent accidental electric shock, please do not open the
top cover of the instrument by yourself. If any abnormality
happens to the instrument, please seek technical support
from Changzhou Tonghui Electronics Co.,Ltd. or its
designated distributors.
1.4.2 Environment
(1) Power supply in the installation should maintain good
ventilation and heat dissipation, power supply inlet (outlet)
and the distance between the wall or shelter should be more
than 30cm, and contact with corrosive substances is strictly
prohibited.
(2) Please make sure that the AC power to be connected meets
the specifications.
(3) Please refer to the specification parameters of each model
for ambient temperature and humidity.
(4) After the power supply is installed and test run, it is
recommended that the power supply should be left in an
energized state so that it can provide the best operating
conditions forthe electronic components and can keep some
of the important components from getting wet. If the power
supplyhasnotbeen used foralongtime,itshouldbevisually
inspected first, and if moisture is found in any internal
location, this part must be made dry before use. General
environmental conditions:
⚫Not for outdoor use.
⚫Keep away from flammable and explosive corrosive
media: such as alcohol, diluent, sulfuric acid and other
flammable and explosive corrosive materials.
⚫Keep away from heat sources and avoid exposure to the
sun.
⚫Operating environment temperature: 0℃~+50℃
⚫Storage environment temperature: -25℃~+65℃
⚫Keep away from boilers, humidifiers, water sources, etc.
⚫Working relative humidity:10~95%RH, no condensation.
⚫Storage relative humidity: not more than 80% (storage
in high humidity environments, it is recommended to run
the machine regularly for 20 minutes to avoid
condensation of water vapor).
⚫Keep away from strong electromagnetic interference
sources and significant vibration and shock.
⚫The working environment must be well ventilated and
free of dust. Please keep the area around the vent open

Chapter 1 Overview
7
within 30cm and without any sundries.
⚫Rapid changes in temperature must be avoided. Rapid
changes in temperature can cause water vapor to
condense inside the machine. When water vapor
condensation occurs, the use of this power supply is
prohibited.
⚫The input AC supply voltage fluctuates by ±10% of the
rated voltage.
⚫The product should not be placed in a restricted location
where the plug cannot be easily removed or the input
switch cannot be easily disconnected to prevent a
dangerous situation where the input cannot be
disconnected.
1.4.3 Input Wiring
The connection between the power supply and the mains needs
to use the attached power cord. If you need to use a different AC
line, please ensure that the cross-section of the line is at least
2.5mm 2 . The default input value of this series is 220V±10V, 16A,
50Hz.
Please make sure the input power is disconnected before
wiring. Due to the existence of leakage current, it can lead to
the enclosure being charged, the grounding terminal should
be well grounded to protect the safety of personnel.
The DC power input requires the connection of a circuit
breaker or fuse with a current rating of 1.25 times the
maximum input current of the power supply.
1.4.4 Output Wiring
1.4.4.1 Wiring Instructions
(1) Connection method when lead voltage drop compensation
function is not used
Connect the output terminals to the load as shown in Figure
2-1(a), and use the short route to connect the positive output
terminal to S+ and the negative output terminal to S-. At this
time, no compensation of lead voltage drop is performed,
and the voltage value displayed is the voltage at the output
of the power supply, not the voltage at both ends of the load.
(2) Connection method when using the lead voltage drop
compensation function

Chapter 1 Overview
8
Connect the output terminals to the load as shown in Figure
2-1(b), with the positive output and S+ connected to one end of
the load at the same time, and the negative output and S-
connected to the other end of the load at the same time, at this
time the displayed voltage value is the actual voltage at both
ends of the load, realizing the function of lead voltage drop
compensation.
No lead voltage drop compensation function Use of lead voltage drop
compensation function
(a) (b)
Figure 1-1 Output Wiring
If the output terminals of the power supply are not wired to the
load, but only the SENSE line is connected, the current flows
from the SENSE line and can damage the internal devices of
the power supply.
1.4.4.2 Battery Load Wiring Instructions
The TH6900 series constant power DC power supply can be
applied to battery type loads andmust be operated in accordance
with the following precautions in the process of use.
(1) Must be wired in accordance with Figure 1-2:
Figure 1-2 Battery Load Wiring Mode
(2) Connect a diode or DC contactor (diode module is
recommended) in series between the DC power supply and
the load (battery). Avoid causing damage to the DC power
supply and the battery.
(3) The diode is selected according to the following principles:
the minimum reverse withstand voltage value is 2~3 times the
output voltage of the DC test power supply; the minimum
+
-
S
+
S
-

Chapter 1 Overview
9
forward conduction current is 1.5 times the maximum output
current of the DC source.
(4) Operation with contactors
First, when connecting the DC test power supply to the load,
the contactor must be disconnected; second, after the DC
test power supply is turned on and the output is activated,
the contactor is closed;
Finally, when stopping charging, the contactor must be
disconnected before stopping the DC test power output.
1.4.4.3 Inductive Load Wiring Instructions
The TH6900 series constant power DC power supply can be
applied to inductive loads and must be operated in accordance
with the following precautions during use.
(1) Must be wired as shown in Figure 1-3:
Figure 1-3 Inductive Load Wiring Mode
(2) Connect diodes or DC contactors (diode modules are
recommended) in parallel or series between each DC power
supply and the load (inductive). Avoid causing damage to the
DC power supply and the load.
(3) The diode is selected according to the following principles:
the minimum reverse withstand voltage value is 2~3 times the
output voltage of the DC test power supply; the minimum
forward conduction current is 1.5 times the maximum output
current of the DC source.
1.4.4.4 Wire Diameter Requirements
Current
Input Lead Wire Diameter
(including ground wire)
Output Lead Wire
Diameter
10A
BVR 2.5mm2
BVR 2mm2
15A
BVR 2mm2
20A
BVR 2.5mm2
30A
BVR 6mm2
60A
BVR 16mm2
120A
BVR 50mm2
Table 1-1 Output Lead Wire Diameter

Chapter 1 Overview
10
1) Please do not use the wire that is too thin in diameter to avoid
overheating of the connection wire, which may cause danger.
2) The ground wire is recommended to use copper braid with a
single wire diameter of not more than 0.15mm.

Chapter 2 Panel Description
1
Chapter 2 Panel Description
The content of this chapter is only a general description, the specific operations
and detailed explanation refer to the corresponding content of Chapter 3.
2.1 Front Panel Description
The front panel of TH6900 system power supply 2U model is the same, and the
front panel of other models is the same as the front panel of 2U model. The
following schematic diagram is the front panel schematic diagram and key
function diagram of 2U model.
The schematic diagram of the front panel is shown in Figure 2-1.
Index
Features
Index
Features
1
Power switch button
5
Turn the button to adjust the
voltage and current output value
2
Liquid Crystal Display
6
Start, stop output buttons and
function buttons
3
Functional soft keyboard
7
Number keys and Escape key
4
Status indicator
2.1.1 Key Function Introduction
The front panel keypad area is shown in the figure above. The keys set and
control the output voltage and current, and provide the output status display
through the LCD screen, with specific function descriptions:
Key Name
Function Description
F1-F4
The 4 buttons have different functions in different
interfaces for user convenience.
Rotate button
In the setup interface, the CURRENT knob is used to
adjust the cursor position, and the VOLTAGE knob is used
to modify the value of the parameter corresponding to the
cursor; in the power-on output state, the VOLTAGE knob
is used to modify the voltage output value, and the
CURRENT knob is used to modify the current output value.

Chapter 2 Panel Description
2
Start/Stop key
Start or stop setting voltage and current output
VOLT
Voltage setting key, set the power output voltage value
CURR
Current setting key, set the power output current value
POWER
Power value setting, used to set the power supply output
power
MENU
used to access the main menu
▲/▼
Up and down keys, used to select menu items in menu
operations
CANCEL
Return key, return to the previous menu, set parameters
invalid
0~9 number
keys
Numeric input keys
ENTER
Confirmation key to confirm the entered number and
operation
(1) LED indicators: 4 indicators, when lit, indicate entry into the corresponding
state.
(2) CV: The light is on to indicate that it is in constant voltage output mode.
(3) CC: The light is on to indicate that it is in constant current output mode.
(4) CP: The light is on to indicate that it is in constant power output mode.
(5) REMOTE: The light is on to indicate that the remote mode is entered.
When the switch is closed, it does not cut off the external input
voltage, there is still high voltage inside the chasis, users should not open
the case by themselves, customer service personnel for maintenance,
should first remove the input cable.
Menu , VOLT , CURR , POWER do not respond in the
sequence test execution, pause, single-step execution, and
constant power mode execution screens.

Chapter 2 Panel Description
3
2.2 Rear Panel Description
The rear panel of TH6900 system power supply 2U model is the same, and the
rear panel of other modelsis the same as that of 2U model. Figure 2-2 is the rear
panel schematic of the 2U model.
Figure 2-2 Rear Panel Schematic
Index
Features
Index
Features
1
Parallel input interface: as a
slave
5
Power output terminal
2
Parallel output interface: as a
host
6
Remote S compensation
terminal
3
USB interface
7
Power input terminal
4
RS232/RS485/CAN/remote
analog control interface
Optional: Analog control interface, through which external analog signals control
the output of the power supply, including voltage, current, OVP settings,
start/stop, output and status monitoring.
2.3 technical specifications
TH6900series constantpowerDC test powersupplycontains threebasicmodels,
750W, 1.5KW and 3KW, with output voltage from 0~40V to 0~1000V and output
current from 0~2.5A to 0~120A, corresponding to different models. Regardless
ofmanual control or remote control (analog or digital), voltage, current and power
can be continuously adjusted between 0% and 100%.
2.3.1 Electrical Characteristics
AC input voltage
Voltage
90~264V, 1ph+N (model 1500W)
180~264V, 1ph+N (model 3000W)
Frequency
45~66Hz
Power Factor
≥0.99

Chapter 2 Panel Description
4
Power Derating
Model 1500W: <150VAC reduced to 1000W
Model 3000W: <205VAC reduced to 2500W
DC Output Voltage
Accuracy
±(%of output+offset)
≤±(0.05%+0.04%FS)
0-100% Load Regulation
≤0.05% of full scale
±10%ΔUAC Linear Adjustment
Rate
≤0.02% of full scale
Load 10-100% adjustment time
required
≤2ms
Output Voltage Rise Time
Maximum 30ms (10~90% full scale)
Overvoltage Protection
Adjustable, the range is 0~110%
DC Output Current
Accuracy
±(%of output+offset)
≤±(0.15%+0.1%FS)
0-100%ΔUDC Load Regulation
≤0.15% of full scale
±10%ΔUAC Linear Adjustment
Rate
≤0.05% of full scale
DC Output Power
Accuracy
≤0.8% of full scale
Protective Function
OTP,OVP,OCP,OPP,PF
Isolation Withstand Voltage
AC input to housing
2500VDC
AC input to DC output
2500VDC
DC output to housing (PE)
Negative pole: 400VDC max, Positive pole: 400VDC max +
output voltage
Analog Interface:
Built-in 15-pin D-Sub female connector, electrical isolation
Signal Range
0~5V or 0~10V (switchable)
U / I / P / R Accuracy
0~10V: ≤0.2% 0~5V: ≤0.4%
Communication Interface
RS232/RS485/CAN/GPIB/USB/LAN and other
communication interfaces
Parallel Operation
Achievable, with true master-slave operation, to connect up
to 10 products (via shared bus)

Chapter 2 Panel Description
5
Cooling Mode
Temperature controlled fan
Operating Temperature
0~50℃
Storage Temperature
-20~70℃
Humidity
<80%, no condensation
Operational Height
<2000m
2.3.2 Voltage & Current Specifications
Voltage
Power
Efficiency
Ripple and Noise
750W
1.5KW
3KW
RMS
(20Hz-300KHz)
PP
(20Hz-20MHz)
Current
40
60
60
120
≤92%
20mVrms
75mVpp
80
30
60
120
≤92%
20mVrms
100mVpp
200
12.5
30
60
≤92%
25mVrms
175mVpp
360
7.5
15
30
≤93%
30mVrms
250mVpp
500
5
10
20
≤93%
45mVrms
325mVpp
750
3
7.5
15
≤93%
75mVrms
500mVpp
1000
2.5
5
10
≤93%
100mVrms
650mVpp
*VPP measurement requires a 1uF capacitor connected to the output terminal
with a lead length of1.8m, full load, and standard input voltage.
*VRMS measurements are taken directly at the output terminal, at full load,
with standard input voltage.
2.3.3 Dimensions
Physical Parameters
2U Model
Width
482mm
Length
455mm
Height
88mm

Chapter 2 Panel Description
6
Weight
13.5Kg
Figure 2 -3 Dimensions

Chapter 3 Operating Instructions
1
Chapter 3 Operating Instructions
3.1 Introduction
This chapter will describe in detail how to use the front panel of
the power supply to achieve the power supply function and
operation of the power supply, the preparation and inspection of
the power supply before use:
(1) Make sure that the power cable and input and output cables
are properly connected.
(2) Please read the safety and warning signs posted on the
instrument itself carefully before use.
3.2 Display Frame Description
3.2.1 Startup Picture
After checking the power cord to make sure it is correct, turn on
the power switch. The welcome interface is shown in Figure 3-1
after power on.
Figure 3-1 Boot Screen
Under normal condition, it enters the standby interface about 5-
10S, otherwise the power supply will enter the corresponding
alarm state according to the error detected by self-test.
After the self-test is completed, the standby interface is entered,
as shown in Figure 3-2:

Chapter 3 Operating Instructions
2
Figure 3-2 Standby Interface
3.2.2 Start & Stop
Press the ON/OFF button, if the start is successful, the red
indicator inside the ON/OFF button lights up, indicating that it is
in the output working state, while the indicator shows that it is
currently in the CV, CP or CC state, as shown in Figure 3-3.
Figure 3 -3 Boot Screen
In the start state, press the ON/OFF button to stop the output and
the output indicator goes out.
3.2.3 Set Output Voltage, Current and Power Values
In the standby interface, press the VOLT or CURR or POWER
button to change the setting parameters directly. A white line will
be prompted below the selected parameter, press the numericr
keys or use the knob to modify the selected value, as shown in
Figure 3-4 .
Figure 3-4 Setup Mode
3.2.4 Basic Setup
Under the comprehensive setting interface, you can mainly set
the machine’s LCD screen brightness, key sounds, language
switching, keyboard lock, and view the machine system
information. In the standby interface, press F4 to enter the
comprehensive setting interface, as shown in Figure 3-5 . Use