RND 320-KEL Series
USER MANUAL – BEDIENUNGSANLEITUNG – ANVÄNDARMANUAL
RND 320-KEL Series
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Table of Contents
SAFETY INSTRUCTION 3
RND 320-KEL SeriesRND 320-KEL Series
SAFETY INSTRUCTION
Safety Symbols
AC lnput 4
Fuse 4
3
OVERVIEW 5
Introduction
Main Features 5
Front Panel Overview 6
5
OPERATION 6
Keyboard Operation
Seing the Max Value of Load 7
Steady State 8
The Storage of Steady State and Recalling 10
6
Safety Symbols
These safety symbols may appear in this manual or on the series.
WARNING
Ml-MS Fast Recall and Storage 10
Short Circuit 11
Dynamic Test 11
Sequential Operation 17
Baery Test 19
OCP Test 21
OPP Test 24
External Trigger 27
Remote Compensation 28
Keyboard LOCK 28
Buzzer ON/OFF 29
Communication 29
DANGER High Voltage
EARTH (ground) Terminal
SPECIFICATIONS 30
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RND 320-KEL SeriesRND 320-KEL Series
Safety Guidelines
• Do not block or obstruct the cooling fan vent opening
• Avoid severe impacts or rough handling that leads to damage.
• Do not discharge static electricity.
• Do not disassemble unless you are qualied as service personnel.
AC INPUT
• AC Input Voltage: 110V / 120V / 220V / 230V , 50 / 60 Hz
• Connect the protective grounding conductor of the AC power cord to an earth
ground, to avoid electrical shock.
Operation
Environment
• Location: Indoor, no direct sunlight, dust free, almost non-conductive pollution
(note below)
• Relative Humidity:< 80%
• Altitude: < 2000 m
• Temperature: 0-40 OC
Introduction
RND KEL series (150W~300W), single-channel programmable DC
electronic loads, are designed for middle & high-end applications.
They can oer multiple solutions according to your needs.
The online voltage measures and adjusts, or simulate a short
circuit test, using the simple keypad on the front panel. RND
KEL series DC loads are versatile instruments for static and
dynamic testing of power supplies, baeries, DC DC converters,
and baery chargers, providing users the best testing
solution.
Main Features
• Highlight LED display
• 5digit displays, and accurate outputs
• Resolution of voltage and current: 0.1 mV / 0.1 mAProtection
and Over voltage Protection
• 100 groups of memories for fast recall
• Four working modes: CV/CC/CR/CP
Storage
Environment
• Location: Indoor
• Relative Humidity: < 70%
• Temperature: -10-70”C-
FUSE
• To ensure re protection, replace the fuse only with the specied type
and rating.
• Disconnect the power cord before fuse replacement.
• Make sure the cause of fuse blow out is xed before fuse replacement.
MODEL
RND
320-KEL102
RND
320-KEL103
110V/120V
220V/230V
• Remote Compensation Function
• Baery Test Function
• Key board Lock
• Power o memory function
• Short-circuit function
• Remote Compensation Function
• External Trigger Function
• Seing Function of Baud Rate
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RND 320-KEL SeriesRND 320-KEL Series
Front Panel Overview
2. Seing the maximum value of load
Description: Seing low voltage (18V), low current (3A) and below them
will improve accuracy.
Method of operation: Taking the max current 3A, max voltage 18V and
max power 100W as example, the max resistance is 1000ohms.
1. Keyboard Operation
1. Esc: Cancel key which can return to the initial mode.
2. Ml-MS: quickly recalling the Ml-MS stored value of the
steady state.
3. Recall: Recall Key, such as, recalling the steady storage
with Ca11+2.
4. Shi: Seing or Storage Function Keys, such as storing the
stationary content with Shi+2.
5. Le-Rotating Key, moving to where needs to be adjusted and
will ash.
6. Entering numbers.
7. Constant Current Mode Buon.
8. Constant Voltage Mode Buon.
9. Constant Power Mode Buon.
10. Constant Resistance Mode Buon.
11. Conrmation Buon.
12. On/O: Turning On/O the load output.
13. £.-Adjusting the number or selecting Add.
14. T-Adjusting the number or selecting subtract.
15. Knob: Adjusting the number or selecting it.
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RND 320-KEL SeriesRND 320-KEL Series
3. The Operation Function of Steady State
Note: The electronic load can work in the following 4
steady-state mode.
3.1 Constant Current Operation Mode CC
Note: In constant current mode, the load makes the tested
equipment on the set voltage no maer how the input voltage
changes.
Operation Method:
1. Press the CC buon on the keyboard to enter constant
current operation mode.
2. Seing the desired constant current through the keyboard.
3. Turn on the ON/OFF buon to start the electronic load.
Load Current
Operation Method:
1. Press the CR buon on the keyboard to enter constant resistance
operation mode.
2. Seing the desired constant resistance through the keyboard.
3. Turn on the ON/OFF buon to start the electronic load.
3.2 Constant Voltage Operation Mode CV
Note: In constant voltage mode, the load makes the tested equipment
on the set voltage no maer how the input current changes.
Operation Method: 1. Press the CV buon on the keyboard to enter
constant voltage operation mode.
2. Seing the desired constant voltage through the keyboard.
3. Turn on the ON/OFF buon to start the electronic load. Load Voltage
3.4 Constant Power Operation Mode CW
Note: In constant power mode, the load makes the tested equipment
on the set resistance no maer how the input voltage and current
change.
Operation Method: 1. Press the CW buon on the keyboard to enter
constant power operation mode.
2. Seing the desired constant power through the keyboard.
3. Turn on the ON/OFF buon to start the electronic load.
3.3 Constant Resistance Operation Mode CR
Note: In constant resistance mode, the load makes the tested
equipment on the set resistance no maer how the input voltage and
current change.
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RND 320-KEL SeriesRND 320-KEL Series
4. The Storage Function of Steady State and Recalling
Note: The load can save and recall 100 sets of stationary seing values.
And to set the values, the number keys, knob and up & down buons all
can be used.
4.1 Storage function
Operation Method: Taking 10.000V stored to 99 as example.
5. Ml-MS Fast Recall and Storage Function
5.1 Ml-MS Fast Recall Function
Note: By pressing Ml-MS, the steady state content stored in Ml-MS
can be quickly recalled.
5.2 Ml-MS Fast Storage Function
Note: You can change the content of Ml-MS by selecting Ml-MS
buon; and then press the currently selected Ml-MS buon to fast
save the value to the currently selected M key.
For example, the previous content of Ml is CV+15.001V and now
needing to modify as CV+14.000V, you can press Ml to recall the
content and then modify to 14.000V through rotating the knob and
then pressing the number keys to select the value you want. Aer
that, press Ml again to save it in Ml.
6. Short Circuit Function
Note: the load will make the tested equipment output the max current.
Operation Method:
4.2 Recall Function
Operation method: taking recalling the stored steady-state value in 99
As example.
7. Dynamic Test Function
Note: There are 6 seing functions in this mode: Dynamic CV, Dynamic CC,
Dynamic CR, Dynamic CW, Dynamic Pulse and Dynamic Flip. And this mode
has no storage function, so it can be only set rst and then run.
7.1 Dynamic CV, Dynamic CR, & Dynamic CW
Description: used for the dierent duty cycle output of 2 dierent volt
ages at a certain frequency.
Operation Method:
Taking the rst voltage lV, the second voltage 2V , the cycle frequency
lHZ and the duty cycle 40% as example; as for Dynamic CR and
Dynamic CW, just need to change the seing voltage into resistance or
power. And Dynamic CR selects mode 3 while Dynamic CW
selects mode 4.
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RND 320-KEL SeriesRND 320-KEL Series
7.2 Dynamic CC
Note: used for the dierent duty cycle output of 2 dierent currents at
a certain frequency.
Operation Method: taking it as example that the change slope of the rst
current is 0.00lA/Us, that of the second current is 0.002A/Us, the
rst current is lA, the second current is 2A, the cycle frequency is
lHZ and the duty cycle is 40%.
Remarks: Aer pressing ON/OFF to start, the LED display on the right
boom is the count running once.
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RND 320-KEL SeriesRND 320-KEL Series
Remarks: Aer pressing ON/OFF to start, the LED display on the right
boom is the count running once.
7.3 Dynamic Pulse
Note: It can at most set 10 groups of baery test parameters. According
to the set current, voltage, capacity and time, it tests the baery. And
the test will be turned o automatically once it meets any one of the
conditions.
Operation Description: taking it as example that the seing is saved in
group 1, the current range is lOA, the discharge current is lA, the
discharging end-o voltage is 2A, the discharging end-o capacity is
0.SAH and the discharging time is 200s.
Remarks: press ON/OFF to start and then the LED display on the right
boom is the count of triggers.
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RND 320-KEL SeriesRND 320-KEL Series
7.4 Dynamic Toggle
Note: Every time when receiving a trigger signal, the load will toggle
between the rst and second seing current.
Operation method: taking it as example that the change slope of the
rst current is 0.00lA/Us, that of the second current is 0.002A/Us, the
rst current is lA, and the second current is 2A.
8. Sequential Operation Function
8.1 Sequential Seing Function
Note: It can save 7 groups at most and every set it can at most set
84 dynamic currents. And the set current can be toggled in
sequence. Operation description: taking it as example that the
seing is saved in group 1, the max current is 4A,there are 3
dynamic currents, the rst dynamic current is lA, the change rate
is 0.00lA/us, the time is ls, the second dynamic current is 2A, the
change rate is 0.002A/us, the time is 2s, the rst dynamic current is
3A, the change rate is 0.003A/us, the time is 3S and the repetition
times is 5 times.
Remarks: press ON/OFF to start and then the LED display on the right
boom is the count of triggers.
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8.2 Sequence Recall Function
Note: recall one group of storage and use it.
Operation Description: recall the rst group of storage and use it.
RND 320-KEL SeriesRND 320-KEL Series
9. Baery Test Function
9.1 The Seing Function of the Baery Test
Note: It can at most set 10 groups of baery test parameters.
According to the set current, voltage, capacity and time, it tests the
baery. And the test will be turned o automatically once it meets any
one of the conditions.
Operation Description: taking it as example that the seing is saved
in group 1, the current range is lOA, the discharge current is lA, the
discharging end-o voltage is 2A, the discharging end-o capacity is
0.SAH and the discharging time is 200s.
Remarks: During the operation, once press Esc and it will exit the mode.
If there are some wrong entering, you can rotate the knob. When the
complete value appears, enter again.
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RND 320-KEL SeriesRND 320-KEL Series
9.2 The Recall Function of the Baery Test
Note: Recall one group of the storage and use it.
Operation Description: Recall the rst group of storage and use it.
Remarks: Press ON/OFF to start and then the LED display on the le boom
is the running time and the LED display on the right boom is the
consumption of capacity.
10. OCP Test Function
Note: when the voltage reaches the VON value, it will delay for some time,
and the current outputs; at intervals, the step value will decrease
progressively until it reaches the cut-o current, or the voltage is higher
than that set by OCP, and then the output ends. Aer that, if the voltage is
higher than the OCP voltage and meanwhile the current value is between
the maximum and the minimum set currents, it passes; otherwise, it fails.
10.1 Function of OCP Test Seings
Note: It can set at most 10 groups of test parameters.
Remarks: During the operation, once press Esc and it will exit the mode.
If there are some wrong entering, you can rotate the knob. When the
complete value appears, enter again.
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Operation description: taking it as example that the seing is saved in group
1, VON voltage is 10V, time delay of VON voltage is Ss, the current range is
3A, the beginning current is 2A, the step reduction value is 0.1A, the
reduction time is ls, the ending current is lA, OCP voltage is 8V, the maximum
current is 1.9A and the minimum current is 1.1A.
RND 320-KEL SeriesRND 320-KEL Series
Remarks: During the operation, once press Esc and it will exit the mode. If
there are some wrong entering, you can rotate the knob. When the
complete value appears, enter again.
Remarks: press ON/OFF to start and then the LED display on the right
boom is the count of triggers.
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10.2 The Recall Function of OCP Test
Note: recall one group of storage and use it.
Operation Description: recall the rst group of storage and use it.
RND 320-KEL SeriesRND 320-KEL Series
11.1 The Seing Function of OPP Test
Note: It can set at most 10 groups of test parameters. Operation
description: taking it as example that the seing is saved in group 1,
VON voltage is 10V, time delay of VON voltage is Ss, the current
range is 3A, the beginning power is 20W, the step reduction value is
lW, the reduction time is ls, the ending power is l0W, OPP voltage is
8V, the maximum power is 15W and the minimum power is 10W.
Remarks: press ON/OFF to start and then the LED display on the le boom
is whether it passes or not; and that on the right boom is the set current
value at present.
11. OPP Test Function
Note: when the voltage reaches the VON value, it will delay for some
time, and the power outputs; at intervals, the step value will decrease
progressively until it reaches the cut o power, or the voltage is higher
than that set by OPP, and then the output ends. Aer that, if the
voltage is higher than the OPP voltage and meanwhile the power value
is between the maximum and the minimum set powers, it passes;
otherwise, it fails.
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Enter th e beginning power 20W by
pressing t he k nob o r but tons a nd
then press “ ” to enter the nex t
parame ter settings.
Enter the step powe r 1W by pressin g
0.0000V 0.0000A
0V P0106
RND 320-KEL SeriesRND 320-KEL Series
11.2 The Recall Function of OPP Test
Note: recall one group of storage and use it.
Operation Description: recall the rst group of
storage and use it.
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the knob or but tons and then press
“ ” to en te r the next paramet er
settings .
Enter th e step re duction time 1s by
pressing t he k nob o r buttons a nd
then press “ ” to enter the next
parame ter settings.
Enter the ending p ower
pressing t he k nob or
but tons a nd
10W b y
then press “ ” to enter the nex t
parame ter settings.
Enter the OPP voltage 8V by
pressing the knob or buttons and
thenpres s “ ” to enter the next
0.0000V 0.0000A
0V P0107
0.0000V 0.0000A
0V P0108
0.0000V 0.0000A
0V P0109
0.0000V 0.0000A
0V P0110
Remarks: press ON/OFF to start and then the LED display on the
le boom is whether it passes or not; and that on the right boom is the
set power value at present.
parame ter settings.
12. External Trigger Function
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Enter th e maximu m powe r 15W by
pressing t he k nob o r but tons a nd
then press “ ” to enter the nex t
0.0000V 0.0000A
0V P0110
Note: Press Shi+CR to switch the external trigger function. Through
the remote control, the steady state mode can be opened; the test
mode of the dynamic state, the sequence operation mode and the
baery test mode can be triggered.
parame ter settings.
Remarks: when LED GRAP on the display lights on, it can be triggered
externally. And here there is the memory function, that is, the
trigger will be saved.
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Enter the minimum powe r 10W by
pressing the knob or butto ns and
then press “ ” to finish the
Return to the steady
stat e mode.
settings .
Remarks: During the operation, once press Esc and it will exit the mode.
If there are some wrong entering, you can rotate the knob.
When the complete value appears, enter again.
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RND 320-KEL SeriesRND 320-KEL Series
13. Remote Compensation Function
Note: Press Shi+CW to enter the switch of the remote
compensation function.
Remarks: When there is the remote compensation, the LED COMM will
light on. And there is no memory function.
14. Keyboard Lock Function
Note: Press Shi+ the keyboard will lock.
Remarks: Aer the keyboard is locked, only ON/OFF and Shi
are valid. And during the dynamic pulse mode and dynamic
toggling mode, the buon 3 is valid. There will be no memory function.
15. Baud Rate Seing Function
Note: Manually modify the baud rate.
Operation Description: changing the baud rate 57600 to
115200 as example.
16. Buzzer ON/OFF Function
Note: press Shi+ 1 to switch the buzzer on and o.
Remarks: there are memory function here.
17. Communication with PC
Please refer to the communication protocol.
Remarks: When the keyboard is not locked, press Esc at any time to
return to the steady state mode. From one mode switched to another
mode, press Esc to enter the steady state mode and then switch the
modes.
Remarks: please modify when there are no communications.
Here there is memory function.
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Specications
Note: The specications below are tested under the conditions of
temperature 25 °C +-5 °C and the warm-up for 20 minutes.
RND 320-KEL SeriesRND 320-KEL Series
MODELS
RND 320 KEL102
RND 320 KEL103
Note: Specications are subject to change without notice.
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RND 320-KEL Series
Distrelec Group AG
Grabenstrasse 6, CH-8606 Nänikon
www.distrelec.de
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