106 • Test Procedure for Low Voltage Testing
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12. TEST PROCEDURE FOR LOW VOLTAGE TESTING
12.1 Accessories Required for LOW VOLTAGE Testing of the Starter and Cabinet.
Control cable – three wires (two wires+ground) and a switch, to connect the control voltage (110VAC,
230VAC, 115VDC, 125VDC or 220VDC).
Note: Rated power of the control power source should be 2.5kW minimum. This will ensure all inrush
current to the HRVS-DN will not cause voltage drop to the control circuitry.
Power cable - four wires (3 phase + ground) cable + fused three phase switch, to connect the low voltage
400VAC three phase mains voltage to the cabinet. Prepare one side of the cable with a connector to the
mains voltage according to the type of connectors used in the field. The other side with cable lugs or, more
conveniently, with adequate alligator clips suit the bus bar size.
Note
: If low voltage mains is generated by a step up or step down transformer, its kVA should be 10 times
greater than the testing motor kVA. Otherwise, the mains (low) voltage may be heavily distorted and
prevent proper operation of the soft starter.
Start / Stop toggle switch with 2 wire cable, to simulate the remote Start / Stop contact.
Three phase 400VAC induction motor 5 -10KW. The motor should be loaded by a fan or any other kind of
inertia (fly wheel). Note that test motor rated current should follow the rule:
<test motor FLA X gain > 40% STARTER FLC>. (see here after information on gain settings)
Digital multimeter.
Test Harness with three colored wires (supplied with the cabinet, located in a small plastic bag in the
drawings pocket).
Note
: Test harnesses for other than 400VAC (in the range of 440VAC to 690VAC) can be ordered. The
test voltage (if other than the standard 400V), is indicated on the tape of the test harness.
12.2 Notes and Warnings
Notes
:
The starter and the cabinet are designed to ensure a complete, convenient and safe test procedure for the
starter and for the cabinet, using only the above accessories.
The next procedure should be used for the following:
o To ensure that the unit functions properly.
o To learn the operational modes and options of the cabinet.
o To test the cabinet together with the external control system (Factory Scada system, external
PLC, etc.) It is strongly recommended to perform as many tests as possible in the low voltage
mode to debug the external control system hardware and software in this low voltage mode
until the entire system operates satisfactorily.
o To debug the system in a rare event of a problem in the starter, cabinet or control system.
WARNING!
Make sure that Medium voltage is disconnected and secured.
Check that the test control voltage is equal to the rated control voltage.
Immediate damage can be expected if the control voltage level is incorrect.
Check that the three phase mains testing voltage is equal to 400VAC, which is
the standard testing voltage. An immediate damage can be expected if the
mains voltage is not 400VAC±10%.
Read the soft starter instruction manual carefully as well as the optional Motor
Protection Relay (MPR) instruction manual, If installed.
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