CDM Commissioning Guidance
T1689 Technical Manual Rev 07
Electrical Safety Tests
MV3000 Air Cooled DELTA
Page 132
6.3.4
Insulation Resistance Test
The insulation resistance should be measured and recorded before and after the High Voltage Insulation test.
The connections of each voltage group will be bonded together, and then connected to earth. Each group is
tested individually by removing its bond to earth (the other circuits remain connected to earth). After each
group is tested, the earth bond must be reconnected.
NOTE:
Lightning surge arrestors should be disconnected for the tests.
Test voltage = 1000 V
The resistance value is expected to be >500M
Ω
.
6.3.5
High Voltage Insulation Test
The connections of each voltage group will be bonded together, and then connected to earth. Each group is
tested individually – see Table 6–2 - by removing its bond to earth (the other circuits remain connected to
earth). After each group is tested, the earth bond must be reconnected.
NOTE 1: Use test voltages and periods that are required by the standards the drive system must adhere to. The test
voltages and periods quoted in Table 6–2 are MAXIMUM values and must not be exceeded.
NOTE 2: All high voltage insulation tests must be conducted using a test set that indicates the current, and whose
output is limited with a trip circuit to reduce the consequential damage should an insulation failure occur.
NOTE 3: Lightning surge arrestors should be disconnected for the tests.
Test Group
Procedure
Maximum
Test Voltage
Maximum
Duration
A
≥690 V a.c.
or
480 V a.c.
•
Connect groups B, C and D to group E (earth);
•
Close or short circuit the main breaker;
•
Remove control connections to the DELTA transistor and
rectifier modules;
•
Disconnect the SMPS units;
•
Disconnect the MVM module (if fitted);
•
Disconnect the earth connection to the DVDT filter (if
fitted);
•
Connect the insulation test set output to group A;
•
Connect the insulation test set output to group E.
3.1 kV dc
or
2.8 kV dc
60 s
B
400 – 480 V a.c.
•
Connect groups A, C and D to group E (earth);
•
Close or short circuit any breakers necessary to make these
connections;
•
Connect the insulation test set output to group B;
•
Connect the insulation test set output to group E.
2.8 kV dc
60 s
C
110 / 230 V a.c.
•
Connect groups A, B and D to group E (earth);
•
Close or short circuit any breakers necessary to make these
connections;
•
Remove any transformer Centre Tap Earth connections;
•
Connect the insulation test set output to group C;
•
Connect the insulation test set output to group E.
2.5 kV dc
60 s
D
<30 V a.c. /
< 50 V d.c.
•
Connect groups A, B and C to group E (earth)
•
Connect the insulation test set output to group D;
•
Connect the insulation test set output to group E.
140 V d.c.
60 s
Table 6–2. – Insulation Test Guidance
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