GE VAT20 Series Instruction Manual page 41

(1). Motor inoperative
YES
t breaker (MCCB)
Can you switch ON the
L1-L2 power input terminals
Is Power LED off ?
switch on the RUN
any output voltage on
motor T1-T2-T3?
output voltage in balance
Is the circui
switched ON?
NO
MCCB?
Is the
voltage between
normal?
Normal
(within +/- 10% of nominal value)
Is the operation
position?
YES
Is there
Is the
T1-T2,T2-T3,T3-T1
condition?
YES (When the motor is not connected, and the voltoge differences between
wires are within +/- 3% can be treated as in balance condition.)
Motor over-load
Defective motor
Poor wiring
Can not
Wiring short-circuit
• Power source
ABNORMAL
abnormality
• Poor wiring
NO
VAT20 malfunction
Place the operation
NO
switch to RUN
NO
VAT20 malfunction
NO
VAT20 malfunction
39
position.