BENSHAW RSi GM2 Series - Page 260

Maintenance
890054-00-00
250
GM2 Series VFD
Periodic Inspection Items (con’t)
Inspection
Item
Inspection
Period
Inspection
Method
Criterion
Customer
use
Monthly
1 Year
2 Year
Check/Initial
/Date
Non
-Powered VFD
Checks/Measurements
IGBT Module
Check the resistance
between each of the
terminals.
X
Disconnect the
VFD three
phase input
and measure
the resistance
between R, S,
T and P, N.
Refer to "How
to Check
Power
Components”
using Digital
or Analog
meter.
Input
Diode/SCR
Modules
Disconnect the
VFD three
phase output
and measure
the resistance
between U, V,
W and P, N.
DC Bus
Capacitors
Is there any visible
leakage coming out?
X
Visual check
Yes/No
Inspect the pressure
relief vent (or pin). Is
there any swelling or
rupture?
X
Motor (Note 1)
X
Megger Test
500 MΩ
Powered VFD
- Not Running
Checks/Measurements
Input Voltages
Is the input voltage
from the main within
spec of the VFD?
X
Measure the
voltage
between the
terminals R, S,
T.
VFD rating
+/-15%
Is the input voltage
from the main
balanced within spec
of the VFD?
X
2%
DC Bus
Voltage
Is the DC Bus Higher
or Lower than normal?
X
Measure the
DC Voltage
between the
Pos. and Neg.
terminals of
the VFD.
Input Voltage
x SQRT2
(+/- 10%)
Cooling Fan
Is there any abnormal
oscillations or noise?
X
Turn OFF the
power and turn
the fan by
hand.
Must rotate
smoothly.
Trip Circuit
(Input to VFD)
Is VFD trip circuit
funciotnal?
X
Identify the
VFD input trip
circuit. Open
or Close
external trip
mechanism.
VFD must trip.