MV510 series high-voltage inverter maintenance manual
11
circuit?
abnormalities.
Relay
Is
there
any
high
frequency
vibration
when moving?
Is the timer's operating
time normal?
Is the contact loose?
Circuit board
Is there any smell or
discoloration?
Is the power supply
normal?
Are the screws and bolts
loose?
Operator
Is the screen displayed
correctly?
Is
the
operation
department dirty?
Switch
Is the switch action
normal?
Cooling
system
Door filter
Is it dirty or clogged?
Visual inspection:
no damage, no
pollution,
no
abnormalities.
Cooling fan
Are there any abnormal
sounds and vibrations?
Is the bearing normal?
Please perform regular inspection as follows.
■
Inspection with megohmmeter (insulation resistance measurement)
Insulation resistance measurement on the primary side of the inverter
Please use a 2500V megohmmeter.
The acceptance criteria are 1000 MΩ or more.
Since the grounding is performed with a high resistance detected by the input
voltage, remove the voltage detection resistor and measure it.
The steps are as follows:
Step 1: Disconnect the cable at VFD input(R,S,T), and disconnect the ground
wire of the input voltage detection board.
Step 2: Stay away from the test points.
Step 3: Connect the positive pole of the megohmmeter to VFD input (R phase)
terminal, and the negative pole to ground (the main grounding copper
bar of the inverter).
Step 4: Measure continuously for 1 min and record test result.
Step 5: Repeat Step 3 and Step 4 for S phase and T phase.
After the measurement is completed, recover to connect cables for R,S,T
input cables and the ground wire of input voltage detection board.
Please refer to the picturess shown in Figure 2-3-1.
