V/F Control - Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual

Troubleshooting

(2) V/F control

The motor does not rotate.
Are the charge lamp
on and the operation
panel LED indication given?
Is there no alarm output
to the operation panel?
Is the secondary side
wiring (U, V, W) of the
inverter correct without
open cables?
Is the start command
input?
Are the MRS and RES
signals both off?
Is reverse rotation
prevention (Pr. 78)
set to enable rotation
in the rotation direction?
When the
electromagnetic brake
is used, is the
electromagnetic
brake open?
N
Is the speed command
input?
Is an external command
used for the speed
command?
Apply a voltage to the analog
input terminals (across 2-5).
Also, to calibrate the No. 2
terminal, adjust the bias and
gain of the analog voltage
using Pr. 902 and Pr. 903.
Is operation performed
without using
communication?
Is any cable open?
Y
Are the station number and
so on set correctly?
Is the load light?
Y
Please contact your
sales representative.
N
Y
Y
Check the alarm definition,
N
remove the cause of the
alarm, and reset the inverter.
N
Perform wiring correctly.
Y
N
Control
Pr.800
Set Pr.800.
Y
N
PU: Press FWD (REV).
Y
External: Turn on STF (STR).
Also check that both
STF and STR are not on.
N
Turn off the MRS and
Y
RES signals.
Is the maximum
N
setting (Pr. 1)
other than 0?
Make the maximum
Y
setting correctly.
N
Set reverse rotation
Y
prevention (Pr. 78)
correctly.
N
Open the brake.
Y
Y
N
Set the speed from
Y
the PU.
N
Is an analog
input used?
Turn on the multiple speed
(*RH, RM, RL, REX).
*The terminal functions vary
with input terminal
assignment (Pr. 180 to Pr. 183,
Pr. 187).
N
N
Wire the cables correctly.
N
Make communication setting.
Y
Is the torque boost
setting low?
N
The load is excessive,
resulting in a motor lock status.
Lighten the load or increase
the motor and inverter capacities.
Are the operation panel
LED off and the charge
lamp on?
1) Contact fault of the operation panel
N 2) Control power is not supplied.
Are the operation panel
LED on and the charge
lamp off?
N
Are the earth leakage
breaker and magnetic
contactor on?
Y
Are the voltages of the
main circuit power
supply voltage terminals
(R, S, T) normal?
Y
Please contact your
sales representative.
Increase the torque boost.
(Do not increase it too high.
Doing so may cause the motor to
overheat. Increase it to about 10%.)
85
Y
(Check whether jumpers are connected
across R-R1 and S-S1.)
Y
1) The jumper across P-P1 or
DC reactor is disconnected.
2) Connect a jumper or DC reactor.
N
Turn on the earth
leakage breaker
and magnetic contactor.
N
Check for a low voltage,
phase failure, poor
connection or the like
and take corrective action.