Troubles That Are Not Displayed By Led Readout; No Alarm Display Appears, But Motor Does Not Start - Mitsubishi FREQROL-SFJ Maintenance Manual

8.5.1 Troubles that are not displayed by LED readout

(1) No alarm display appears, but motor does not start . . . .

Cause
Miswiring or
wire disconnec-
tion
Input power
supply (volt-
age) improper
Control power
supply improper
Required signal
not input
Speed reference
signal remains
zero.
Checkup
Check the wiring.
Check the input power sup-
ply (2OOV 50Hz or 200 -
230V 60Hz in all 3 phases).
Measure the control power
supply voltage, using a
multimeter and check pins.
Check if contactor closes
[click arises when con-
Check that start signal
(SRN, SRI or ORC) is in-
put within 1 sec. after
Rotate motor shaft to make
sure motor is under "servo
lock" condition.
1. Signals SRN and SRI turn
on at the same time.
2. "slimit" or "smax" (NC
display parameter) is
set at "0".
3. "Analog/digital select"
signal is on.
4. Signal input interface
(open collector, emitter)
does not meet parameter
Remedv
Correct or remedy
the wiring.
Use the specified
power supply.
Replace card IM-PW2.
Input "ready" signal.
Signal input sequence
should be changed so
that start signal is
input in 2 - 3 sec.
after "ready" signal
turns on.
Change the program
so that SRN and
SRI do not turn on
at the same time.
2. Set "siimit" and
Turn off "analog/
3.
digital select"
signal.
4. Set parameter
meets signal input