Mitsubishi FREQROL-SFJ - 8.5.1 Troubles that are not displayed by LED readout

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-
tactor is closed).
Check that start signal
(SRN, SRI or ORC) is in-
put within 1 sec. after
"ready"
signal is input.
Rotate motor shaft to make
sure motor is under "servo
lock"
condition.
1. Signals SRN and SRI turn
on at the same time.
Remedv
I
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
Correct or remedy -
1
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.
_.__-__ --.-
1.
2.
3.
4.
Change the program
so that SRN and
SRI do not turn on
at the same time.
Set
"siimit" and
I'smax" properly.
Turn off "analog/
digital select"
signal.
Set parameter
lBSL/ (#42) that i
meets signal input
;
1
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