Error Excess Speed - Mitsubishi FREQROL-SFJ Maintenance Manual

Cause
Trouble with
encoder. or encoder fed back from encoder,
cable
Error in parameter Although the control sys-
setting
Card trouble
This alarm occurs if deviation of true motor speed from
the specified speed is larger than 500rpm, lasting for
12' sec. or longer.
Cause
Motor wiring im-
proper (phase
sequence failure
Error in parameter "Motor constant" parameter
setting
large
Checkup
Check waveform of signal
using a synchroscope
Card SF-ORJ
Card SF-DAJ
Card SF-TLJ
oriented spindle stop
function, parameter
OSL
After making sure this
alarm is reproducible, re-
place the cards SF-ORJ,
DAJ and TLJ to check.
Motor cable connection
(U, V and W) is not cor-
MSL (#2) setting does not setting.
meet the motor used.
It takes more than 6 sec.
for acceleration to the
maximum motor speed from
zero speed.
Remedy
Replace the defecti-
ve encoder or cable.
Set parameter I
Replace the card
SF-ORJ, DAJ and/or
TLJ.
Remedv
Connect the motor
cable in correct
phase sequence.
Change parameter
Increase setting of
parameter /?ZZK]