YASKAWA SGM Series User Manual page 272

Maintenance and Inspection
12.2.2 SERVOPACKS
Alarm Code
(Alarm/warning History)
"F1"
Power supply line not
connected
Note The alarm code "00" is reset by turning OFF the encoder power supply (by transferring SENS_OFF command)
or by transferring ALM_CLR command
12
Symptom
Motor will not run with refer-
ence input
Symptom
Poor servo tracking performance
Status When Lit
At main circuit power supply
turn ON
J Problems due to Defective Wiring or Parts
Table 12.7 Problems due to Defective Wiring or Parts
Check Areas and Items
Check voltage between R, S and T.
Make sure the alarm indicator is not lit.
Check the N-OT and P-OT signals.
Check SERVOPACK status using the status monitor
command SMON.
J Problems due to Setting Errors
Table 12.8 Problems due to Setting Errors
Cause
Position loop gain too low
Cause
One phase (R, S, or T) of the main
circuit power is not connected to the
power supply.
Line voltage of one of the phases is
low.
SERVOPACK defective.
Check the AC power supply circuit.
Look for a cause if an indicator is lit.
Increase the position loop gain (Cn-001A). Decrease the
speed loop gain when increasing position loop gain
causes hunting.
Note Do not increase the position loop gain any
higher once hunting occurs. This is the tracking
performance limit.
12 -10
Remedy
Check the power supply.
Check main circuit power sup-
ply wiring.
MCCB or noise filter
Check the electromagnetic con-
tactor.
Check the power supply.
Replace SERVOPACK.
Remedy
Remedy