Specifications

8
8. TROUBLESHOOTING
8– 13
8-2-3 Warnings
If a warning occurs, the servo amplifier does not go into a servo off status. However, if operation is
continued in the warning status, an alarm may occur or proper operation not performed. Eliminate
the cause of the warning according to this section. Use the optional set-up software to refer to the
cause of warning.
Name Definition ActionCause
Open battery
cable warning
Absolute position detection
system battery voltage is low.
1. Battery cable is open. Repair cable or change
battery.
2. Battery voltage dropped to 2.8V
or less.
Checking method
Call the status display and
check regenerative load ratio.
Change battery.
Zero setting error 1. For incremental, return to
origin point could not be
performed.
2. For absolute position
detection system, origin
point setting could not be
performed.
1. Command pulses were input
after droop pulses had been
cleared.
Make provisions so that
command pulses are
not input after droop
pulses are cleared.
Battery warning Absolute position detection
system battery voltage is low.
Battery voltage dropped to 3.2V
or less.
Change battery.
Excessive regen-
erative load warn-
ing
There is a possibility that rege-
nerative power may exceed
permissible regenerative power
of built-in regenerative brake
resistor or regenerative brake
option.
Regenerative power increased to
85% or more of permissible rege-
nerative power of built-in regene-
rative brake resistor or regenerat-
ive brake option.
1. Reduce frequency
of positioning.
2. Change regenerative
brake option for the
one with larger
capacity.
3. Reduce load.
Cause, checking method
Refer to A. 50, 51.
Overload warning There is a possibility that over-
load alarm 1 or 2 may occur.
Load increased to 85% or more of
overload alarm 1 or 2 occurrence
level.
Refer to A. 50, 51.
Absolute position
counter warning
Absolute position encoder
pulses faulty.
1. Noise entered the encoder. Take noise suppress-
ion measures.
2. Encoder faulty. Change servo motor.
ABS time-out
warning
1. Programmable controller's
ladder program error
Correct program.Absolute position data transfer
fault
2. Mis-wiring of CN1B-9 pin,
CN1B-6 pin
Connect correctly.
Servo emergency
stop
External emergency stop was
made valid. (EMG-SG were
opened.)
After ensuring safety,
reset emergency stop.
EMG-SG are open.
Main circuit off
warning
Servo on signal (SON) was
switched on with main circuit
power off.
Switch on main circuit
power.
Servo on signal (SON) was
switched on with main circuit
power off.
Display
A. 92
A. 96
A. 9F
A. E0
A. E1
A. E3
A. E5
A. E6
A. E9
A. EA ABS servo on
warning
1. Programmable controller's
ladder program error
Correct program
2. Mis-wiring of SON signal Connect correctly.
2. Droop pulses remaining are
greater than in-position range
setting.
3. Creep speed is high.
Reduce creep speed.
Servo on signal (SON) was not
switched on within 1s after
servo amplifier went into
absolute position data transfer
mode.