8.4 Troubleshooting for Malfunction without Alarm Display
153
The emer-
gency stop
function does
not operate.
The switch for the external
emergency stop input is
faulty or incorrect wiring.
Check the switch for the
external emergency stop
input or wiring.
Repair the switch for the
external emergency stop
input switch or correct the
wiring.
Emergency stop input signal
(E-STP) is set to be dis-
abled.
Check the parameter
Pn515.2 setting.
Correct the parameter
Pn515.2 setting.
The SERVOPACK is faulty.
The SERVOPACK board is
faulty.
Replace the SERVOPACK.
Abnormal
noise from the
servomotor, or
vibration from
the coupled
machine
Incorrect mechanical instal-
lation
Check if the servomotor
mounting screws are not
loose.
Retighten the mounting
screws.
Check if the coupling is mis-
aligned.
Aligh the coupling.
Check if the coupling is well
balanced.
Adjust and balance the cou-
pling.
Defective bearing
Check for noise and vibra-
tion around the bearing.
If any abnormality is found,
contact your Omron
Yaskawa representative.
Vibration source in the cou-
pled machine
Check if there is no foreign
matter, damage, deforma-
tion, or looseness in the
machine movable section.
Consult the machine manu-
facturer and repair.
Noise interference because
of incorrect specifications of
encoder cable
Check if twisted pair
shielded wires with core of
0.12 mm
2
are used.
Use the specified encoder
cable.
Noise interference because
the encoder cable wiring
distance is out of the specifi-
cations range.
Check the encoder cable
length.
The encoder cable wiring
distance must be 20 m max.
Noise interference on the
signal line because the
encoder cable is pinched/
bent or its sheath is dam-
aged.
Check if the encoder cable
is not damaged.
Modify the encoder cable
layout.
Excessive noise interfer-
ence to the encoder cable
Check if the encoder cable
is not bundled with or too
closed to high voltage lines.
Change the encoder cable
layout so that no surge volt-
age is applied.
FG potential varies by influ-
ence of machines such as
welder installed on the ser-
vomotor side.
Check if the machine is cor-
rectly grounded (check for
faulty grounding).
Ground the machine sepa-
rately from PG side FG.
(cont’d)
Malfunction
Cause
Inspection
Corrective Actions
TOEP_C710806_03A_1_0.book Seite 153 Montag, 2. Juli 2007 3:55 15
