YASKAWA SERVO Manuel d'utilisateur Page 199

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9.3 Troubleshooting Malfunction Based on Operation and Conditions
9-27
9
Troubleshooting
Linear Scale
Position
Difference Error
(The position
saved in the host
controller when
the power was
turned OFF is
different from the
position when the
power is next
turned ON.)
Noise interference due to improper
linear scale connection cable speci-
fications
The specifications of linear scale
connection cables must be:
Shielded twisted-pair or shielded
multi-core twisted-pair wire with
core 0.12 mm
2
min. and tinned
annealed copper twisted wire.
Use the specified linear scale con-
nection cables.
Noise interference due to length of
linear scale connection cables
Check the length of linear scale
connection cables.
The maximum length of linear scale
connection cables:
20 m for the cable for connecting a
serial converter unit
15 m for the cable for connecting a
linear scale/hall sensor
Noise interference due to damaged
linear scale connection cables
Check if any of the linear scale con-
nection cables is bent or if its
sheaths are damaged.
Replace the linear scale connection
cables and correct their layout.
Excessive noise interference at the
linear scale connection cables
Check if any of the linear scale con-
nection cables is bundled with a
high-current line or near high-cur-
rent line.
Correct the linear scale connection
cable layout so that no surge from
high-current lines is applied.
FG potential varies because of
influence of machines such as weld-
ers at the servomotor.
Check if the machines are correctly
grounded.
Ground machines correctly, and
prevent diversion to the FG at the
linear scale side.
SERVOPACK pulse counting error
due to noise interference
Check if there is noise interference
on the input/output signal line from
the serial converter unit.
Take measures against noise in the
serial converter unit wiring.
Excessive vibration and shock to
the serial converter unit
Check if vibration from the machine
occurred or the serial converter unit
installation is incorrect (mounting
surface accuracy and fixing).
Reduce vibration from the machine,
or secure the serial converter unit
installation.
A serial converter unit fault
occurred.
Replace the serial converter unit.
A linear scale fault occurred. Replace the linear scale.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Host controller serial data reading
error
Check the error detection section at
the host controller.
Correct the error detection section
of the host controller.
Check if the host controller is exe-
cuting data parity checks.
Execute a serial data parity check.
Check for noise in the input/output
signal line between the SERVO-
PACK and the host controller.
Take measures against noise, and
again execute a serial data parity
check.
Overtravel (OT)
Forward or reverse run prohibited
signal is input.
Check if the voltage of input signal
external power supply (+24 V) is
correct.
Correct external power supply (+24
V) voltage.
Check if the overtravel limit switch
operates properly.
Correct the overtravel limit switch.
Check if the overtravel limit switch
is connected correctly.
Correct the overtravel limit switch
wiring.
Check the settings for PnB0F and
PnB10.
Set the parameters correctly.
Forward or reverse run prohibited
signal is malfunctioning.
Check the fluctuation of the input
signal external power supply (+24
V) voltage.
Stabilize the external power supply
(+2
4 V) voltage.
Check if the overt
ravel limit switch
operates correctly.
Stabilize the operation of the over-
travel limit switch.
Check if the overtravel limit switch
wiring is correct. (check for dam-
aged cables or loosen screws.)
Correct the overtravel limit switch
wiring.
(cont’d)
Problem Probable Cause Investigative Actions Corrective Actions
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