Troubleshooting Malfunction Based On Operation And Conditions Of The Servomotor - YASKAWA E-V Series User Manual

8 Troubleshooting
8.3
Troubleshooting Malfunction Based on Operation and
Conditions of the Servomotor
Troubleshooting for the malfunctions based on the operation and conditions of the servomotor is provided in
this section.
Be sure to turn OFF the servo system before troubleshooting items shown in bold lines in the table.
Problem
Linear
Servomotor Does
Not Start When
Using JOG
Operation and
Host Reference.
Linear
Servomotor Starts
in JOG Operation
but Does Not Start
by Host
Reference.
Linear
Servomotor
Moves
Instantaneously,
and then Stops
Linear
Servomotor
Speed Unstable
8-26
Probable Cause
The control power supply is not
ON.
The main circuit power supply is
not ON.
Wrong wiring or disconnection of I/
O signal connector CN1
Linear servomotor or serial con-
verter unit wiring disconnected.
The polarity detection is not exe-
cuted.
A SERVOPACK fault occurred.
The SERVOPACK enters a hard
wire baseblock state.
Overloaded
Speed/position references not input Check reference input pins.
Setting for Pn50A to Pn50D "Input
Signal Selection" is incorrect.
The forward run prohibited (P-OT)
or reverse run prohibited (N-OT)
input signal is turned OFF.
Servomotor wiring is incorrect.
Serial converter unit wiring is incor-
rect.
Linear scale wiring is incorrect.
Linear scale pitch (Pn282) is incor-
rect.
Linear scale counting up direction
and linear servomotor coil assembly
forward direction do not agree.
Polarity detection is not performed
correctly.
Wiring connection to servomotor is
defective.
Investigative Actions
Check voltage between control
power supply terminals.
Check the voltage between power
supply terminals.
Check if the connector CN1 is prop-
erly inserted and connected.
Check the wiring.
Check the parameter Pn080.
Check /S-ON or /P-DET input sig-
nal.
Check if the SERVOPACK board is
damaged.
Check if the connector CN8 is prop-
erly inserted and connected.
Run under no load.
Check settings of parameters
Pn50A to Pn50D.
Check P-OT or N-OT input signal.
Check the servomotor wiring.
Check the serial converter unit wir-
ing.
Check the linear scale wiring.
Check the setting of Pn282.
Check the directions.
Check if the value of Un004 (Elec-
trical Angle 2, angle from 0 (zero)
degree of phase-U) at an arbitrary
position is between ±10 degrees.
Check connection of power lead
(phases U, V, and W) and encoder
connectors.
Corrective Actions
Correct the control power circuit.
Correct the power circuit.
Correct the connector CN1 connec-
tion.
Correct the wiring.
Correct the setting of Pn080.
• When using an incremental linear
scale, turn ON
/S-ON or /P-DET input signal.
• When using an absolute linear
scale, turn OFF external /S-ON
input signal and execute Fn080.
Replace the SERVOPACK.
Correct the connector CN8 connec-
tion.
Reduce load or replace with larger
capacity servomotor.
Input speed/position references cor-
rectly.
Correct the settings for Pn50A to
Pn50D "Input Signal Selection."
Turn P-OT or N-OT input signal
ON.
Correct the servomotor wiring.
Correct the serial converter unit
wiring.
Correct the linear scale wiring.
Correct the setting of Pn282.
Change the setting of Pn080.1
(Motor Phase Selection).
Match the linear scale direction and
coil assembly direction.
Correct the settings for the polarity
detection related parameter.
Tighten any loose terminals or con-
nectors.