Troubleshooting For Malfunction Without Alarm Display - YASKAWA E-II Series User Manual

10 Inspection, Maintenance, and Troubleshooting

10.1.6 Troubleshooting for Malfunction without Alarm Display

10.1.6 Troubleshooting for Malfunction without Alarm Display

The troubleshooting for the malfunctions that causes no alarm display is listed below.
Contact your Yaskawa representative if the problem cannot be solved by the described corrective actions.
Symptom
Servomotor
The power supply is not ON.
Does Not
Start
Wrong wiring or disconnection of
I/O signal connector CN1
Servomotor or encoder wiring dis-
connected.
Overloaded
Speed/position references not input
Setting for Pn50A to Pn50D "Input
Signal Selection" is incorrect.
Encoder type differs from parameter
setting.
/S-ON input signal stays OFF.
/P-CON input function setting is
incorrect.
SEN input is turned OFF.
Reference pulse mode selection is
incorrect.
The error clear counter (CLR) input
is turned ON.
The forward run prohibited (P-OT)
or reverse run prohibited (N-OT)
input signal is turned OFF.
A SERVOPACK fault occurred.
Servomotor Servomotor wiring is incorrect.
Moves In-
Encoder wiring is incorrect.
stantaneous-
ly, and then
Stops
Servomotor An alarm occurred while alarm reset
Suddenly signal (/ALM-RST) was turned ON.
Stops during
Operation
and will Not
Restart
Servomotor Wiring connection to servomotor is
Speed Unsta- defective.
ble
Servomotor Speed control: Speed reference input
Rotates With- is incorrect.
out Refer-
Torque control: Torque reference
ence Input
input is incorrect.
Speed reference offset is error.
Position control: Reference pulse
input is incorrect.
A SERVOPACK fault occurred.
DB (dynamic Improper parameter setting
brake) Does
DB resistor disconnected
Not Operate
DB drive circuit fault
10-16
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Table 10.7 Troubleshooting for Malfunction without Alarm Display
Cause
Check voltage between power supply termi-
nals.
Check if the connector CN1 is properly
inserted and connected.
Check the wiring.
Run under no load.
Check reference input pins.
Check settings of parameters Pn50A to
Pn50D.
Check incremental or absolute encoder.
Check settings of parameters Pn50A.0 and
Pn50A.1.
Check parameter Pn000.1.
Check the SEN signal input (when absolute
encoder is used).
Check the parameter setting for the refer-
ence pulse mode.
Check CLR input pins.
Check P-OT or N-OT input signal.
−
Check the servomotor wiring.
Check the encoder wiring.
Check /ALM-RST signal.
Check connection of power lead (phases U,
V, and W) and encoder connectors.
Check V-REF and SG to confirm if the con-
trol method and the input are agreed.
Check T-REF and SG to confirm if the con-
trol method and the input are agreed.
−
Set the parameter and cheek the reference
pulse form.
−
Check the setting of parameter Pn001.0.
Check if excessive moment of inertia,
motor overspeed, or DB frequently acti-
vated occurred.
−
Inspection
: Turn OFF the servo system before executing operations.
Correct the power circuit.
Correct the connector CN1 connection.
Connect the wiring.
Reduce load or replace with larger capacity servomotor.
Input speed/position references correctly.
Correct the settings for Pn50A to Pn50D "Input Signal
Selection."
Set parameter Pn002.2 to the encoder type being used.
Correct the parameter setting and turn ON /S-ON input
signal.
Set parameters to match the application.
Turn SEN input signal ON.
Correct setting of parameter Pn200.0.
Turn CLR input signal OFF.
Turn P-OT or N-OT input signal ON.
Replace the SERVOPACK.
Correct the servomotor wiring.
Correct the encoder wiring.
Remove the cause of alarm. Turn alarm reset signal
(/ALM-RST) from ON to OFF.
Tighten any loose terminals or connectors.
Correct the control mode selection parameter, or the
input correctly.
Correct the control mode selection parameter, or the
input correctly.
Adjust the SERVOPACK offset correctly.
Correct the control mode selection parameter, or the
input correctly.
Replace the SERVOPACK.
Correct the parameter setting.
Replace the SERVOPACK, and reconsider the load.
Replace the SERVOPACK.
Corrective Actions