Chapter 10 Troubleshooting
: Encoder output error
Potential Cause Checking Method Corrective Actions
Encoder itself or the
wiring of encoder is
in error.
Check if the recent fault records (P4-00 ~
P4-05) display on the drive keypad in
accordance with the fault codes AL011,
AL024, AL025 and AL026.
Perform the corrective actions
as described in AL011, AL024,
AL025 and AL026.
The output
frequency for pulse
output may exceed
the limit of its
allowable setting
value.
Check if the following conditions occur:
Condition 1: Motor speed is above the
value set by P1-76.
Condition 2:
6
1019.8 4 461P
60
Speed Motor
Correctly set P1-76 and P1-46.
1. Ensure that the motor speed
is below the value set by P1-
76.
2.
6
1019.8 4 461P
60
Speed Motor
: Serial communication error
Potential Cause Checking Method Corrective Actions
Communication
parameter setting is
defective.
Check the communication parameter
setting.
Correctly set parameter
setting.
Communication
address is incorrect.
Check the communication address.
Correctly set communication
address.
Communication
value is incorrect.
Check the communication value.
Correctly set communication
value.
: Serial communication time out
Potential Cause Checking Method Corrective Actions
Setting value in time
out parameter is not
correct.
Check communication time out
parameter setting.
Correctly set P3-07.
Not receiving
communication
command for a long
time.
Check whether communication cable is
loose or broken.
Tighten the communication
cable, make sure the
communication cable is not
damaged and ensure all wiring
is correct.
: Reserved
: Input power phase loss
Potential Cause Checking Method Corrective Actions
Control power
supply is in error.
Check the power cable and connections
of R, S, T. Check whether the power
cable is loose or the possible loss of
phase on input power.
If the fault does not clear even
when the three-phase power is
connected correctly, please
contact your distributor for
assistance or contact with
Delta.
10-12 Revision January 2011
Call 1(800)985-6929 for Sales
Call 1(800)985-6929 for Sales
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