Chapter 7 Checking and Troubleshooting
G
7-5
Type Description
Enc Conn
Check
An alarm is signified if No. 3 Enc Test is selected from BAS-20 Auto
Tuning and no signal is input during the encoder test. Signals are
released if ENC Tune is set among the functions of OUT31~33.
Enc Dir
Check
An alarm is signified if No. 3 Enc Test is selected from BAS-20 Auto
Tuning and the setting is wrongly changed between encoder phase A
and B during the encoder test or the rotation direction is reverse.
Signals are released if ENC Dir is set among the functions of
OUT31~33.
Lost Keypad
An alarm is signified if the operating command is keypad or any
problem is detected with the communication between the keypad and
the main body of the inverter in Keypad JOG Mode with PRT-11 Lost
KPD Mode set 0. As the output signal, No. 29 Lost Keypad is selected
among the functions of OUT31~33.
Check Line
PLZ
An alarm is signified if the communication error is detected between
Control CPU and Keypad. It might be occurred from the connection
cable between Control CPU and Keypad.
Fire Mode
When fire function is activated, the alarm signal will occur. If you need
a contact signal ouput, you will select OUT31~33 Fire Mode function.
7.1.3 Troubleshooting
G
Type Cause of Trouble Solution
Over Load
The load is higher than the rated
load of the motor.
The load set at the overload
failure level (PRT-21) is small.
Raise the capacity of the motor
and inverter.
ත Increase the set value.
Under Load
There is a problem with the
connection between the motor
and load.
The underload level (PRT-29, 30)
is lower than the minimum
system load.
Raise the capacity of the motor
and inverter.
ත Increase the set value.
Over
Current1
Acc/Dec time is too short
compared with the inertia of the
load (GD
2
).
The load of the inverter is bigger
than its rated load.
Inverter output is ON during idling
of the motor.
Raise the Acc/Dec time.
ත Replace the inverter for one with
bigger capacity.
ත Operate the inverter after the
motor stops or use speed
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