User Manual Of EL7-EC** AC Servo
278
Error
code
Main Sub
Display: “
Er 1A1”
1A
1
Content: Velocity out of control
Cause
Diagnosis
Solution
Motor velocity
out of control,
Excessive
velocity error
Verify encoder phase sequence; Verify if UVW
cable is connected to the right terminal
Reconnect UVW if wrongly
connected. If still remains
unsolved, please contact
technical support.
Error
code
Main Sub
Display: “
Er 1b0”
1b
0
Content: Bus input signal dithering
Cause
Diagnosis
Solution
Controller
synchronization
dithering
/
Increase alarm threshold value
Error
code
Main Sub
Display: “
Er 1b1”
1b
1
Content: Incorrect electronic gear ratio
Cause
Diagnosis
Solution
Values out of range
Numerator or
denominator is zero/Set
values out of range
Reduce number of pulses per revolution
Error
code
Main Sub
Display: “
Er 1c0”
1c
0
Content: Both STO failed
Cause
Diagnosis
Solution
Both STO input signals
valid
Verify if STO power supply
is normal
Verify 24V STO power supply and power
cable connection
Disconnect switch
connected to STO
Close switch
Error
code
Main Sub
Display: “
Er 1c1”
1c
1
Content: 1st STO failed
Cause
Diagnosis
Solution
1st STO input signal
valid
Verify if STO power supply
is normal
Verify 24V STO power supply and power
cable connection
Disconnect switch
connected to STO
Close switch
Error
code
Main Sub
Display: “
Er 1c2”
1c
2
Content: 2nd STO failed
Cause
Diagnosis
Solution
2nd STO input signal
valid
Verify if STO power supply
is normal
Verify 24V STO power supply and power
cable connection
Disconnect switch
connected to STO
Close switch