User Manual Of EL7-EC** AC Servo
273
Error
code
Main Sub
Display: “
Er 102”
10
2
Content: Motor rotor blocked
Cause
Diagnosis
Solution
Motor rotor
blocked
Look for mechanical blockages
Check the machinery
Motor rotor
blocking time
threshold value
too low
Verify value of Pr6.57
Adjust value of Pr6.57
Error
code
Main Sub
Display: “
Er 120”
12
0
Content: Regenerative resistor overvoltage
Cause
Diagnosis
Solution
Regenerative energy
exceeded capacity of
regenerative resistor
1. Verify if velocity is too
high
2. Verify if load is too large
1. Decrease motor rotational velocity;
2. Decrease load inertia;
3. Add an external regenerative resistor;
Power supply voltage
too high
1. Verify if power supply
voltage is within the rated
range.
2. Interval regenerative
resistor value is too low
1. Decrease power supply voltage
2. Increase regeneration resistance
value(add external regenerative resistor)
Unstable power supply
voltage
Verify if power supply
voltage is stable
Add a surge suppressor to main power
supply.
Regenerative energy
discharge circuit
damaged
/
1. Add an external regenerative resistor;
2. Replace driver
Error
code
Main Sub
Display: “
Er 121”
12
1
Content: Holding brake error
Cause
Diagnosis
Solution
Holding brake circuit
damaged
Regenerative resistor
disconnected
Replace regenerative resistor
Holding brake IGBT
damaged
Replace driver
Error
code
Main Sub
Display: “
Er 122”
12
2
Content: Regenerative resistor value too low
Cause
Diagnosis
Solution
External regenerative
resistor value is less
than the minimum value
allowed by the drive
/
Replace the regenerative resistor with the
right resistance value which meets the
specification of the driver
