Panasonic MINAS E-series - Manual (Page 146)

146
Troubleshooting
Protective
Functions
Overload
Protection
(OL)
*Regenerative
resistor
overload
protection
(REG)
*Encoder
communication
error
protection
Alarm
code No.
16
18
21
Cause
When an integration value of a torque command
exceeds the set overload level, overload protection
is activated based on time limiting characteristics.
(1) Operation lasted long with more load and
effective torque than rating.
(2) Oscillation or hunting operation due to poorly
adjusted gain. Vibration of the motor, and
abnormal sound.
(3) Incorrectly wired motor wires (U, V, W) and
disconnection.
(4) The machine collides, or suddenly gets heavy.
The machine is entangled.
(5) The electromagnetic brake keeps on running.
(6) When more than one driver is used, motor wire
is incorrectly connected to other axis.
Regenerative energy exceeds the capacity of the
regenerative resistor.
(1) The converter voltage increases due to energy
regenerated during deceleration resulting from
high load inertia. In addition, it further rises,
as the regenerative resistor cannot absorb
energy enough.
(2) Because of high rotation speed of the motor,
the regenerative resistor cannot absorb
regeneration within specified deceleration
time.
(3) The operating limit of the external resistor is
limited to 10% duty.
Due to communication breakdown between the
encoder and driver, the encoder cable
disconnection detecting function is activated.
<Caution>
If the above condition occurs before power-on, be
careful as the motor aut omatic recognition
abnormality protection (alarm code No.95) will be
activated when you power on again.
Action
On the waveform graphic screen of PANATERM ® ,
check if torque (current) waveform widely
oscillates up and down. Check load factor and
overload warning display.
(1) Increase the capacity of the motor and driver.
Extend acceleration/deceleration time.
Reduce load.
(2) Readjust gains.
(3) Connect motor wires as per the wiring
diagram. Replace cables.
(4) Free the machine of any tangle. Reduce the
load.
(5) Measure voltage of the brake terminal.
Release the brake.
(6) Correctly connect motor and encoder wiring to
eliminate a mismatch between the wires and axes.
Check the load factor of the regenerative resistor
in monitor mode. You must not use the driver for
the purpose of continuous damping of
regeneration.
(1) Check an operating pattern (waveform
graphic). Check the load factor of the
regenerative resistor and display of over-
regeneration warning. Increase capacity of
the motor and driver and slow down
deceleration time. Use an external
regenerative resistor.
(2) Check an operating pattern (waveform graphic).
Check the load factor of the regenerative resistor
and display of over-regeneration warning. Increase
capacity of the motor and driver and slow down
deceleration time. Reduce rotation speed of the
motor. Use an external regenerative resistor.
(3) Set Pr6c to 2.
Connect the encoder cable as per the wiring
diagram. Correct wrong connections of the
connector pins, if any.
Time (sec) Overload Protection Time-limiting Characteristics
100
100 115 150 200 250 300 350 400 450
Torque (%)
10
1
MUMA 50W, 100W
MUMA 200W, 400W
<Note> When you set Pr6C to 2, be sure to install an external safeguard such as a temperature
fuse, etc.
Otherwise, protection of regenerative resistor is lost, causing abnormal heat generation and
burnout of the regenerative resistor.