Errors Without Alarm Display And Troubleshooting - Siemens YASKAWA 840DI Maintenance Manual

3.2 Errors without alarm display and troubleshooting

3.2

Errors without alarm display and troubleshooting

The table below shows the causes and their remedies for the malfunctions accompanied with
no alarm generation.
Before you check or take a remedy for what is described in the half-tone meshing column,
you must turn off the power supply of Drive Unit.
Malfunction
Motor does not start. The power supply is
not turned on.
Connection is loose
between Drive Unit
and motor.
Poor connection of
bus signal between
Drive Units. (CN5)
No "Servo enable
signal.
Spindle Motor
winding is
disconnected.
The feed axis is
overloaded.
Spindle Motor is fault.
(Rotor and stator
contact each other by
fault of bearing.)
Spindle Motor rotates The power line from
slowly or it is
Inverter is
prevented from disconnected or
rotating by vibration.
connected incorrectly.
The encoder wiring is
disconnected, connect
incorrectly or the
encoder connector is
pulled out.
Motor encoder is fault. Turn the motor by hand
Table 3.1 Errors without alarm display
Cause Check point
Check the voltage between
the main power supply
terminals.
Check the voltage between
the control power supply
terminals.
Check the voltage between
the main circuit power
supply terminals.
Check the looseness of
connector.
Check the wiring.
Check the looseness of
connector.
Check the wiring.
"
Check signal
"DB3x.DBX93.7
status screen (see 5.2).
Measure the resistance
between Spindle Motor
terminals.
Try the no-load running.
Separate Spindle Motor
from load and check
whether the shaft can be
rotated by hand.
Check wiring between
Inverter and motor.
Check the wiring of
encoder signals.
and check whether unusual
speed is displayed on
speed meter.
3-4
Remedy
Turn on the main power
supply.
Turn on the control
power supply.
Turn on the main circuit
power supply.
Insert and fix the
connector securely.
Correct the wiring or
replace the cable.
Insert and fix the
connector securely.
Replace the cable.
Contact maintenance
" stuff or machine tool
on PLC
builder to check the
sequence of PLC.
Replace Spindle Motor.
Reduce the load or
consider replacement of
new machine with larger
capacity.
Replace Spindle Motor.
Correct the wiring.
Correct the wiring.
Replace motor or
encoder.