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Protective Functions
Alarm
Protection
Code No.
* Encoder A/
No encoder A- and B-phase pulse is de-
2 0
tected. The encoder failed.
B-phase
error
2 1
Due to no communication between the
* Encoder
communication
encoder and amplifier, the detective func-
error
tion for broken encoder wires is activated.
2 2
* Encoder
The connection between the encoder and
amplifier is broken.
connection
error
2 3
* Encoder
The encoder sends an erroneous data
communication
mainly due to noises. The encoder is con-
data error
nected correctly, though the data is not
correct.
2 4
P o s i t i o n
The position error pulse is larger than
error
Pr63 (position error limit).
1) Operation of the motor does not follow the
commands.
2) Pr63 value (Position error limit) is smaller.
]
Over-speed
The motor velocity exceeds the specified limit.
2 6
error
Command
The scale ratios set by Pr46 through Pr4B (nu-
2 7
pulse sealer
merator of 1st to 4th command scale) are not
error
correct.
C a u s e
- 64 -
C o u n t e r m e a s u r e s
Correct the encoder wiring per the wiring
diagram. Correct the connection of the
pins.
Make sure that the power of the encoder
is 5VDC ±5% (4.75 to 5.25V). Especially when
the wire length is long, it is important to meet
this requirement. You should not bundle the en-
coder wires and motor wires together. Connect
the shield to FG. See the encoder wiring dia-
gram.
1) Check whether the motor operates per
the position command pulse or not. See
the torque monitor to check if the output
torque is saturated. Readjust the gains.
Maximize the value of Pr5E (torque limit
set-up). Correct the encoder wiring per
the wiring diagram. Increase the accel-
eration and deceleration time. Reduce
the load and velocity.
2) Increase the value of Pr63.
Do not give excessive speed commands. Check
the frequency of the command pulse and scale
ratio. If an overshoot occurs due to wrong gain
adjustment, readjust the gains. Correct the en-
coder wiring per the wiring diagram.
Check the set values of Pr46 through 4B.
Adjust the scale ratio so that the fre-
quency of the command pulse may be
500 kpps or less.
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