Yaskawa G7 Drive - Manual (Page 20)

Date: 03/31/09, Rev: 09-03 Page 20 of 30 TM.G7SW.064
4.7 Faults (continued)
Fault Display Description Causes Countermeasures
FDEV
Follower Pos
Dev
The position error has
exceeded the Follower
Deviation Level (P2-06)
and the Follower Deviation
Selection (P2-07) is set to
2 (Coast to Stop).
ƒ Mechanical binding of
the follower motor.
ƒ The Follower Deviation
Level (P2-06) is too low.
ƒ The master encoder is
rotating, the follower is
stopped, and the
Position Error
Accumulation Selection
(P1-09) is set to 1 (error
is always accumulated).
ƒ The master input
frequency is greater than
the follower maximum
frequency (E1-04).
ƒ Confirm the machinery
is operating correctly
and the follower motor
is not binding.
ƒ Increase P2-06.
ƒ If the application
requires that the master
encoder rotate while the
follower is stopped, set
P1-09 = 0 (position
error only during run).
ƒ Set E1-04 to 10% faster
than the maximum
master input frequency.
PL
Loss of Position
The follower drive has lost
its position information.
This has occurred because
one of the following
conditions exist:
ƒ The position error has
exceeded 268,435,456
counts.
ƒ The pulse frequency
after the gear ratio is
so high that the
follower cannot run at
this speed without
exceeding the encoder
option card hardware
limitation (300kHz).
ƒ Mechanical binding of
the follower motor.
ƒ The master encoder is
rotating, the follower
drive is stopped, and the
Position Error
Accumulation Selection
(P1-09) is set to 1
(position error is always
accumulated).
ƒ The desired follower
speed is too high for the
PPR of the installed
encoder.
ƒ Confirm the machinery
is operating correctly
and the follower motor
is not binding.
ƒ If the application
requires that the master
encoder rotate while the
follower is stopped, set
P1-09 = 0 (position
error only during run).
ƒ Replace the follower
motor’s encoder with a
lower PPR model.
4.8 Alarms
Alarm Display Description Cause Countermeasures
FDEV
Follower Pos
Dev
The position error has
exceeded the Follower
Deviation Level (P2-06)
and the Follower Deviation
Selection (P2-07) is set to
1 (Alarm Only).
ƒ Mechanical binding of
the follower motor.
ƒ The Follower Deviation
Level (P2-06) is too low.
ƒ The master encoder is
rotating, the follower
drive is stopped, and the
Position Error
Accumulation Selection
(P1-09) is set to 1 (error
is always accumulated).
ƒ The master input
frequency is greater than
the follower maximum
frequency (E1-04).
ƒ Confirm the machinery
is operating correctly
and the follower motor
is not binding.
ƒ Increase P2-06.
ƒ If the application
requires that the master
encode rotate while the
follower is stopped, set
P1-09 = 0 (position
error only during run).
ƒ Set E1-04 to 10% faster
than the maximum
master input frequency.