Yaskawa E7 Drive Technical Manual - Manual (Page 19)

Date: 02/25/2010, Rev: 10-02 Page 19 of 34 TM.F7SW.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.
AF
Alignment Fault
ƒ Too much distance
(follower motor
revolutions) was
counted between the
two trigger inputs
during an alignment
routine.
ƒ The distance
measured between the
two trigger pulses
(during alignment) has
exceeded 268,435,456
encoder counts.
(Regardless of the
P4-07 setting).
ƒ The distance between
the master and the
follower exceeded the
allowable amount
(P4-07).
ƒ Malfunctioning or mis-
wired trigger switches.
ƒ Check the machine
integrity.
ƒ Check the trigger
switches for proper
wiring and operation.