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Problem
Motor
rotates in the
wrong direction
Motor speed is too
high or
low
with
re-
gard
to
the
set fre-
quency
Motor
acceleration
or
deceleration is er-
ratic.
Motor speed is unsta-
ble
Motor current is too
large
Motor
speed
is
not
accelerated.
Checkups
*
Is output phase sequence (U, V, W) correct?
'
Are 'FWD' and 'REV' signal lines connected to correct terminals?
'
Is the frequency reference signal correct? (Measure the input signal
level.)
Are values set for the following parameter correct?
Maximum frequency (Pr.l), frequency at 5 V input (Pr. 20), frequency at
20 mA input (Pr.
39),
biaslgain (C-2 to C-5)
*
Are input signal lines affected by external noise? (If so, use shielded
wires.)
*
I s
time for acceleration or deceleration too short?
'
I s
load too heavy?
'
Is stall protection activated from excessively large value set for torque
boost?
-
Is load changing?
*
Is the frequency reference signal stable?
'
Is
load too heavy?
*
is torque (manual) setting value too large?
I s
the maximum frequency setting value correct?
I s
it too small?
'
Is load too heavy?
Is stall protection activated from excessively large value set for torque
boost?
Note: Parameter is abbreviated as Pr.
-112-
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