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PROTECTIVE FUNCTIONS
136
5.2.3 Speed greatly differs from the setting
Check that the fre
q
uenc
y
settin
g
si
g
nal is correct.
(
Measure the in
p
ut si
g
nal
level.)
Check that the followin
g
p
arameter settin
g
s are correct
(
Pr. 1, Pr. 2, Pr. 19,
Pr. 245).
Check that the in
p
ut si
g
nal lines are not affected b
y
external noise.
(
Use shielded
cables)
Check that the load is not too heav
y
.
5.2.4 Acceleration/deceleration is not smooth
Check that the acceleration and deceleration time settings are not too short.
Check that the load is not too heavy.
Check that the torque boost settin
g
is not too lar
g
e to activate the stall prevention
function.
5.2.5 Motor current is large
Check that the load is not too heavy.
Check that the torque boost setting is not too large.
5.2.6 Speed does not increase
Check that the maximum frequency setting is correct.
Check that the load is not too heav
y
.
(
In a
g
itators, etc., load ma
y
become heavier
in winter.)
Check that the torque boost settin
g
is not too lar
g
e to activate the stall prevention
function.
Check that the brake resistor is not connected to terminals P-P1 accidentally.
5.2.7 Speed varies during operation
When sli
p
com
p
ensation is selected, the out
p
ut fre
q
uenc
y
varies with load
fluctuation between 0 and 2Hz. This is a normal operation and is not a fault.
1) Inspection of load
Check that the load is not varying.
2) Inspection of input signal
Check that the frequency setting signal is not varying.
Check that the frequency setting signal is not affected by noise.
3) Others
Check that the settin
g
of the applied motor capacit
y
(
Pr. 80
)
is correct for the
inverter capacities in general-purpose magnetic flux vector control.
Check that the wirin
g
len
g
th is within 30m in
g
eneral-purpose ma
g
netic flux
vector control.
Check that the wiring length is correct in V/F control.
5