PROTECTIVE FUNCTIONS
136
5.2.3 Speed greatly differs from the setting
Check that the fre
uenc
settin
si
nal is correct.
Measure the in
ut si
nal
level.)
Check that the followin
arameter settin
s are correct
Pr. 1, Pr. 2, Pr. 19,
Pr. 245).
Check that the in
ut si
nal lines are not affected b
external noise.
Use shielded
cables)
Check that the load is not too heav
.
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
is not too lar
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
.
In a
itators, etc., load ma
become heavier
in winter.)
Check that the torque boost settin
is not too lar
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
com
ensation is selected, the out
ut fre
uenc
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
of the applied motor capacit
Pr. 80
is correct for the
inverter capacities in general-purpose magnetic flux vector control.
Check that the wirin
len
th is within 30m in
eneral-purpose ma
netic flux
vector control.
Check that the wiring length is correct in V/F control.
5
