7.3
Motor malfunction and insulation
7.3.1 Motor not starting
Motor couldn't be
started
Whether charging
indicator is on and
the panel LED
displays
Whether the power
-side circuit breaker
is connected with
magnetic contactor
Connected
Eliminate the alarm
reason, re-operate
after alarm reset
Whether LED
displays alarm
information
Whether the voltage
at the power input
terminals R, S, T
is normal
Check whether there
is low-voltage,
phase-lack,
unwell-connection
or other malfunction.
Eliminate the
malfunction
Whether is on the
setting state
Return to stand-
by state
Continually operate
if no malfunction
Input order by
keyboard panel or
by controlling
terminals
Whether there is
short-circuit chip or
DC reactor between
the P-P+ terminals
Connect short-
circuit chip or
DC reactor
Maybe because of
mal-function or
mal-operating.
Please contact
our company
Control terminal STF,
STR and COM
closed, whether
start operating
Whether has ordered
positive-rotating or
reversing
Whether the exterior
circuit wring
connection between
the STF,STR and
COM terminals
Replace ill switch
or ill relay
Press
to set up
frequency
Whether has set up
frequency
Whether the wiring
of X1-X3 and COM
is right when select
multi-step frequency
Rectify
connection
Press
under the
stand-by mode to see
whether the motor
has been started
Whether the upper-limit
frequency and the setting-up
frequency are lower than
starting frequency
Rectify setting-up
frequency
Motor malfunction
Whether there is
output voltage on the
Inverter output
terminals UVW
Maybe the
Inverter
malfunction,
please contact
our company
Whether the on-
load is too big
Whether the motor
connection is right
Rectify
connection
Whether has torque
lifting performance
Over-load and motor be locked, should
decrease load. If there is band-type brake,
check whether it has been loosen
Choose torque lifting
performance
Whether work normally
Eliminate
malfunction
Yes
No
No
Yes
Yes
Yes
No
No
Yes
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
No
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
7.3.2 Motor could operate but couldn't change speed
Motor could
operate but
couldn't change
speed
Whether the
max frequency
has been set up
too low
Change the
setting value
Change the
setting value
Whether is the
frequency upper
and low limit
operating
Whether the
time has been
set too long
Whether the
procedure
operation has
been finished
Whether procedure
operated. Which
method of frequency
setting when
procedure: operate
panel, analog signal,
exterior up-down
operate
Set up
frequency
Press
button
under the stand-
by mode to see
whether the
speed changed
Whether the
frequency setting
value (0-10V,
4-20mA) changed
Whether all the
speed of
procedure
steps are set
same
Whether the
exterior circuit
wiring of
up-down control
circuit and X1,
X2, COM
terminals is right
Rectify
connection
Whether the control
terminals is
connected right
with exterior
circuit wiring
Whether all step
frequency chose
by multiple-zone
are all different
Change the
setting
frequency
Maybe because
of mal-function
or mal-operating.
Please contact
our company
Whether the
accelerate/
decelerate time
are set up normally
Set up suitable
accelerate/
decelerate time
according to load
inertia
Yes
No
Yes
Yes
No
Yes
Yes
No
Yes
No
No
No
Yes
Yes
No
No
No
Yes
No
No
7.3.3 Motor heat abnormally
Motor heat
abnormally
Whether the torque
lifting and the setting
V/F characteristic is
suitable
Regulate the torque
lifting and the setting
V/F characteristic
Whether operate at
low speed continually
Should use motor
special for
Inverter
Whether the on-load
is too heavy
Decrease load or
increase Inverter
capacity
Maybe because
of mal-function
or mal-operating.
Please contact
our company
Whether the three
phase of Inverter
output voltage balance
with each other well
Motor malfunction
Yes
No
Yes
Yes
No
No
Yes
No
Article7 Fault Diagnosis and Treatment
Article7 Fault Diagnosis and Treatment
No
Operate
panel
Simulation
signal
Lift or
down control
Program
run
Operate
panel
Control
terminal
