Service manual

www.enc.net.cn/en Tel/Fax:[phone] Detailed function description
106
F9.03
Motor overload protection
mode selection
Range：LED1
st
：0, 1
LED2
nd
：0, 1
01
LED1
st
：motor overload protection selection
This parameter defines protecting action mode when overload, overheat take
place in the inverter.
0: no action. No motor overload protection characteristic(apply with
caution)，here the inverter have no overload protection for load motor；
1: inverter cut off output at once. The inverter cut off output and motor
stop freely when overload, overheat take place.
LED2
nd
：Motor phase loss protection selection。
0: Motor phase loss protection enable. This protection begins detection when
the inverter output frequency over 3.00 Hz
1: Close the output phase loss protection. When the motor phase is lossing,
the inverter does not directly conduct phase protection, but other inverter over
current protections are still valid. This operation may lead to serious motor heat
when the motor occurs phase loss, and may result in fire, non-specific applications,
please do not turn off this protection.
F9.04
Motor overload protection
coefficient
Range: 20.0－120.0(%)
100.0(%)
This parameter sets sensibility of the inverter implementing thermal relay
protection to load motor, can implement correct heat protection to the motor by
setting this value when output current value of load motor don’t match rated
current of the inverter, as shown in Fig.6-38.
Value of this parameter can be determined by following formula:
[F9.04]= ×100
motor rated current
inverter rated output current
(1) To use failure self-restoration function must take device allowance and no essential
failure in the inverter as preconditions.
(2) Self-restoration function is ineffective to failure protection caused by overload and
over heat.
(3) When F9.00 is not 0, the restart function works without personnel operation, so this
feature needs to be used with caution.
(4) Regardless of forward or reverse before power failure, it will be forward after restart.
!
The inverter will lose thermal relay protecti on function when a piece of inverter drive
multi ple motors in parallel. Please assemble heat protection relay at input side of each
motor to protect them effectively.
note