Hitachi S1 Series Basic Manual page 109

S1 series standard inverter
Function
Name
code
coefficient 4 of
iron core of
asynchronous
motor 1
Overload
P02.26 protection of
motor 1
Overload
protection
P02.27
coefficient of
motor 1
Power display
calibration
P02.28
coefficient of
motor 1
Detailed parameter description
0: No protection
1: Common motor
compensation). As the cooling effect of common
motor will be degraded in low speed, the
corresponding electronic thermal protection value
should also be adjusted properly, the low
compensation here means to lower the overload
protection threshold of the motor whose running
frequency is below 30Hz.
2: Frequency-variable motor (without low speed
compensation). As
frequency-variable motor is not affected by the
rotating speed, there is no need to adjust the
protection value during low speed running.
Motor overload multiples M=Iout/(In×K)
In is rated motor current, lout is inverter output
current, K is motor overload protection coefficient.
The smaller the K, the larger the value of M, and
the easier the protection.
M=116%: protection will be applied when motor
overloads for 1h; M=200%: protection will be
applied when motor overloads for 60s; M>=400%:
protection will be applied immediately.
Time t
1h
1m
116 %
Setting range: 20.0%–120.0%
This function adjusts the power display value of
motor 1 only, and it does not affect the control
performance of the inverter.
Setting range: 0.00–3.00
-104-
(with low-speed
the cooling effect
Motor overload multiple
200 %
Default
Modify
value
◎
2
of
○
100.0%
○
1.00