Unitronics UMI-B1 UL Series Operation Manual page 44

UMI-B1 UL Series Inverter
Function
Name
code
4 for the
iron core of
AM1
Motor
overload
P02.26
protection
selection
Motor
overload
P02.27
protection
coefficient
P02.28 Correction Correct the power displaying of motor 1.
Detailed instruction of parameters
0: No protection
1: Common motor (with low speed
compensation). Because the heat-releasing
effect of the common motors will be
weakened, the corresponding electric heat
protection will be adjusted properly. The low
speed compensation characteristic
mentioned here means reducing the
threshold of the overload protection of the
motor whose running frequency is below
30Hz.
2: Frequency conversion motor (without low
speed compensation). Because the
heat-releasing of the specific motors won't be
impacted by the rotation speed, it is not
necessary to adjust the protection value
during low-speed running.
Times of motor overload M = Iout/(In x K)
In is the rated current of the motor, Iout is the
output current of the inverter and K is the
motor protection coefficient.
So, the bigger the value of K is, the smaller
the value of M is. When M =116%, the fault
will be reported after 1 hour, when M =200%,
the fault will be reported after 1 minute, when
M>=400%, the fault will be reported instantly.
Time
1 hour
1 minute
116%
Setting range: 20.0%–120.0%
Times of motor overload
200%
42
Function parameters
Default
Modify
value
◎
2
○
100.0%
○
1.00