User Manual
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7.2- Overload protection
Protector can track thermal capacity of the motor to avoid motor from overheating or damage.
Controllers to simulate the thermal capacity of the motor in a variety of operating conditions, can
real-time monitoring of motor heating conditions. Ensure effective protection of the repeated
starting of the motor overheating condition continuous run.
Device provide 12 inverse time protection curves; user can select suitable curve for different
motor working condition.
Typical trip time in different K factor and protection class
K factor
Class
I/Ie
1.0
1.2
1.5
7.2
125
10
Tripping time
Without trip
in 2h
trip in 1h
≤2min
2s<Tp≤10s
250, 300
10
≤4min
4s<Tp≤10s
500
20
≤8min
6s<Tp≤20s
750
30
≤12min
9s<Tp≤30s
Inverse-time formula:
𝐭 =
𝐊
(
𝐈
𝐈𝐞)
𝟐
− 𝟏
t -- Operating inverse time
I-- Actual motor working current value
Ie -- Motor rated current
K – Preset K factor curve need set
t s
X In
