EM-GS User's Manual
6. Protection Functions and Directions
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6. Protection Functions and Directions
We make our soft starters have all kinds of protection functions to protect the safety of soft starter and the motor.
Please choose the correct protection Class and parameters according to your application conditions!
Over-heat protection: When soft starter inside temperature is up to 80
o
C ± 5
o
C, the starter will turn to over-heat
protection, when be down to 55
o
C, this protection removes.
Input less-phase protection: The delayed time < 3s
Output less-phase protection: The delayed time < 3s
Three-phase unbalance protection: The delayed time < 3s, when the difference of current among three phrases is
more than 50% ± 10%, the protection be valid.
Starting over-current protection time: The diagram of over current 5 times of
F6
set rated working current is just
as diagram 6.1.
Working over-load protection time: The starter will be in inverse time thermal protection on. Base of the Max
working current of motor (Set by
F6
), (The diagram 6.1 show)
Low voltage protection delay time: When power voltage is less than 40%, the protection delayed time < 0.5s;
When power voltage is less than 80%, the protection delayed time < 3S.
Over-voltage protection delay time: When power voltage is more than 140%, the protection delayed time < 0.5S;
When power voltage is more than 120%, the protection delayed time < 3S.
Loads short-circuit protection delay time: The protection delayed time < 0.1S.
Motor less load protection delay time: The protection range (10% ~ 90%) is set by
FU
; the delayed time is 5~90
seconds. When
FU
< 10, the protection is invalid.
6.1 Protection classes and explanation
According different usage conditions, EM-GS series Soft Starter has five protection classes, as following:
0. Primary protection
1. Light-load protection
2. Standard protection
3. Heavy-load protection
4. The superior protection
Primary protection includes the protection functions of overheat, short circuit, and input default phase protection
and prohibit external instantaneous stop terminal. Which is proper urgently startup conditions, such as fire pump.
The protections of light load, standard and heavy-load have the overall protection function of soft starter. The
difference among them is protection level of overload and over current. See the diagram of 6.1.
Under the superior protection, the soft starter has a higher protection level.
The protection classes and the time of heat protection as (diagram 6.1)
