6. Protection Functions and Explanations
We make our soft starters have all kinds of protection functions to protect
the soft starter and the motor using. Please choose the correct protection
class and parameters according to your application conditions!
Over-heat protection: when the temperature inside soft starter is up to
80
℃
±5
℃
,the starter will be into over-heat protection, when it down to
55
℃
,this protection invalid.
○
Input failure-phrase protection: the delayed time
＜
3s
○
Output failure-phrase protection: the delayed time
＜
3s
○
Three-phrase unbalanced protection: the delayed time
＜
3s,when the
different current value among three phrases is more than 50%±10%,the
protection be used.
○
Starting over-current protection: the diagram 6.1 shows the protection
time when the current is 5
times than the rated working current.
○
Working over-load protection: the starter will be in inverse time thermal
protection on
more
Base of the Max working current of motor (Set by F6 Item),
(The diagram 6.1 s how)
○
Power voltage failure protection: the delayed time is separately less
than 0.5s or 3s when the power voltage is less than half of limited value
or less than setted value.
○
Over-voltage protection: the delayed time is separately less than 0.5s
or 3s when the power voltage is more than 130% of limited value or more
than the setted value.
○
Loading short-current protection: when the current is 10 times
than the motor rated current, it will be short circuited, and the short-
current protection will be take effect, the time is less than 0.1s.
○
The time parameters above start from the time receiving the message till
the protection take effect. The parameters are for reference only, all the protection
function can be proved by the applicaiton or the
simulated test,
If it is not meet
your demand, the special protection is needed to guarantee the safety.
6.2 Protection Classes and Explanations.
According different usage conditions, FWI-SS3 Soft Starter has five
protection classes, as following:
a. Primary Protection Level
b. Light-load Protection Level
c. Standard Protection Level
d. Heavy-load Protection Level
e. The Super Protection Level
●
Primary protection level includes the protection functions of over-heat,
short -current protection and input failure-phrase protection when starting,
but no protection of internal connector instantaneous-shop. we can set the
protection level when the motor don’t need to be stopped urgently, such
as fire pump.
more
VTdrive
VTdrive
www.vtdrive.com
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