NIetz Electric Co.,Ltd
Soft starter SSN/SSA serie User Manual
23
A58888
Current Limit Time
The range of Limit Time is 1~120 second at the Current Limit mode. The default
is 30。
In the Current Limit Mode, if the actual starting time is longer than this value,
and the starting current is not less than the 125% of the motor rate current, system
enter the Protection State。
A68888
Over Current protect at starting and stopping
The range of this parameter is 400~600%Ie. This parameter is set for the protect
function aimed at the big current at the starting process. The default value is
400.
This parameter should be increased when the inertial of the load is bigger。
A78888
Current unbalance factor
This parameter is set for the protect function aimed at that the difference of
3 phases current is bigger at running. The default value is 30%.The smaller this
parameter is, the more the sensitivity is. This parameter should not is too small,
in order to avoid the protection is too sensitive to influence the normal operation
of the equipment.
Note: This protect function is active only when the average current is bigger than
the 20% of the rate current
The calculation of the current unbalance factor
current unbalance factor △I％ = （Imax-Imin）/Iaver
Iaver＝（Ia＋Ib＋Ic）/3
A88888
Control Mode
Modifying this parameter, user can change between the keyboard and terminal
easily. The default is 1. It means the keyboard control. If it is set 2, it means
the terminal control. If it is set 3, it means the terminal control and keyboard
control are all available
Note: If it is set 3(the terminal control and keyboard control are all available),
the keyboard is invalid ,if two-line way is used. User can set this parameter by
keyboard referring to chapter 8-1 and chapter 9.5.
A98888
SCR trigger select
The operation mode of SCR is decided by it after the bypass contactor is on.
1—when the bypass is on, SCR trigger is blocked. The running current shows on the
keyboard, and the protection functions are all on.
2-- when the bypass is on, SCR trigger is not blocked. The running current shows
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