Forced Start Function
Description
Forced start function allows user to force the motor to start when the motor is in inhibit status due to thermal inhibit, thermal trip or maximum number of starts inhibit.
 WARNING |
|---|
|
LOSS OF MOTOR PROTECTION
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
|
To configure forced start function:
-
Enable forced start function, refer to Motor Starter Settings.
-
Configure one digital input for forced start, refer to Input Assignment .
-
Configure thermal overload protection with reset mode as Auto, refer to Thermal Overload.
Operating Principle
If the motor is stopped due to thermal trip or maximum number of starts reached, it is possible to force the motor to start by using the forced start digital input and one Start command from any source.
On detection of forced start digital input, TeSys Tera system waits for the start command from any source for 5 s.
On detection of forced start with start command from any of the source, TeSys Tera system bypasses the thermal inhibit, the thermal trip inhibit, Direction inhibit and maximum starts inhibit and activates the contactor output. During motor starting, TeSys Tera system forces or blocks the thermal memory to 90% or the block level if block function is enabled in thermal overload protection function till a time corresponding to the trip class setting is elapsed (time is 5 s for class 5 setting, 40 s for class 40 setting).
TeSys Tera system will stop the motor if any of the following motor stop cause is detected:
-
Stop command from valid source as per the selected Operating Mode.
-
Stop command from a digital input assigned to Forced stop (optional), refer to Input Assignment .
-
Stop command from Auto restart function.
-
Trip detected.