The function can be enabled and disabled with the Operation setting. The corresponding parameter values are "On" and "Off".
The operation of TCSSCBR can be described by using a module diagram. All the modules in the diagram are explained in the next sections.
TCS status
This module receives the trip circuit status from the hardware. A detected failure in the trip circuit activates the timer.
Timer
Once activated, the timer runs until the set value of Operate delay time has elapsed. The time characteristic is according to DT. When the operation timer has reached the maximum time value, the ALARM output is activated.
The BLOCK input can be controlled with a binary input, a horizontal communication input or an internal signal of the relay program. The activation of the BLOCK input prevents the ALARM output to be activated.