GE Multilin™ M60 Motor protection system Breaker Failure Protection

Start Inhibit

The start inhibit function prevents the starting of a motor when the motor is too

hot and does not have a sufficient amount of thermal capacity available to allow a

start without being tripped offline.

Breaker Failure Protection

The breaker failure protection element monitors for timely operation of the

connected breaker. If a trip command is not successful in operating the breaker

and clearing the fault, the breaker failure element can be used to send trip signals to

upstream breakers to clear the fault.

Undercurrent Protection

The undercurrent protection element provides the ability to trip the motor due

to external conditions that can cause the load being pulled by the motor to drop

below a preset level.  This element is useful when the loss of the load results in a loss

of cooling which will cause the asset to overheat.

Under/Over Frequency Protection

The under/over frequency protection element detects when the motor is

operating at off-nominal frequencies (which can damage the process) or signals

to upstream protection or control to implement load-shedding actions.

RTD Protection (Module Option 5C)

The M60 RTD option provides 8 programmable RTD inputs per module that

are used for monitoring the stator, bearing and ambient temperatures. Each RTD input

has 2 operational levels: alarm and trip. The M60 supports RTD trip voting and provides

open RTD failure alarming. Alternatively, a remote RTD module “RRTD”, which

supports 12 RTD inputs, can also be used with the M60 for temperature monitoring.

The RRTD provides cost savings compared with standard RTD wiring.