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.