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info@mcm-fieldcore.com SIL-3 Overspeed Protection System
SIL-3 Overspeed Protection System
⦿ Voted arrangements – 2 out of 3 as standard
⦿ On line test trip and signal injection facilities
⦿ Key lock inhibit
⦿ High visibility displays and lamps
⦿ Approval to IEC 61508 SIL-3
⦿ Dual redundant power supply option.
⦿ Response time <20ms
Overspeed Mode
The Overspeed mode when set shall capture maximum
machine speed event following a shutdown. This
positive going alarm can be allocated to an appropriate
relay.
Overspeed Mode Auto / Manual
Overspeed Trigger 0 – 50,000rpm
Zerospeed Alarm
The zerospeed alarm is raised when the shaft rotation
drops below a set speed. This negative going alarm can
be allocated to an appropriate relay.
Zerospeed detection period 1 – 60 seconds
Over Acceleration Alarm
The acceleration alarm is raised if the rate of change of
speed exceeds the set percentage. This positive going
alarm can be allocated to an appropriate relay.
Acceleration Setting 1 – 1000%
Acceleration Start 100 – 50000 rpm
