Monitoring relay FRSS1-38

• This unit monitors the speed of rotating equipment using a magnetic pick-up and provides three relay outputs according to measured
speeds. The pick-up could, for instance, detect teeth on a rotating gear
or fl ywheel. The unit also provides a tachometer output for speed indication. The relay outputs can be used for alarm or control purposes.
LEDs indicate power on and relay status.
• Controls on the front panel set the trip points at which the relays and
LEDs operate:
• Crank speed – set just above the speed of the crank motor.
• Under speed – set below the normal running speed (<100%)
• Over speed – set to the maximum permitted speed (>100%).
• The unit can be calibrated such that a standard 100% on the unit represents the required nominal engine speed.
• These instructions contain important safety information. Please read
them thoroughly before commissioning, operating or maintenance of
the unit.