Woodward MRM4, Manual, Page: 343 / 460

Protective Elements
Underload and JAM Trip Function
These would be represented by two such vertical lines, both below the normal load current. Be sure to set the
alarm level
above the trip level. Each element has its own delay timer. Use the start delay to block tripping until
the load stabilizes after a start. Use run delays to avoid nuisance alarms or trips for load transients.
EN MRM4 01/11 Page 343
Underload Pickup based on
a multiplier of Ib
JAM based on a multipler of Ib
JAM based on a multipler of Ib
Underload Pickup based on a multiplier of Ib
t [
s]
multiples of Ib
Underload delay time
JAM Delay Time
Underload Trip function, not active
during start delay function.
JAM function, not active
during start delay
function.