Woodward MRM4, Manual

Page: 355 / 460

Protective Elements
MLS - Mechanical Load Shedding
Available elements:
MLS
Functional Description
In some applications, the protective device can forestall a JAM alarm or trip, or a thermal trip, by sending a
signal to the process to reduce loading. The load-shedding function, if enabled, closes or opens a relay contact
to shed process load when the motor load current goes above the Load-shed threshold, for a time exceeding the
» t-Pickup Delay« . This could, for example, be connected to stop flow of material into the driven process until the
load current falls below the threshold, for the time determined by the » t-Drop Delay« .
Set the load-shed drop current comfortably below the JAM trip level. It may be useful to set it below the Ultimate
Trip Current, particularly if Remote Temperature Detection is not used.
The load shed function, is active only during the »RUN« state of the motor.
EN MRM4 01/11 Page 355