EATON XV-303-15-C00-A00-1B Contactor Base Moduleor Relay Base Unit

antibackspin Timing

For certain applications, such as pumping a fluid up a pipe, the motor

may be driven backward for a period of time after it stops.  The MP

3000 provides an antibackspin timer (minimum time between stop and

restart) to prevent starting the motor while it is spinning in the reverse

direction.  The relay displays the timer countdown from the moment a

stop is declared by the relay.

2.2.4 Load Shedding

The MP-3000 provides a mechanical load shedding feature that can be

used to control the driven process.  The load shedding function closes

a contact on an overload condition to stop addition of load until the

overload condition subsides by a set amount.  Then the load shedding

contact opens and the load is restored.

2.2.5 Emergency Override

The MP-3000 has a User-programmable feature that lets the operator

reset certain trip conditions, including the jogging timers and thermal

model overload bucket.  This function is for use in emergency condi

tions only and may result in motor damage or failure.  The override

action is logged with time-tag.  The pushbutton is located behind a

security door.  The function can be disabled.

2.2.6 Long acceleration Motors

Large motors with high inertia loads, such as centrifuges and large

fans, may experience starting currents that greatly exceed the full load

current for greater than the locked-rotor time.  The MP-3000 has a tim

ing feature that holds off thermal tripping during the long acceleration.

This should be used this with a zero-speed switch input.

2.2.7 Motor Starting Profile

The MP-3000 records the average current and voltage versus time for

the last four starting cycles.  This information is available via the com

munications port.  The PowerNet host plots the motor current versus

the motor cold-start protection curve, as shown in Figure 2.1.

The MP-3000 Motor Protection Relay has a User-friendly interface

that makes it easy to retrieve important information or to make set

ting changes.  LEDs provide visual indication of display mode.  The

pushbutton access scheme is easy to learn, and quickly accesses the

large volumes of setting, monitoring, logging, and historical

information.

The User may also access settings via the front panel RS-232 port.

The JTAG port is for factory use only