Basler Electric BE1-25 BE1-25/79TR CONTROL SYNC-CHECK RECLOSING RELAY

The Electronic Manual Voltage Control MVC-300 is a solid-state

device en closed by a wrap-around metal chassis.

The MVC-300 is for mounting through a panel with controls

accessible from the front of the panel or can be mounted behind

the panel. A terminal strip located on the rear of the device

facilitates installation. A manual voltage adjust potentiometer and

a manual-off-auto switch are provided on the front face of the unit.

For use of a user-supplied external manual adjust potentiometer or

for adjust by a motor operated control (MOC), order MVC-301.

The MVC-300 and MVC-301 are designed to operate with Basler

voltage regulators powered from 120 or 240 volt AC sources up to

320 Hz. The adjustable output of the MVC-300 supplies power to 32.

63 or 125 volt fields at 7 amps.

BE3-47N phase balance relays protect three-phase lines,

transformers, motors, and generators against phase

unbalance, phase loss, and phase reversal. BE3-47N/27

relays have the added feature of undervoltage protection.

The output relay energizes and the red RELAY LED lights

when a balanced input with the proper phase sequence is

sensed. The output relay de-energizes and the RELAY LED

goes out when a fault condition is detected. The green

POWER LED indicates the condition of the power supply.

Two external controls are provided: UNBAL (unbalance) and

DELAY. The UNBAL control adjusts the percentage of

unbalanced voltage at which the relay trips. The DELAY

control provides an adjustable time delay to prevent tripping

on voltage transients.

The BE3-47N and BE3-47N/27 phase balance relays have

two external, user-adjustable controls marked UNBAL and

DELAY. The UNBAL control adjusts the relay trip point. The

relay trips when the voltage becomes unbalanced by the

percentage set by the UNBAL control. The trip point is

adjustable from 5 to 15% (±5%) of nominal input. The

DELAY control adjusts the time from when a fault is

detected until the output contacts change state. The delay is

adjustable from 0 to 10 seconds. The undervoltage feature

of the BE3-47N/27 has no external adjustment and is fixed

at 85% of the nominal input voltage. If all three phases

remain balanced, but decrease below 85% of nominal

voltage, the relay de-energizes.

The Basler Microprocessor-Based Reference Adjuster, Model RA-70.

replaces Motor Operated Potentiometers and provides a totally solid

-state method of adjusting the setpoint on Basler Automatic Voltage

Regulators (AVRs), Basler Shunt Static Exciter-Regulators (SSEs),

Basler Manual Voltage Controls (MVCs), the Basler Var/Power Factor

Controller (SCP-250) and other input devices having a rheostat or

potentiometer type control adjustment. The unit is designed for

"behind-the-panel" mounting in switchgear or control boxes.

All controls, inputs, outputs, and LED indicators are located on the

unit's front panel for ease of installation and adjustment.

The RA-70 Reference Adjuster also comes equipped with a 0-1 mA

output signal to operate a position indicator that will indicate the

setpoint position.

A terminal voltage limiter within the IFM-150 can be enabled to

monitor the generator voltage through the  synchronizing

transformer or external voltage transducer and compare the

measurement with a user adjustable reference level.

If the generator voltage exceeds the reference level for a user

-adjustable amount of time, the IFM-150 will modify the SCR

firing pulses and limit the generator voltage.

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