Basler Electric BE3-27T User Manual

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INTRODUCTION

BE3 ac voltage relays provide voltage monitoring and protection in
both single-phase and three-phase systems. They are used in
applications such as utility mains failure, regulation of power
supplies, and to protect voltage sensitive equipment. Undervoltage,
overvoltage, and combined over/undervoltage units are available.
BE3 ac voltage relays operate when the adjustable trip point is
reached. An external time delay control is provided with an
adjustment of 0 to 10 seconds (relay operating time is typically 200
milliseconds). This time delay may be used to prevent false tripping
when there are slight variations in the voltage supply. On
overvoltage units, the output relay energizes when the input signal
exceeds the trip point. On undervoltage units, the output relay de­energizes when the input signal goes below the trip point. A red
LED indicates the state of the relay. A green LED indicates the
condition of the power supply.

SPECIFICATIONS

Inputs

All units are self powered.
Nominal Voltage: 120 Vac, 240 Vac, 380 Vac, or 480

Overload Withstand: 1.25 times nominal continuously.

Frequency: 50, 60, or 400 Hz
Burden: <2.5 VA per phase on single units

Setpoint

Undervoltage Range: Adjustable 75 to 100% (±3%) of

Overvoltage Range: Adjustable 100 to 125% (±3%) of

Repeatability: Better than 0.5% of full span
Time Delay: Adjustable 0 to 10 seconds
Operating Time: 200 ms typical
Differential: Fixed 1% of nominal

Outputs

Relay Type: D.P.D.T.
AC Rating: 250 V, 5 A, non-resistive,

DC Rating: 125 V, 1 A, resistive, 120 W
Mechanical Life: 5 million operations

Temperature

Operating Temperature: 0°C (32°F) to 60°C (140°F)
Functional Temperature: –25°C (–13°F) to 70°C (158°F)
Storage Temperature: –40°C (–40°F) to 70°C (158°F)
Temperature Coefficient: 0.03% per °C (300 ppm/°C)

Humidity

Relative Humidity: 95% non-condensing

Physical

Mounting: DIN rail 1.38” by 0.29” (35 mm by 7.5

Case: Complies with IEC 529, DIN 40050,

Case Material: Complies with UL 94VO

Publication

9319500990

+1 618.654.2341 (USA)

Vac

2 times nominal for 3 s.

and <3 VA on combined units

nominal

nominal

1200 VA

mm)

BS 5490

Revision

E

Instructions

Model

BE3-27T, BE3-59T,

and BE3-27T/59T

Weight

Single Function: 0.88 lb (0.4 kg)
Multiple Function: 1.32 lb (0.6 kg)

Size

Single Function: 2.17” wide (55 mm)
Multiple Function: 3.93” wide (100 mm)

AGENCY

cULus listed to UL 508 and CSA C22.2 No. 14
CE compliant
GOST-R certified per the relevant standards of Gosstandart of

Russia

OPERATION

BE3-27T and BE3-59T ac voltage relays have two external, user­adjustable controls marked SET and DELAY. The BE3-27T/59T has
four controls: UNDER SET, OVER SET, UNDER DELAY, and
OVER DELAY. The SET control adjusts the relay trip point. An
overvoltage trip causes the relay output to energize when the
voltage rises above the SET threshold. The overvoltage SET level
is adjustable from 100 to 125% (±3%) of nominal input (V
undervoltage trip causes the relay output to de-energize when the
voltage decreases below the SET threshold. The undervoltage SET
level is adjustable from 75 to 100% (±3%) of nominal input. Time
delay is the amount of time that elapses after the trip point is
reached and when the output relay operates.

Setting Example: a BE3-59T relay with a nominal input rating of 240
Vac has the following settings:

• SET - 120%

• DELAY - 4 seconds

A trip occurs when the sensing voltage rises above 288 Vac and 4
seconds elapses. Reset occurs when the voltage decreases below

285.6 Vac (1% of nominal below setpoint).

INSTALLATION

BE3 ac voltage relays are designed for mounting on standard DIN
rails that comply to DIN-EN 50022. Mounting involves hooking the
top edge of the cutout on the base of the case over one edge of the
DIN rail. The opposite side of the cutout containing the release clip
is then pushed over the opposite side of the DIN rail. To remove or
reposition the relay, lever the release clip and move the relay as
required. BE3 relays should be installed in a dry, vibration-free
location where the ambient temperature does not exceed the
operating temperature range. Connections to the relay should be
made using wire that meets applicable codes and is properly sized
for the application. Figure 1 shows the terminal connections for the
BE3-27T, BE3-59T, and BE3-27T/59T relays.

CALIBRATION

The calibration marks on the faceplate have a maximum error of
10% and are provided only as guides. Proper calibration requires
using an accurate voltmeter in parallel with the input signal. Use the
following procedure to calibrate your relay.

Overvoltage

1. Adjust the SET control fully clockwise (CW) and the DELAY

control fully counterclockwise (CCW).

2. Apply the desired trip voltage to the relay.

3. Slowly (allow for the 200 ms operating time) adjust the SET

control CCW until the relay trips.

4. Reduce the applied voltage (do not change the voltage level)

and set the DELAY control to the desired time delay.

5. Apply the trip voltage to the relay and measure the time to trip.

Date

04/14

). An

nom

Copyright

2014

6. Adjust the DELAY and repeat Steps 4 and 5 until you have the

BE3-27T, BE3-59T, BE3-27T/59T

N

1) Single Phase

3) Three Phase
Three Wire

4) Three Phase
Four Wire

Sensing Input

Type

MODEL NO.

P0061-75

A) 120 Vac
B) 240 Vac
C) 380 Vac
D) 480 Vac
S) Special voltage

Nominal Input Type

1 2

1) 50/60 Hz

2) 400 Hz

Frequency

N) Not required

External Power

1) Energize to trip (59T)

2) De-energize to trip (27T)

3) Energize to trip over, de­energize to trip under (27T/59T)

Output Type

1

2

For other voltage applications, contact Basler Electric.
Voltages are line-to-line.

desired time delay.

Undervoltage

1. Adjust the SET and DELAY controls fully CCW.

2. Decrease the applied sensing voltage from the nominal value

until the desired tripping voltage is reached.

3. Slowly adjust the SET control CW until the relay trips (allow for

the 200 ms operating time).

4. Set the DELAY control to the desired time delay and apply

nominal voltage to the relay.

FIGURES

5. Step down the applied voltage from nominal to a level just

below the trip level set in Step 3 and measure the time delay.

6. Adjust the DELAY and repeat Steps 4 and 5 until the desired

time delay is achieved.

MAINTENANCE

BE3 relays are solid-state devices that require no maintenance. In
the event that your relay requires repair, contact Basler Electric,
Highland, IL, USA for return authorization.

ORDERING INFORMATION

Figure 2 shows the BE3 style number identification chart.

Publication

9319500990

Figure 1. BE3-27, BE3-59, BE3-27/59 AC Voltage Connections

Figure 2. BE3-27, BE3-59, BE3-27/59 Style Number Identification Chart

Revision

E

Instructions

Date

04/14

Page

2 of 2