Basler Electric BE3-25 User Manual

www.basler.com

+1 618.654.2341 (USA)

[e-mail]

INTRODUCTION

BE3-25 sync-check relays are used to ensure that two ac
circuits are synchronized. In order to be synchronized, the
frequency, phase angle, and voltage of the two circuits must
be within preset limits. When this occurs, the BE3-25 output
relay energizes. The primary application of the BE3-25 is to
enable additional generators to be brought on-line without
machine damage or system disturbance. The BE3-25 can
also be used to supervise reclosing or in any instance where
the danger of paralleling two circuits out of synchronism
exists.

SPECIFICATIONS

Inputs

All units are self-powered. Nominal voltage - 120 Vac, 240
Vac, 380 Vac, 480 Vac. For other nominal voltages, contact
Basler Electric.

Frequency

50/60 Hz or 400 Hz

Burden

GEN terminals: Less than 4 VA
BUS terminals: Less than 2 VA

Overload

Voltage: 1.25 times nominal continuously.

2 times nominal for 3 seconds.

Setpoint

Range: Adjustable 10 to 30% (±3%) of

nominal, of generator voltage (6

to 20 electrical degrees)
Repeatability: Better than 0.5% of full span
Hysteresis: Fixed at 5% of nominal
Operating Time: 500 ms, typical

Outputs

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

1200 VA
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 mm)

Model

Case: Complies with IEC 529, DIN

Case Material: Complies with UL 94VO
Weight: 1.32 lb (0.6 kg)
Size: 3.94” 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

BE3-25

40050, BS 5490

OPERATION

BE3-25 sync-check relays have one external, user­adjustable control marked SET. This control, adjustable over
a range of 10 to 30% (±3%) of nom inal , sets the acceptable
differential voltage at which synchronization will occur.
When the two inputs are within the acceptable range, the
output relay energizes and the RELAY LED lights. A
POWER LED indicates the condition of the power supply.
BE3-25 relays with a style number of 1XXN5 energize for a
synchronized condit ion or a live-generator, dead-bus
condition. This feature allows the generator to energize a
dead bus.

Setting Example

A BE3-25 relay with a nominal input rating of 120 Vac has a
SET control setting of 20%. If the bus voltage is fixed at 120
Vac, the generator voltage must be between 96 Vac and
144 Vac for the relay to energize.

STYLE CHART

Figure 1 shows the BE3-25 style chart.

INSTALLATION

BE3 sync-check 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 2 shows the
terminal connections for the BE3-25 relay.

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 meter to monitor the
voltage. Use the following procedure to calibrate your relay.

1. Adjust the SET control fully counterclockwise. Apply

nominal voltage to the BUS terminals.

2. Apply the minimum or maximum desired

synchronization voltage to the GEN terminals. This

Publication

9319100990

Revision

D

Instructions

Date

04/14

Copyright

2014

voltage should be in phase with the BUS voltage and
have the same frequency.

3. Slowly adjust the SET control clockwise until the relay

energizes.

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.

FIGURES

Figure 1. BE3-25 Style Number Identification Chart

Publication

9319100990

Revision

D

Figure 2. BE3-25 Sync-Check Relay Connections

Instructions

Date

04/14

Page

2 of 2