Basler Electric BE3-74VL User Manual

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INTRODUCTION

BE3 dc voltage sensing relays provide voltage monitoring
and protection for any application where dc voltage levels
are critical. Undervoltage, overvoltage, and combined
under/overvoltage units are available. BE3 dc voltage
sensing relays operate when the externally adjustable trip
point is reached. On overvoltage units, the output relay
energizes when the input signal exceeds the trip point. On
undervoltage units, the output relay de-energizes when the
input signal falls below the trip point. A red LED indicates
the state of the relay. A green LED indicates the condition of
the power supply.

SPECIFICATIONS

Operating Power

All units require external operating power.
Nominal Voltage: 120 Vac, 240 Vac, 380 Vac,

480 Vac, or 24 Vdc

Frequency: 45 to 65 Hz

Burden

Vac: 2 VA
Vdc: <3 W

Sensing Input

Nominal Voltage: 1.0 Vdc, 10 Vdc, 100 Vdc, or 1 to

300 Vdc (specify nominal range)
Burden: 10 kΩ/V
Overload: 1.25 times nominal continuously

or 2 times nominal for 3 s

Setpoint

Undervoltage Range: Adjustable 0 to 80% (±3%) of

nominal
Overvoltage Range: Adjustable 40 to 120% (±3%) of

nominal
Repeatability: Greater than 0.5% of full span
Differential: Fixed at 5% of nominal
Operating Time: 200 ms typical

Output

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

Model

BE3-74VL, BE3-74VH,

and BE3-74VD

Physical

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

7.5 mm)

Case: Complies with IEC 529, DIN

40050, BS 5490

Case Material: Complies with UL 94VO

Weight

Single Unit: 0.88 lb (0.4 kg)
Combined Unit: 1.32 lb (0.6 kg)

Size

Single Unit: 2.17” wide (55 mm)
Combined Unit: 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

BE3-74VH and BE3-74VL dc voltage sensing relays have
one user-adjustable control marked SET. The BE3-74VD
has two controls: UNDER SET and OVER SET. 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 40 to 120% (±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 0 to 80% (±3%) of
nominal input.

Setting Example

A BE3-74VH relay with a nominal input rating of 100 Vdc
has the following setting:

• SET - 80%

A trip occurs when the sen sin g voltage ris es abo ve 80 Vdc.
Reset occurs when the voltage falls below 75 Vdc (5% of
nominal below the setpoint).

INSTALLATION

BE3 dc voltage sensing 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
input connections for the BE3-74VL, BE3-74VH, and BE3­74VD relays.

nom

). An

Publication

9321400990

Revision

D

Instructions

Date

04/14

Copyright

2014

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 clock wise.

2. Apply the desired trip voltage to the relay.

3. Slowly adjust the SET control cou nterclockwise until the

relay trips.

FIGURES

Undervoltage

1. Adjust the SET control fully counterclockwise.

2. Decrease the applied sensing voltage from the nominal

value until the desired tripping voltage is reac hed.

3. Slowly adjust the SET control clockwise until the relay

trips.

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 d c voltage sen sin g relay style
number identification chart.

Publication

9321400990

Figure 1. BE3-74VL, BE3-74VH, and BE-74VD Input Connections

Figure 2. BE3-74VL, BE3-74VH, and BE3-74VD Style Number Identification Chart

Revision

D

Instructions

Date

04/14

Page

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