Basler Electric BE3-74SH User Manual

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INTRODUCTION

BE3 dc millivolt sensing relays provide voltage monitoring
and protection for any application where dc voltage levels
are critical. A common application is overcurrent protection
for dc charging systems. Millivolt input signals from shunts,
sensors, or transducers can provide the input signals.
Undervoltage, overvoltag e, and combi ned ov er/un der v olt age
units are available. A time delay control provides an
adjustment of 0 to 10 seconds (operating time is typically
200 ms). This time delay may be used to prevent false
tripping when there are slight variations in the input signal.
BE3 dc millivolt sensing relays operate when the 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

Frequency: 45 to 65 Hz
Impedance: 100 Ω max
Overload: 10 times nominal continuously

Burden

Vac: 2 VA
Vdc: <3 W

Sensing Input

Nominal Voltage: 50 mVdc, 100 mVdc, and 10 to

Impedance: 50 kΩ

Setpoint

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

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

Time Delay: Adjustable 0 to 10 s
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,

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

Publication

9320800990

+1 618.654.2341 (USA)

Vac, or 24 Vdc

99 mVdc (specify nominal range)

nominal

nominal

1200 VA

Revision

C

Instructions

Model

BE3-74SH, BE3-74SL,
and BE3-74SD

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)

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

BE3-74SH and BE3-74SL dc millivolt sensing relays have
two user-adjustable controls marked SET and DELAY. The
BE3-74SD has four controls: UNDER SET, UNDER DELAY,
OVER SET, 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 40
to 120% (±3%) of nominal input (V
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.
The time delay is the amount of time that elapses after the
trip point is reached and when the output relay operates.

Setting Example

A BE3-74SH relay with a nominal input rating of 100 mVdc
has the following settings:

• SET - 80%

• DELAY - 4 s

A trip occurs when the sensing voltage rises above 80 mVdc
and 4 seconds elapse. Reset occurs when the voltage
decreases below 75 mVdc (5% of nominal below the
setpoint).

). An undervoltage trip

nom

Date

03/14

Copyright

2014

INSTALLATION

BE3 dc millivolt 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 BE3-74SH, BE3-74SL, and BE3­74SD 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 millivolt meter in
parallel with the input signal. Use the following procedure to
calibrate your relay.

Overvoltage

1. Adjust the SET control fully clockwise and the delay

control fully counterclockwise.

2. Apply the desired trip voltage to the relay.

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

SET control counterclockwise until the relay trips .

4. Remove the applied voltage (do not change the voltage

level) and set the DELAY control to the desired time
delay.

FIGURES

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

to trip.

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

have the desired time delay.

Undervoltage

1. Adjust the SET and DELAY controls fully

counterclockwise.

2. Decrease the applied sensing voltage from the nominal

value until the desired tripping voltage is reac hed.

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

SET control clockwise until the relay trips.

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

apply nominal voltage to the relay.

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 relay style chart.

Publication

9320800990

Figure 1. BE3-74SH, BE3-74SL, and BE-74SD Input Connections

Figure 2. BE3-74SH, BE3-74SL, and BE3-74SD Style Number Identification Chart

Revision

C

Instructions

Date

03/14

Page

2 of 2