Basler Electric BE3-81O User Manual

www.basler.com

+1 618.654.2341 (USA) [e-mail]

Model

BE3-81O, BE3-81U,

and BE3-81O/U

INTRODUCTION

BE3 frequency relays provide frequency monitoring and protection in both singleand three-phase systems. They are used in applications such as utility mains failure, regulation of power supplies, and to protect generators against over or underspeed. Underfrequency, overfrequency, and combined under/overfrequency units are available. BE3 frequency relays operate when the adjustable trip point is reached. A reset control is provided with an adjustment of 0.3 to 3.0% on 50 or 60 hertz units and 3 to 30% on 400 hertz units. Reset ensures that the measured parameter returns to the percent set above or below the trip point before the relay returns to the original state. On overfrequency units, the output relay energizes when the input signal exceeds the trip point. On underfrequency units, the output relay de-energizes 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

Operating Power

All units are self powered.

Nominal Voltage: 120 Vac, 240 Vac, 380 Vac, or 480 Vac

Frequency:	50 Hz, 60 Hz, or 400 Hz
Burden:	<2.5 VA per phase
Overload:	1.25 times nominal continuously.
	2 times nominal for 3 s.

Setpoint

Over/Underfrequency Set Range

50 Hz Nominal:	Adjustable 40 to 60 Hz
60 Hz Nominal:	Adjustable 50 to 70 Hz
400 Hz Nominal:	Adjustable 360 to 440 Hz
Over/Underfrequency Reset Range
50 Hz Nominal:	Adjustable 0.3 to 3.0 Hz
60 Hz Nominal:	Adjustable 0.3 to 3.0 Hz
400 Hz Nominal:	Adjustable 3.0 to 30 Hz

Setpoint range accuracy is ±3%.

Repeatability

Greater than 0.5% of full span

Operating Time

200 ms typical

Output
Relay Type:	D.P.D.T.
AC Rating:	250 V, 5	A, non-resistive,
	1,200 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)
Case:			Complies with IEC 529, DIN
			40050, BS 5490
Case Material:			Complies with UL 94VO
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

BE3-81O and BE3-81U frequency relays have two useradjustable controls marked SET and RESET. The BE381O/U has four controls: UNDER SET, OVER SET, UNDER RESET, and OVER RESET. Each SET control adjusts a relay trip point. An overfrequency trip causes the relay output to energize when the frequency rises above the SET threshold. An underfrequency trip causes the relay output to de-energize when the frequency decreases below the SET threshold. Refer to the setpoint specifications for overfrequency and underfrequency adjustment ranges. The RESET control adjusts the difference between the nominal input frequency and the reset frequency. An overfrequency reset occurs when the frequency decreases below the RESET setting. The overfrequency RESET setting is set as the percentage above Fnom where the relay will reset. An underfrequency reset occurs when the frequency increases above the RESET setting. The underfrequency RESET setting is set as the percentage below Fnom where the relay will reset. Refer to the setpoint specifications for the underfrequency and overfrequency RESET setting ranges.

Setting Example

A BE3-81O relay with a nominal input rating of 60 Hz has the following settings:

•SET - 65 Hz

•RESET - 2 Hz

Publication	Revision	Instructions	Date	Copyright
9321500990	C		04/14	2014