Basler Electric BE3-74TD User Manual
Instructions
www.basler.com
+1 618.654.2341 (USA)
Model
BE3-74TD, BE3-74TH,
and BE3-74TL
INTRODUCTION
BE3 milliamp sensing alarm relays monitor analog signals
from transducers that measure current, voltage, watts, hertz,
vars, or power factor. These transducers are used to
indicate the status of a system or component. BE3-74T
relays operate when the adjustable trip point is reached. An
adjustable time delay is provided to avoid nuisance tripping
due to transient changes in sensed current. All BE3 milliamp
sensing alarm relays have a POWER LED to indicate the
condition of the power supply. BE3-74TL and BE3-74TH
relays have a RELAY LED to indicate the trip output status.
The BE3-74TD relay has an OVER LED to indicate
overcurrent trip and an UNDER LED to indicate an
undercurrent trip.
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 Current:
0 to 1 mA, 4 to 20 mA, or 0 to
20 mA (specify nominal range)
Burden:
10 k
Ω/V
Overload:
2 times nominal continuously or
10 times nominal for 3 s
Setpoint
Overcurrent Range:
Adjustable 40 to 120% (
±3%) of
nominal
Undercurrent Range:
Adjustable 0 to 80% (
±3%) of
nominal
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,
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)
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
BE3-74TH and BE3-74TL relays have two user-adjustable
controls marked SET and DELAY. The BE3-74TD relay has
four controls: UNDER SET, UNDER DELAY, OVER SET,
and OVER DELAY. The SET control adjusts the relay trip
point. An overcurrent trip causes the relay output to energize
when the current rises above the SET threshold. The
overcurrent SET level is adjustable from 40 to 120% (
±3%)
of nominal input (I
nom
). An undercurrent trip causes the relay
output to de-energize when the current decreases below the
SET threshold. The undercurrent SET level is adjustable
from 0 to 80% (
±3%) of I
nom
. The DELAY control adjusts the
time from when a fault is detected until the output contacts
change state. The DELAY control is adjustable from 0 to 10
seconds (200 ms typical operating time).
Setting Example
A BE3-74TD with a nominal input type of M (4 to 20 mA) has
the following settings:
•
UNDER SET - 50%
•
UNDER DELAY - 5 s
•
OVER SET - 100%
•
OVER DELAY - 5 s
An undercurrent condition is detected when the sensed
current decreases to 10 mA. The UNDER output de-
energizes 5 seconds after the undercurrent condition is
detected. An overcurrent condition is detected when the
sensed current increases to 20 mA. The OVER output
energizes 5 seconds after the overcurrent condition is
detected.
INSTALLATION
BE3 dc milliamp sensing alarm 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,
Publication
9321100990
Revision
C
Instructions
Date
04/14
Copyright
2014