Datasheet

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ESG 5.14

3-phase voltage monitoring relay

EMR SU31D

Functions

Monitoring of phase sequence, phase failure and detection of return

voltage (by means of evaluating the asymmetry).

• Voltage monitoring in 3-phase mains

• Measuring range 400/230 Vac 3Ph

• Monitoring of phase sequence and phase failure

• Detection of reverse voltage

• Connection of neutral wire optional

• 2 changers

Reference data

Selectron

EMR Article no.

SU31D 400/230 Vac 3Ph 41230019

(Order data see chapter 1)

Connecting voltages

3(N) ~400/230 V, Terminals (N)-L1-L2-L3 (= supply voltage)

100% duration of operation

Indicators

Green LED ON: indication of supply voltage

Yellow LED ON/OFF: indication of relay output

Output relay

1 NC contact / 1 NO contact

Rated voltage: 250 Vac

Switching capacity: 1250 VA (5 A / 250 Vac)

Fusing: 5A fast acting

EMR SU31D

Summary of content (8 pages)

PAGE 1
3-phase voltage monitoring relay EMR SU31D • Voltage monitoring in 3-phase mains • Measuring range 400/230 Vac 3Ph • Monitoring of phase sequence and phase failure • Detection of reverse voltage • Connection of neutral wire optional • 2 changers Functions Monitoring of phase sequence, phase failure and detection of return voltage (by means of evaluating the asymmetry).
PAGE 2
3-phase voltage monitoring relay EMR DU31D Technical data Nominal voltage Nominal frequency Drop-out voltage Recovery time Measuring circuit: Input: 3(N) ~400/230 V Overload capacity: 3(N) ~400/230 V Input resistance: 3(N) ~400/230 V Asymmetry: 3(N) ~400/230 V, 9 VA / 2 W 48 ... 63 Hz >20% of the nominal voltage 500 ms terminals (N)-L1-L2-L3 (= supply voltage) -30% ... +30% according to nominal voltage 9 VA / 2 W fix circa 30% Type key EMR Construction D S Industrial design 22.
PAGE 3
-phase voltage monitoring relay EMR DU31D Function description LED U L1 L2 L3 L2 L1 L2 L3 Detection of reverse voltage (by means of evaluation of asymmetry) The output relays switch into off-position (yellow LED not illuminated) when the asymmetry between the phase voltages exceeds the fixed value of the asymmetry. An asymmetry caused by the reverse voltage of a consumer (e.g. a motor which continues to run on two phases only) does not effect the disconnection. LED U Asym.
PAGE 4
ESG 5.
PAGE 5
3-phase voltage monitoring relay (Multifunction) EMR SU31C1, SU31D1 • Voltage monitoring in 3-phase mains • Measuring range 230/132 / 400/230 Vac 3Ph • Multifunction • Monitoring of phase sequence and phase failure • Additional asymmetry monitoring • Connection of neutral wire optional • 2 changers EMR SU31C1 Functions Voltage monitoring in 3-phase mains with adjustable thresholds, adjustable tripping delay, monitoring of phase sequence and phase failure, monitoring of asymmetry with adjustable threshold
PAGE 6
3-phase voltage monitoring relay (Multifunction) EMR SU31C1, SU31D1 Technical data Nominal voltage Nominal frequency Drop-out voltage Base accuracy Adjustment accuracy Repetition accuracy Temperature influence Recovery time Measuring circuit: Measured variable Input: 3(N) ~132/230 V 3(N) ~230/400 V Overload capacity: 3(N) ~132/230 V 3(N) ~230/400 V Input resistance: 3(N) ~132/230 V 3(N) ~230/400 V Switching threshold: Max: Min: Asymmetry: 3(N) ~230/132 V, 6 VA (2 W) 3(N) ~400/230 V, 9 VA (2 W) 48 ...
PAGE 7
3-phase voltage monitoring relay (Multifunction) EMR SU31C1, SU31D1 Function description For all the functions the LEDs MIN and MAX are flashing alternating, when the minimum value for the measured voltage was chosen to be greater than the maximum value. If a failure already exists when the device is activated, the output relays remain in off-position and the LED for the corresponding threshold is illuminated.
PAGE 8
3-phase voltage monitoring relay (Multifunction) EMR SU31C1, SU31D1 Shift of the star-point (asymmetry) through unequal phase-load with missing neutral wire L1 N L3 L2 Loss of neutral wire by means of evaluation of asymmetry A break of the neutral wire between power line and machinery is detected as soon as asymmetry between phase-to-phase voltage and neutral wire occurs.