Crouzet CONTROL RELAYS Brochure

02 / 26 / 2014

LAUNCH NOTE

NEW LEVEL & PHASE
CONTROL RELAYS

Level Control

Phase Control

New Level & Phase Control Relays

Launch Note - New Level & Phase Control Relays

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New Level Control Relays

ENR & ENRM- 22.5 mm

• 2 New part numbers will replace 8 existing part

numbers featuring:

– Filling or emptying function: E NR
– Filling or emptying with adjustable time delay: ENRM
– Multi-voltage (24 to 240 VAC/DC)
– Screw terminals

Launch Note - New Level & Phase Control Relays

– LED status indicators

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Product Specifications: ENR

U

Down

Up

1

2

3

• Monitoring filling or emptying

• Rated supply voltage: 24 to 240 VAC/DC

• Output: 1 relay 250 VAC/ 8 A resistive -

250 VDC / 0.3 A resistive

• CE, C-UL-US, CSA

– Maximum level
– Minimum level
– Output relay : Down or Up

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Product Specifications: ENR

• LEDs & connections are at different places

Old P/N 84 870 20X New P/N 84 870 200

New ENR has

increased height

and decreased

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depth

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Product Specifications: ENR M

• Monitoring filling or emptying with adjustable time delay

• Casing width: 22.5mm

• Rated supply voltage: 24 to 240 VAC/DC

• Output: 1 relay 250 VAC/ 8 A resistive -

250 VDC / 0.3 A resistive

• CE, C-UL-US, CSA

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ENRM Functions

Monitoring filling or emptying

with adjustable time delay

Monitoring a level, emptying

function, deactivation time

Monitoring a level, emptying

function, activation time

Monitoring two levels,

emptying function

Monitoring a level, filling

function, deactivation time

Monitoring two levels,

filling fun ction

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Product Specifications : ENRM

• LEDs & connections are at different places

Old P/N 84 870 21X New P/N 84 870 210

New ENRM has

increased height

and decreased

Launch Note - New Level & Phase Control Relays

depth

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New Phase Control Relay

MWS - 1 7. 5 m m

• The new MWS features:
– 8A changeover output relay
– Multi-voltage
– Screw terminals
– LED status indicators

Launch Note - New Level & Phase Control Relays

• The new MWS will replace existing:
– 17.5mm Phase sequence or phase failure

MWS (5A)

– 22.5mm Phase sequence or phase failure

EWS (8A)

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Product Specifications: New MWS

Monitoring phase sequence and phase failure

• Improved Rated supply voltage: 3 x 208 to 480 VAC (3 x 230 to 440 VAC

for old EWS)

• Output: 1 relay 250 VAC/ 8 A resistive - 250 VDC / 0.3 A resistive

• Agency approvals include CE, C-UL-US, CSA and GL

• Simple to install: MWS control relays use the controlled main supply for their

own power supply voltage. Simply install MWS phase control relay and
without any adjustment it monitors the loss or inversion of one of the phases

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Product Specifications: New MWS

Tr

Tr Tr

Off

On

0%

0%

0%

100%

100%

100%

Tr

R

L1

L2

L3

L2

L3

Td Td Td Td

Tr

Tr Tr

Off

On

0%

0%

0%

100%

100%

100%

Tr

R

L1

L2

L3

L2

L3

TdTd TdTd TdTd TdTd

Operating Principle

Phase failure

Phase sequence

Typical Wiring Diagram

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Product Specifications: New MWS

Phase Sequence Monitoring

A change of the phase sequence during operation or an incorrect phase
sequence that is applied at start-up can cause a three-phase motor to
run with reverse rotation. Certain motors when operated in the reverse
direction cause severe damage to connected loads such as pumps,
compressors and fans. Specially for portable equipment, such as
construction machinery, phase sequence detection prior to the start-up
process is highly recommended.

Phase Failure Monitoring

In case of a phase loss, undefined states of the installation are likely to
occur. E.g. the startup process of motors is disturbed. Crouzet phase
control relays detect a phase loss as soon as the voltage of one phase
drops below 100VAC.

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New Phase Control Relay

EWS2 - 22.5 mm

• The new phase sequence or phase failure relay

EWS2 features:

– 2 x 8A changeover relays
– Multi-voltage
– Screw terminals

Launch Note - New Level & Phase Control Relays

– LED status indicators

• Direct replacement of existing EWS2

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Product Specifications: EWS 2

• Monitoring phase sequence and phase failure

• Casing width: 22.5mm

• Improved Rated supply voltage: 3 x 230 to 440 VAC (3 x 230 to 415 VAC

for old EWS2)

• Output: 2 relays 250 VAC / 8 A resistive - 250 VDC / 0.3 A resistive

• Agency approvals include CE and C-UL-US

• Simple to install: EWS2 control relays use the controlled main supply for

their own power supply voltage. Simply install EWS2 phase control relay
and without any adjustment it monitors the loss or inversion of one of the
phases

• Same operative principle as the MWS phase control relay but with 2

changeover output relays

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Product Specifications: EWS 2

Front face & connections display only minor changes

Old P/N 84 873 004 New P/N 84 873 034

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Product Comparison

P/N

Output

Width

Rated
Supply
voltage

Old Offer

EMWS

(Essential)

84 903 020 84 873 020 84 892 299

5 A / 3 A 5 A 8 A

17.5 mm 17.5 mm 22.5 mm

3 x 208…
480VAC

MWS EWS

3 x 208…
480VAC

3 x 230…
440 VAC

New Offer

EMWS

(Essential)

P/N

Output

Width

Rated
Supply
voltage

84 903 020 84 873 029

5 A / 3 A 8 A

17.5 mm 17.5 mm

3 x 208…
480VAC

New MWS

3 x 208…
480VAC

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Product Characteristics: New MWS

Front face & connections display NO change

New NWS

EWS

Old P/N 84 892 299

Old P/N 84 873 020

New P/N 84 873 029

MWS

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Typical Level Control Applications

• They are used to detect the presence of liquid (e.g. seal failure) or to

control the liquid level between 1 or 2 levels.

• When controlling the level of liquid between 2 levels on a container there

are 2 possible modes: Pump Up (filling), and Pump Down (emptying).

• The most common type uses probes to measure the apparent resistance

(in kΩ) of the liquid. These are for conductive, non flammable liquids only.

• Other types can use float switches or discrete sensors.

Typical applications for Liquid Level Control Relays:

• Water treatment facilities

• Pumping stations

• Beverage vending machines

• Industrial washing machines

• Milk tanks

• Fountains

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Typical Phase Control Applications

• T hey are used to monitor 3-phase networks.

• T hey det ect when there is a phase m i s sing or when the sequence of the

phases is incorrect.

Typical applications for Phase Control Relays:

• Prot ec tion of motors against the risk of start i ng in reverse (pumps,

compressors, generators )

• Prot ecti on of motors against phas e loss or imbalance (lif ts and cranes,

pumps, elevators, c onveyors, etc.)

• Water and sewage lift st ations

• HVAC and refrigeration

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High Volume Applications (EMWS & MWS)

Phase control in Industrial Air Compressors and HVAC (Industrial
Chillers)

• Phase Control Relays are normally integrated in control panels of

medium / large size compressors.

• The function of the Phase Control Relay is to monitor the presence

and correct sequence of the 3 phases before starting the
compressor. If the compressor motor starts rotating in the wrong
direction we have the risk of damaging the compressor.

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