Function:

40

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The output contacts of frequency relays are ener-

gized when the frequency exceeds the adjustable

set point.

Overfrequency and underfrequency re-

lays are available in 50, 60 and 400Hz. Combination

over/underfrequency “band pass” relays are also

available.

These are energized at rated frequency

and

de-energized

during

overfrequency

or

underfrequency conditions.

Frequency Differential

relays are energized above the preset frequency.

The pick-up and drop-out frequency settings are

independently adjustable.

Operation:

The relay will energize at normal frequency; The

normally closed contacts will open and the normally

open contacts will close. The relay will drop-out after

time delay at overfrequency or underfrequency.

Frequency Sensitive Relays

PRODUCT SPECIFICATIONS

Sample Part No.

WOUF-12-5060-T

Type:

WOUF = Over/Underfrequency

Input Voltage (VAC)

12 = 120

23 - 230

38 = 380

46 = 460

Frequency Range

UF Adj.

OF Adj.

50 =

40-50 Hz

50-60 Hz

60 =

50-60 Hz 60-70 Hz

400 =

350-400 Hz400-450 Hz

Time Delay Options

blank = Per Time Curve

T = Adjustable

Consult factory for additional models.

PART NUMBER SELECTION

Notes:

1.

Remove black screws for access to the frequency and the time adjustments.

2.

Clockwise rotation of the frequency potentiometer will raise the frequency trip point.

3.

Clockwise rotation of the time adjustment, option "T" will increase the drop-out time delay.

PART NUMBER SELECTION

Part Number

Nominal Voltage (

±20%) .................

Nonimal Frequencies .......................

Trip Point ..........................................

Operating Temperature ....................

Differential ........................................

Voltage Drift .....................................

Time Delay ........................................

Surge Withstand Capability .............

Output Contacts ...............................

Contact Ratings ................................

WOUF Series

120, 230, 380 and 460 volts

50, 60 and 400 Hz.

Screwdriver adjustable.

Adjustment range in

accordance with ordering information.

The frequency pick-up to drop-out differential is .5% max

± 0.05% maximum frequency error for input voltage

variation of

±10%

See Time versus Frequency curves

In compliance with C37-90B ANSI/IEEE

One set N.O., one set N.C.

5 amp resistive at 120 VAC or 28 VDC

Time Delay

Standard Time Delay

A minimum, fixed inverse time delay is incorporated in

all frequency relays to prevent nuisance tripping and is

represented by the typical curves shown below.

Adjustable Time Delay

If additional time delay is required, a suffix "T" must be

added to the part number. This allows the minimum

fixed time delay to be field-adjustable up to 20 seconds

Typical Curves (WOUF Series)

30

40

50

60

70

80

90

012

3

456

Drop-Out Time Delay

11

4 MTG. HOLES

3

3

1

4

1

TERMINAL

STRIPS

#6 -

32 SCREWS

81 O/U

WILMAR™ Protective Relays – WOUF Series, Over/Underfrequency