Function:

39

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Application:

The output contacts of frequency relays are ener-

gized when the frequency exceeds the adjustable set

point. Overfrequency and underfrequency relays are

available in 50, 60 and 400Hz. Combination over/

underfrequency “band pass” relays are also avail-

able. These are energized at rated frequency and de-

energized during overfrequency or underfrequency

conditions.

Frequency Differential relays are ener-

gized above the preset frequency. The pick-up and

drop-out frequency settings are independently ad-

justable.

Frequency Sensitive Relays

PRODUCT SPECIFICATIONS

Sample Part No.

WUF-12-5060-T

Type:

WUF = Underfrequency

WOF = Overfrequency

Input Voltage (VAC)

12 = 120

23 - 230

38 = 380

46 = 460

Frequency Range

4050 = 40-50 HZ

5060 = 50-60 HZ

6070 = 60-70 HZ

3540 = 350-400 HZ

4045 = 400-450 HZ (overfrequency only)

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 time for overfrequency relays and

dropout time for underfrequency relays..

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 ................................

WOF/WUF

120, 230, 380 and 460 volts

50, 60 and 400 Hz.

Screwdriver adjustable.

Adjustment range in accordance

with ordering information.

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

± .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 28VDC

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

11

4 HOLES

3

1

4

1

Typical Curves (WUF Series)

30

35

40

45

50

55

60

01

23

45

6

Drop-Out Time Delay

Typical Curves (WOF Series)

60

65

70

75

80

85

90

0

1

2

3456

Pick-Up Time Delay (sec)

81 O/U

WILMAR™ Protective Relays – WOF & WUF Series

Overfrequency Relay

Model WOF-12-6070

70 Hz. Setting

65 Hz. Setting

62 Hz. Setting

58 Hz. Setting

55 Hz. Setting

50 Hz. Setting

Underfrequency Relay

Model WUF-12-5060