Frequency Sensitive Relays
Function:
WILMAR™ Protective Relays – WOF & WUF Series
81 O/U
• ANSI/IEEE C37.90-1978
• UL file No. E58048
• CSA file No. LR61158
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.
2 1/
2
Time Delay
11
/
64
"
DIA.
4 HOLES
Standard Time Delay
Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
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.
PART NUMBER SELECTION
Typical Curves (WOF Series)
Typical Curves (WUF Series)
90
85
80
75
70
65
60
60
55
50
45
40
35
30
Overfrequency Relay
Model WOF-12-6070
58 Hz. Setting
55 Hz. Setting
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
50 Hz. Setting
70 Hz. Setting
Underfrequency Relay
Model WUF-12-5060
65 Hz. Setting
62 Hz. Setting
PART NUMBER SELECTION
Sample Part No.
Type:
WUF-12-5060-T
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Drop-Out Time Delay
Pick-Up Time Delay (sec)
PRODUCT SPECIFICATIONS
WOF/WUF
WUF = Underfrequency
WOF = Overfrequency
Input Voltage (VAC)
12 = 120
Part Number
Nominal Voltage (±20%) .................
Nonimal Frequencies .......................
Trip Point ..........................................
120, 230, 380 and 460 volts
50, 60 and 400 Hz.
23 - 230
38 = 380
Screwdriver adjustable. Adjustment range in accordance
with ordering information.
46 = 460
Frequency Range
4050 = 40-50 HZ
5060 = 50-60 HZ
6070 = 60-70 HZ
3540 = 350-400 HZ
-20oC to +65oC
Operating Temperature ....................
Differential ........................................ The frequency pitch-up to drop-out differential is .5% max
Voltage Drift .....................................
± .05% maximum frequency error for input voltage
variation of ±10%
4045 = 400-450 HZ (overfrequency only)
Time Delay Options
blank = Per Time Curve
T = Adjustable
See Time versus Frequency curves
In compliance with C37.90B ANSI/IEEE
One set N.O., one set N.C.
Time Delay ........................................
Surge Withstand Capability .............
Output Contacts ...............................
Consult factory for additional models.
5 amp resistive at 120 VAC or 28VDC
Contact Ratings ................................
Notes:
1.
2.
3.
Remove black screws for access to the frequency and the time adjustments.
Clockwise rotation of the frequency potentiometer will raise the frequency trip point.
Clockwise rotation of the time adjustment, option "T" will increase the time for overfrequency relays and
dropout time for underfrequency relays..
3 9
Tyco Electronics / www.tycoelectronics.com / Factory Direct Technical Support: 800-253-4560, ext. 2023 (U.S., Canada, Mexico) or 805-220-2020, ext. 2023 (International)
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