Frequency Sensitive Relays
WILMAR™ Protective Relays – WOF & WUF Series
Function:
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
Note:
Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
Typical Curves (WOF Series)
90
85
Overfrequency Relay
Model WOF-12-6070
5
/
8
3
8
1
/
4
2
1
/
4
3 /
1 4
4 /
1 2
DIA.
4 HOLES
11 64
"
/
Time Delay
Standard Time Delay
A minimum, fixed inverse time delay is incorporated in
PART NUMBER SELECTION
all frequency relays to prevent nuisance tripping and is
represented by the typical curves shown below.
58 Hz. Setting
55 Hz. Setting
Typical Curves (WUF Series)
60
55
50
45
80
50 Hz. Setting
75
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
70 Hz. Setting
70
40
35
30
65
65 Hz. Setting
62 Hz. Setting
0
1
2
3
4
5
6
Underfrequency Relay
Model WUF-12-5060
0
1
2
3
4
5
6
PART NUMBER SELECTION
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.
60
Pick-Up Time Delay (sec)
Drop-Out Time Delay
PRODUCT SPECIFICATIONS
Part Number
WOF/WUF
Nominal Voltage (±20%)
.................
120, 230, 380 and 460 volts
Nonimal Frequencies ....................... 50, 60 and 400 Hz.
Trip Point .......................................... Screwdriver adjustable. Adjustment range in accordance
with ordering information.
Operating Temperature .................... -20
o
C to +65
o
C
Differential ........................................
The frequency pitch-up to drop-out differential is .5% max
Voltage Drift .....................................
±
.05% maximum frequency error for input voltage
variation of
±10%
Time Delay ........................................ See Time versus Frequency curves
Surge Withstand Capability ............. In compliance with C37.90B ANSI/IEEE
Output Contacts ............................... One set N.O., one set N.C.
Contact Ratings ................................ 5 amp resistive at 120 VAC or 28VDC
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..
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)
39
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