SECTION 5 • TESTING
INTRODUCTION
The following procedures verify proper relay operation and calibration.
Results obtained from these procedures may no fall within specified tolerances. When evaluating results,
con
sider three prominent factors:
• Test eq
uipment accuracy
• Testin
g method
• Ex
ternal test set components tolerance level
REQUIRED TEST EQUIPMENT
Minimum test equipment required for relay testing and adjustment is listed below. Refer to Figure 5-1 for
the test setup.
NOTE
Commercially available frequency relay test sets with frequency and time
generating accuracies exceeding those of the relay and including electronic
switching, may be used.
• Appropriate ac or dc power source for relay operation.
• Appro
priate ac source for frequency sensing. (A source with frequency stability of 0.00002 Hz must
exhibit phase noise of less than 90 db for accurate measurement. The accuracy and stability of this
source is necessary as the relay precisely measures the period between positive going zero-
crossings of the applied waveform and responds instantaneously to the sensed condition.)
• Ha
rdware (battery and lamp, multimeter, etc.) or method of determining that the output contacts
close.
OPERATIONAL TEST
Power Supply Status Output (Option 2-A or B)
Step 1. With the unit in a powered-up condition, verify that the power supply status output contacts
are e
nergized open.
Step 2. Remove input power and verify that the status output contacts close.
Pickup
Step 1. Connect the test circuits shown in Figure 5-1 as necessary for the functions included in your
rela
y model. See Table 5-1. Turn all undervoltage pickup controls fully CCW and all
overvoltage pickup functions fully CW. Set all time delay controls to 00. Adjust T1 to nominal
voltage for your sensing input range as indicated below.
Sensing Input Range
2 3 4
120 Vac 120 Vac 240 Vac
NOTE
Results assume normally open output contacts. Test indicator states will be
opposite for normally closed output contacts.
9170600990 Rev H BE1-27/59 Testing 5-1
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