Basler BE1-27, Instruction Manual

Page: 37 / 43

TESTS AND ADJUSTMENTS 5-1
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.
SECTION 5 • TESTS AND ADJUSTMENTS
GENERAL
Procedures in this section are for use in testing and adjusting a relay for the desired operation in a protective
scheme. If a relay fails an operational test, or is an adjustment discloses a faulty relay, refer to Section 6.
REQUIRED TEST EQUIPMENT
Minimum test equipment required for relay testing and adjustment is listed below. Refer to Figure 5-1 for
the test setup.
a. Appropriate ac or dc power source for relay operation.
b. Appropriate 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.)
c. Hardware (battery and lamp, multimeter, etc.) or method of determining that the output contacts close.
OPERATIONAL TEST PROCEDURE
The following procedure verifies operation and calibration of the relay. It should be noted that the results
obtained from this procedure may not fall strictly within specified tolerances. When evaluating results,
consideration must be given to three prominent factors:
1. The inherent error of test equipment. Test equipment should be accurate within 1% or better.
2. The inconsistent method of testing. (Example: The timer will start before the K1a contacts close.)
3. The tolerance level of components used in the test setup.
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
energized open.
Step 2. Remove input power and verify that the status output contacts close.
Pickup
Step 1.
Connect the test circuit shown in Figure 5-1 as necessary for the functions included in your relay
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