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6.5.1.9 Frequency element FRQ
The frequency element is checked on the following items
• Operating frequency
• Undervoltage block
Operating frequency test
The testing circuit is shown in Figure 6.5.13.
Variable
frequency
source
TB1
-27
V
-28
GRT100
Monitoring
j
ack
A
0V
+
−
TB4
-
A
16
-
A
17
E
DC
power
supply
+
−
DC
voltmeter
+
−
V
f
Figure 6.5.13 Testing Frequency Element (Model 100s, 200s)
The output signal numbers of the FRQ elements are as follows:
Element Signal number Remarks
81-1 89 Underfrequency tripping
91 Overfrequency tripping
81-2 90 Underfrequency alarm
92 Overfrequency alarm
• Press 4 (= Logic circuit) on the "Test" sub-menu screen to display the "Logic circuit"
screen.
• Enter a signal number to observe the FRQ output at monitoring jack A and press the
ENTER
key.
• Apply rated voltage and change the magnitude of the frequency applied and measure the
value at which the element operates. Check that the measured value is within
±0.03Hz of
the setting.
Undervoltage block test
•
Apply rated voltage and change the magnitude of frequency to operate the element.
• Keep the frequency that the element is operating, and change the magnitude of the voltage
applied from the rated voltage to less than UV setting voltage. And then, check that the
element resets.