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6.5.1.10 Overexcitation element V/F
The overexcitation element is checked on the following items
• Operating value of definite time tripping and alarm characteristic
• Operating time of inverse time tripping characteristic
The output signal numbers of the V/F elements are as follows:
Element Signal number Remarks
V/F 80 Definite time tripping
81 Inverse time tripping
82 Definite time alarm
Operating value test for definite time tripping and alarm
The testing circuit is shown in Figure 6.5.14.
Single-phase
voltage
source
TB1
-27
V
-28
GRT100
Monitoring
j
ack
A
0V
+
−
TB4
-
A
16
-
A
17
E
DC
power
supply
+
−
DC
voltmeter
+
−
V
Figure 6.5.14 Operating Value Test of V/F (Model 100s, 200s)
• Set V (rated voltage setting) to 100V.
• Press 4 (= Logic circuit) on the "Test" sub-menu screen to display the "Logic circuit"
screen.
• Enter a signal number 80 or 82 to observe the V/F output at monitoring jack A and press the
ENTER
key.
• Apply a test voltage at rated frequency and increase the magnitude of the voltage applied
and measure the value at which an alarm signal or a trip signal is output.
Check that the measured values are within 2% of (V setting)
× (A setting) for an alarm
signal and (V setting)
× (H setting) for a trip signal.