Toshiba GRT100 Series, Instruction Manual

Page: 130 / 270

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129
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6 F 2 S 0 7 8 9
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
81
82
Definite time tripping
Inverse time tripping
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
TB 1 -27
V
-28
GRT100
Monitoring
jack
A
0V


TB 4 - A16
- A17
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.