Operating time characteristic test
The testing circuit is shown in Figure 6.5.15.
Single-phase
voltage
source
DC
power
supply
Start
Time
counter
Stop
OV
Figure 6.5.15 Operating Time Characteristic Test of V/F (Model 100s, 200s)
The testing procedure is as follows:
Press 4 (= Logic circuit) on the "Test" sub-menu screen to display the "Logic circuit"
screen.
Enter a signal number 81 to observe the inverse time tripping output at monitoring jack A
and press the ENTER key.
Apply a test voltage at rated frequency and measure the operating time. The magnitude of
the test voltage should be between (V setting) (L setting) and (V setting) (H setting).
Calculate the theoretical operating time using the characteristic equations shown in
Section 2.11.8 where V is the test voltage. Check that the measured operating time is from
15% to 10% of the calculated value.
6.5.2
Timer Test
The pick-up delay time of the variable timer can be measured by connecting the monitoring jacks
A and B to a time counter as shown in Figure 6.5.15. Jacks A and B are used to observe the input
signal and output signal of the timer, respectively.
DC
power
supply
Start
Time
counter
Stop
0V
Figure 6.5.16 Testing Variable Timer (Model 100s, 200s)
V
130
6 F 2 S 0 7 8 9
GRT100
TB 1 -27
V
-28
A
TB 4 - A16
Monitoring
jack
0V
- A17
E
GRT100
TB 4 - A16
Monitoring
- A17
jack
E
A
B
0V