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Operating time characteristic test
The testing circuit is shown in Figure 6.5.15.
Single-phase
voltage
source
TB1
-27
-28
V
GRT100
Monitoring
j
ack
A
0V
E
TB4
-
A
16
-
A
17
DC
power
supply
+
−
Start
Time
counter
OV
Stop
V
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.
Note: Set the swich [Reset] to “Off”→ “On”→ “Off” to initialize a time count. See Section 4.2.7.1.
• 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.
TB4
-
A
16
-
A
17
E
GRT100
DC
power
supply
+
−
Monitoring
j
ack
A
0V
B
Time
counter
Start
Stop
0V
Figure 6.5.16 Testing Variable Timer (Model 100s, 200s)