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6.4 Hardware Tests
The tests can be performed without external wiring, but a power supply and AC current source is
required.
The testing circuit figures used in this chapter show the circuit diagram for the 400A, 401A, 420A
and 421A models. In the case of the 402A and 422A models, TB1 replaces TB2 and TB2 replaces
TB3.
6.4.1 User Interfaces
This test ensures that the LCD, LEDs and keys function correctly.
LCD ･ LED display
• Apply the rated supply voltage and check that the LCD is off and the "IN SERVICE" LED is lit
in green..
Note: If there is a failure, the LCD will display the "ERR: " screen when the supply voltage is
applied.
• Press
key for 3 seconds or more and check that white dots appear on the whole screen and all
LEDs lit.
Operation keys
• Press ENTER key when the LCD is off and check that the LCD displays the "MAIN MENU"
screen. Press the END key to turn off the LCD.
• Press ENTER key when the LCD is off and check that the LCD displays the "MAIN MENU"
screen. Press any keys and check all keys operated.
6.4.2 Binary Input Circuit
The testing circuit is shown in Figure 6.4.1.
+
power
−
supply
Figure 6.4.1 Testing Binary Input Circuit
160
GRE110
TB 2
-13
BI1
-14
BI2
BI3
BI4
BI5
- 19
BI6
- 20
TB 1
- 13
- 14
-12
6 F 2 T 0 1 7 2
- Quick Links:
- Inverse Time Overcurrent Protection
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