158
Performing Self-test
V7AZ is provided with a function to perform self-diagnosis for opera-
tion check of the serial communication I/F circuit. This function is
called self-test. In the self-test, connect the sending terminal with the
receiving terminal in the communication section. It checks if the data
received by V7AZ is not being changed. It also checks if the data can
be received normally.
Carry out the self-test in the following procedure.
1. Turn ON the V7AZ power supply. Set constant n056 to 35 (self-
test).
2. Turn OFF the V7AZ power supply.
3. Make the following wiring with the power supply turned OFF.
4. Turn the power ON.
Normal operation: Operator displays frequency reference value.
Faulty operation: Operator displays , fault signal is turned ON and
Inverter ready signal is turned OFF.
R-
P2P1
R+
S7
S4
SC
S-
PC
S+
(Note: Select NPN side for SW1.)
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