(1) Switching power supply circuit for outdoor control P.W.B.
Fig. 4-2 shows the switching power supply for the outdoor control P.W.B.
Table 4-1 Voltage specification
Output name Output specification Main load circuit
12 VÐ A
A cycle control system, (Each IC, Relay, Fan HIC)
B cycle control system, (Each IC, Relay)
A cycle control system, (Micro computer, Control circuits)
B cycle control system, (Micro computer, Control circuits)
Fan HIC (HIC3)
System power module A
System power module B
Fig. 4-2 Switching power supply circuit for outdoor control P.W.B.
Input voltage
230V AC
Approx.
325V DC
SW transformer 1
The switching power supply for the outdoor control P.W.B. generates the voltage of power supply to control circuits of the outdoor
parts.
The following table 4-1 shows the specification of each output voltage.
12 VÐ B
5VÐA
5VÐB
Ð5V
17 VÐ A
17 VÐ B
12 (+2.0/Ð1.5)V
12 (+2.0/Ð1.5)V
5 (±0.5)V
5 (±0.5)V
17 (+2.0/Ð1.0)V
17 (+2.0/Ð1.0)V
Ð4.5 (+2.2/Ð1.0)V
In order to check the voltage shown in Table 4-1, measure at output-indicating point with the P.W.B. by tester.
A cycle and B cycle are isolated electrically, so the potentials of 0V are different between A and B.
When you measure the voltage in A cycle <B cycle>, connect the control terminal (usually black) of a tester to V-A <OV-B>.
Take care NOT to get an electric shock in measuring voltage of the circuit. The electric potential (from the earth) of the OV-
point is more than 200V. So measuring it is attended by danger.
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