Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 427 / 1956

PAGE 11
Feb 28/07 2I5
24-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(d) Overvoltage Protection Test (refer to Figure 3)
1 Revise connections as follows:
a Disconnect dummy load.
b Add 28 V relay (K1). No other connections should be on pin #2.
c Add a press-to-test (PTT) switch between power supply (A) and pin #1.
d Add resistor R3 and switch #2.
2 Open switches #1 and #2. Set power supply (B) at 11 V.
3 Set power supply (A) at 31.8 V. Depress PTT and hold for 5 seconds. No activation
should occur.
4 Increase power (A) to 32.2 V. Depress PTT. Relay should activate almost instantly.
5 Close switch #2. Increase power to 33.8 V. Depress PTT for 5 seconds. No activation
should occur.
6 Increase power to 34.5 V. Depress PTT. Relay should activate almost instantly.
Black
Blue
1
7
6
4
2
3
5
8
9
(A)
(B)
Switch 1
R2
R3
K1
+
R1
Case
+
Switch 2
PTT
V
Overvoltage Test of Alternator Control Unit
Figure 3