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CT 9000 * ADV
MAIN POWER INPUT
The line voltage enters the Power Pack through an IEC 320 power
inlet. As shown in Figure 3-3, the power inlet is wired to a 3 amp,
double pole, double throw circuit breaker. The circuit breaker
output is connected to a line filter. The chassis ground of the
power inlet and the line filter are connected to the frame.
The
filtered line voltage is input to the VOLTAGE SELECT board. The
VOLTAGE SELECT board, which is actually mounted on the main
power transformer, senses the line voltage and configures the main
power transformer's primary winding so that the secondary output
is 24VAC.
A complete description of this boards operation is given
VOLTAGE
RELAY
SENSE
CONTROL
below.
| VOLTAGE SELECT BOARD
|
|
|
|
;
!
if
|
，
|
' 12VAC
Iie
一
一 二
i
4
|
，
FILTER
|
VE
=
SV
- |
1
!
3)
|
引 5
1 12VAC
1
1
ㅣ
|
|
1
т
|
|
i
1
!
|
L
Figure 3-3. Main Power Input
3-4
800961-C
Nov. 2000
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