PCC-IV Instruction Manual (rev. 0.2)
Page 2-17
Section 2 - Installation
120 Vac Discrete Inputs, CPU Board
CPU Board Only.
This example shows Discrete Input 1 on the
CPU Board.
The Neutrals for the 5 Discrete Input channels
on the CPU board are connected internally.
Specifications:
> 90 Vac = ON
< 3 mA = OFF
Input Impedance = 8 k (+/- 20%)
Typical Input Current = 15 mA
120 Vac Discrete Inputs, “J” Board
Isolated Neutrals
“J” Board Only.
This example shows Discrete Input 1 on a
“J” Option Board that is plugged into
Slot 1.
Each Discrete Input has a separate isolated
Neutral which is isolated from all other channels
and from the CPU Neutral.
If Isolation is not desired, jumpers on the JP1
jumper block interconnect the channel Neutrals.
Each jumper connects an individual channel
Neutral to an isolated inter-channel tie bus.
Therefore, two jumpers would have to be
installed to connect the Neutrals of two different
channels.
The CPU AC Neutral (terminal 1U) does not
connect to the “J” board. An external wire must
be run if these isolated Neutrals need to be
connected.
4L
1L
PCC-IV
Terminals shown are
for: DI ch. 0-1
.33 uF
120
.33 uF
120
1U
Optical
Isolator
Neutrals
from DI ch.
0-2 -> 0-5
PCC III 120 Vac
Power Supply
Neutral
AC
Grounded
Neutral
(Per NEC Code)
Field "Hot" and PCC
III "Hot"
can be different
phases.
Neutral
120 Vac
Hot
to PS xfmr
4L
1L
PCC-IV
Terminals shown are
for: DI ch. 0-1
.33 uF
120
1U
Optical
Isolator
Neutrals
from DI ch.
0-2 -> 0-5
PCC III 120 Vac
Power Supply
Neutral
AC
Grounded
Neutral
(Per NEC Code)
Field "Hot" and PCC
III "Hot"
can be different
phases.
Neutral
120 Vac
Hot
to PS xfmr
1-45
1-44
PCC-IV
Terminals shown are
for: DI ch. 1-1
.33 uF
120
.33 uF
120
Optical
Isolator
Isolated from
ch.<->ch. and
CPU AC Neutral
JP1 Jumpers can be used to
interconnect "Nx" Terminals. N1
<-> N4 are always isolated from
CPU board AC Neutral.
AC
Neutral
120 Vac
Hot
N1
H1
ch. 2
ch. 3
ch. 4
1-45
1-44
PCC-IV
Terminals shown are
for: DI ch. 1-1
.33 uF
120
Optical
Isolator
Isolated from
ch.<->ch. and
CPU AC Neutral
JP1 Jumpers can be used to
interconnect "Nx" Terminals. N1
<-> N4 are always isolated from
CPU board AC Neutral.
AC
Neutral
120 Vac
Hot
N1
H1
ch. 2
ch. 3
ch. 4
