PCC-IV Instruction Manual (rev. 0.2)
Page 2-18
Section 2 - Installation
Relay Output
Typical for: CPU, and “J” boards.
This example shows Relay Output 1 on the
CPU Board.
The Relay contacts are protected from
damage due to inductive loads by a capacitor
and a 150 V Varistor. To prevent damaging
the Varistor, do not apply voltages greater
than 145 Vac across the Relay contacts.
When the Relay Contacts are Open, less than
1.8 mA of leakage current is applied to the
load through the snubber cap and Varistor.
Discrete Output, Sinking,
Internal 24 Vdc
CPU Board Only.
This example shows Discrete Output 1 on
the CPU Board.
DOUT channels are Open Collector
Transistors (i.e.
“Sinking”) with internal
clamping diodes. When active, the DOUT
conducts DC current to Power Common.
Coil loads (relays, solenoids, …) require an
additional field mounted clamp diode on
the actual coil to prevent noise induction in
adjacent field wiring.
NOTE:
Incorrect clamp diode Polarity
causes a direct short.
Each DOUT channel is rated 200 mA max.
load. See “24 Vdc Power Supply” on page 2-6
to calculate the mA current available from the
24 Vdc Power Supply.
The shield connects to the Power
Common “-”.
Discrete Output, Sinking,
External 24 Vdc
CPU Board Only.
The same comments noted above apply.
This example shows an External Power
supply being used to power the load.
The shield connects to the External Power
Supply “-”.
+
5
-
9
+24 V
PC
(Power Common)
PCC-IV
Terminals shown are
for: DOUT ch. 0-1
10
4
ch. 0-2
ch. 0-3
ch. 0-4
Clamp Diodes
Insulate
Shield
Relay
Coil
Mount Clamp Diode on Coil to
Prevent Electrical Noise
NOTE POLARITY!!
+
-
+
-
0-36 Vdc
Power Supply
+
5
-
9
+24 V
PC
(Power Common)
PCC-IV
Terminals shown are
for: DOUT ch. 0-1
10
4
ch. 0-2
ch. 0-3
ch. 0-4
Clamp Diodes
Insulate
Shield
Relay
Coil
Mount Clamp Diode on Coil to
Prevent Electrical Noise
NOTE POLARITY!!
+
-
0-36 Vdc
Power Supply
+
5
-
9
+24 V
PC
(Power Common)
PCC-IV
Terminals shown are
for: DOUT ch. 0-1
10
4
to DOUT
ch. 2-4
Surge
Clamp
Diodes
Insulate
Shield
Relay Coil
Mount Clamp Diode on Coil to
Prevent Electrical Noise
NOTE POLARITY!!
+
5
-
9
+24 V
PC
(Power Common)
PCC-IV
Terminals shown are
for: DOUT ch. 0-1
10
4
to DOUT
ch. 2-4
Surge
Clamp
Diodes
Insulate
Shield
Relay Coil
Mount Clamp Diode on Coil to
Prevent Electrical Noise
NOTE POLARITY!!
8U
7U
120 Vac max.
8A Inductive
1/2 HP, 120 Vac
PCC-IV
Terminals shown are
for: ROUT ch. 0-2
6U
NO
NC
C
Note:
"J" Option Boards
do not have NC
Terminals
8U
7U
120 Vac max.
8A Inductive
1/2 HP, 120 Vac
PCC-IV
Terminals shown are
for: ROUT ch. 0-2
6U
NO
NC
C
Note:
"J" Option Boards
do not have NC
Terminals
