Wire The System Stop Digital Input - Graco HydroShield WABH00 Instructions - Parts Manual

4. Remove the wires in the existing terminal blocks
and install in the pressure switch ports as shown
below:
Pressure Switch Switch Port Port
Pressure Pressure Switch Port
NO
COM
Air Pressure Pressure
Air Air Pressure
Less than 70 psi (0.5
MPa, 5.0 bar)
Greater than 70 psi
(0.5 MPa, 5.0 bar)
5. Remove unused terminal blocks after connecting
the wires to the pressure switch ports.
6. Connect approximately 1 foot of 5/32" tube from
the pressure switch to the bulkhead on the inside
of the electronics panel.
7. Connect approximately 2 feet of 5/32" tube from
that bulkhead on the electronics panel to the
bulkhead on the side of the unit.
3A8492A
Terminal Terminal Block Terminal Block Block
3
4
System Stop System System Stop Air Stop Air Air State State State
System Stop Air
inactive (system run)
System Stop Air
activated (system
stop)
Wire the the System System Stop
Wire Wire the System
The System Stop Digital input provides a means to
signal the HydroShield system to stop. This normally
open contact turns the system off when activated.
If the input is read as CLOSED, it stops system
operation and puts the system into Off mode. If the
input is read as OPEN, the system operates normally.
Prepare the electrical controls
for service. Follow the steps in
Prepare the Electrical Controls for Service, page
The System Stop Digital input uses an optocoupler
to protect the HydroShield controls from outside
voltages.
Optocoupler Port Port
Optocoupler Optocoupler Port
13+
14
A1+
A2–
Apply the 24 VDC signal to A1+ and GND to A2–.
Only one A2– port needs to be connected to GND, as
the two ports labeled A2– are connected internally.
Function Function Function
System Stop: Digital
activated (system stop)
System Stop: Digital
inactive (system run)
Installation
Stop Digital Digital Input Input
Stop Digital Input
Connect to to to
Connect Connect
Control module
External device
or PLC
A1+ A1+ (relative A1+ (relative (relative to to to A2–) A2–) A2–)
24 VDC
Less than 13.5 VDC
106.
25