4.
Remove the wires in the existing terminal blocks
and install in the pressure switch ports as shown
below:
Pressure
Pressure
Pressure Switch
Switch
Switch Port
Port
Port
Terminal
Terminal
Terminal Block
Block
Block
NO
3
COM
4
Air
Air
Air Pressure
Pressure
Pressure
System
System
System Stop
Stop
Stop Air
Air
Air State
State
State
Less than 70 psi (0.5
MPa, 5.0 bar)
System Stop Air
inactive (system run)
Greater than 70 psi
(0.5 MPa, 5.0 bar)
System Stop Air
activated (system
stop)
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.
Wire
Wire
Wire the
the
the System
System
System Stop
Stop
Stop Digital
Digital
Digital Input
Input
Input
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 106
.
The System Stop Digital input uses an optocoupler
to protect the HydroShield controls from outside
voltages.
Optocoupler
Optocoupler
Optocoupler Port
Port
Port
Connect
Connect
Connect to
to
to
13+
14
Control module
A1+
A2–
External device
or PLC
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
A1+
A1+
A1+ (relative
(relative
(relative to
to
to A2–)
A2–)
A2–)
System Stop: Digital
activated (system stop)
24 VDC
System Stop: Digital
inactive (system run)
Less than 13.5 VDC
3A8492A
25
Содержание HydroShield WABH00
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