User's Manual

CHAPTER3
TheVALVEConnector
18
Figure 11. The Valve Connector
 WARNING Do not use only one COM wire for all valves.
Connect the positive terminals (commonly red) of the valve to the
corresponding Valve1-4 pins and the negative terminals (commonly
black) to the COM pins.
 WARNING Be sure to check the cabling, otherwise one or more valves will switch
to ON state when the RTU enters misery mode or upon a reset of the
RTU.
Note: COM wires brown and green should be used for valve1 and valve2,
pink and blue for valve3 and valve4.
The cable colors of your valve may differ from this scheme. Please
consult the manufacturer of your valves.
Note: When the polarity is reversed, the valve operation is also reversed.
The user can check the correct cabling with the power up sequence of
the A724.
 WARNING Be sure to check the cabling for shortcuts because the RTU can be
damaged when it is operated with improper connections.
When the A724 starts up (e.g. the battery is connected), it
immediately sends OFF commands to all valves (sequential).
Valve1
COM
Valve3
Valve2
Valve4
COM
1
4
6
2
5
3
Table 2. Valve Connector Signals and Cable Colors
Signal Switchcraft pin Color
Valve1 1 white
COM 2 brown, green
Valve2 4 yellow
Valve3 5 gray
COM 3 pink, blue
Valve4 6 red