SDS Series
52
CURRENT DRAW:
DataCoils draw current as follows:
SD2NC: Idle = 1.5 mA | Running = 16 mA
SD3NO: Idle = 1.5 mA | Running = 21 mA
SD3LT: Idle = 1.5 mA | Running = 1.5 mA
If a total current draw exceeds 1500mA, the controller will indicate a short circuit condition. If
the total current load exceeds 900mA, the green two-wire LED will flash. This condition will be
either partial short circuit or could indicate the short is at a distant point in the cable from the
controller.
See illustration on next page (53).
Fault Finding
FAULT FINDING FIELD VALVES AND CABLE:
The patented two-way communication between the valves and the controller makes it possi-
ble to instantly observe the performance of the field valves. By doing this, faulty DataCoils™
and cable problems are quickly identified.
In the controller TWO-WIRE menu, the Valves Online function can be accessed. This will
display all valves within the system and display if they are online or offline.
The communication protocol is biased towards the forward channel i.e. switching the valves.
The back channel is split into two separate areas - reporting status of the valves (1) and the
DataNode sensor functions (2).
The status reporting of valves online or offline can be relied upon if the two-wire cable is in-
stalled correctly and has good wire connections. with no leakage to earth caused by a break-
down in the wire insulation or substandard installation.
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