DC Power Technologies FS3 Version 3 - Technical Hardware Manual - Manual (Page 29)

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Relay Configuration for External Applications
The on-board relays fitted to the MPC controller allow control of
external devices such as lights, indicators or Auto Watering.
Jumpers for each relay allow setting of the default state, NO
(Normally Open) or NC (Normally Closed).
Relay Function Notes
1 Charge
complete BSI option must be enabled in
Controller Settings
2 Auto Watering Auto Watering must be enabled in
Configuration tab
3 Charge Active BSI option must be enabled in
Controller Settings
4 Alarm 1 Relay Alarm mode must be enabled in
Controller Settings
5 Alarm 2 Relay Alarm mode must be enabled in
Controller Settings