Sigma Controls MYRIAD DPC Instruction Manual page 29

29
APPENDIX 'C'
AUXILIARY PCB ADDENDUM
VERSION 4.0
The auxiliary PCB option adds standardized inputs and outputs to the DPC
controller. These are some of the most commonly requested custom programming
functions. This PCB is hard soldered at the factory. It is not user serviceable. Its
existence is indicated by a 10 pin terminal on the back of the controller.
Terminals 1&2 are for a 3 position switch labeled 'PUMP 1-AUTO-PUMP 2'. When
the #1 terminal is closed it assigns the lead to pump 1 and lag to pump 2. When
the #2 terminal is closed it assigns the lead to pump 2 and lag to pump 1. When
both inputs are open, alternation is controlled by the selected alternation mode.
Terminal #3 can be used as a normally closed shutdown or a low float cutoff to
stop the pumps on a low water condition. Disable this when not in use to avoid the
need for a jumper.
Terminals #4&5, when Float Control is disabled, can be used as separate seal
leak alarm inputs. The standard DPC has one input that is shared by both pumps
to indicate a seal failure. This option allows pump 1 seal leak to be connected to
#4 and pump 2 seal leak to be connected to #5
Terminal #6, when Float Control is disabled, can be used to sinc a 24VDC relay.
This relay will engage when either pump is on. This is commonly used for
chemical pumps that need to dose when a pump is running.
Terminal #7 can be used to sinc a 24VDC relay. This relay will engage when any
alarm occurs. It will disengage when silenced by touching any key or a reset
pushbutton. This is not disabled by the Alarm Horn setting in the Setup menu.
That is for the internal horn only.
Terminal #8 can be used for a momentary normally open reset pushbutton.