14
Pump 1 (2, 3, 4) Disable - Functions 1 - 4
When a Discrete Input programmed as a “Pump 1 (2, 3, 4) Disable” is closed, the respective pump will be dis-
abled (not allowed to run) and skipped over in the pump call sequence. If the respective pump had been running
when the input closed, it would be turned off immediately.
Whenever a pump is disabled the next available pump is called in its place when needed. The one exception to
this, is the Alternation Sequence - Pump 1 Always Lead (Parameter P.16 = 3), where disabling pump 1 will not
result in another pump taking it’s place.
External Alternation - Function 6
Each time the Discrete Input programmed for “External Alternation“ transitions from open to closed, alternation of
the pumps will occur. It does not matter how long the input remains closed, but it must be opened to reset the
logic. If no pumps were running when the Discrete Input is closed, the alternation of the designated lead pump will
still occur. Typically this input is connected to contacts from an external Time Clock.
Sequence Input 1 (2, 3, 4) - Functions 9 - 12
When a Discrete Input programmed as a “Sequence Input 1 (2, 3, 4) ” is closed, it disables normal alternation and
forces one of the pumps to always be lead pump. For example, closing “Sequence Input 1” forces pump 1 to be
lead and sets the sequence of 1 - 2 - 3 - 4 (assuming Parameter P.16 = 1). See page 37 for connection diagrams.
The following is a description of the Functions that may be assigned to the Discrete Inputs using Parameters F.01 - F.18:
Notes: 1. All Discrete Inputs are originally programmed with default Functions, but they may be changed at any time using
Parameters F.01 - F.18.
2. Each of the Functions may only be assigned to one Discrete Input. If assigned to more than one input, the Fault
indicator will come on and Fault Code 8 will be generated.
DISCRETE INPUT FUNCTIONS
On Generator - Function 7
When a Discrete Input programmed for “Level Freeze” is first closed, the Wet Well Level is held steady or frozen
so that a bubbler system’s bubbler tube may be purge without causing the Level to jump up or down. The external
logic that performs the bubbler tube purge must provide the Discrete Input closure prior to a significant change in
the 4-20mA analog Level input. The Level Freeze logic keeps the Level frozen for 10 seconds and then releases
it, regardless of whether the Discrete Input had re-opened or not. It does not matter how long the input remains
closed, but it must be opened to reset the logic.
Level Freeze - Function 5
In cases where the Emergency Generator is not sized large enough to run all the available pumps, closing a Dis-
crete Input programmed for “On Generator” will limit the number of pumps called to run to the number preset us-
ing Parameter P.15. Typically contacts from the Transfer Switch are connected to this input.
When a Discrete Input programmed for “All Pump Disable” is closed, all the pumps are disabled (not allowed to
run), the Fault indicator will come on, the Power indicator will flash, and Fault Code 18 will be generated. This
Function also disables pump operation from Float Backup using Functions 32 - 38, or Level Probe Backup using
Parameters b.01 - b.07. The Discrete Input is typically connect to Phase Monitor contacts.
When the Discrete Input opens, the Lag Pump Delay must expire before the first pump is allowed to run. If any
additional pumps are required, the Lag Pump Delay must expire between each one called to run.
All Pump Disable - Function 8
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