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If a signal is seen on Digital Input 4,
duty
selected for
Pump 2
, then the pump
connected to Relay 2 will assume the role of “lead”/”duty” pump, regardless
of the settings programmed in the Quantum
3
. When the level rises to the
ON
Setpoint
, for the
first
pump, the relay 2 will energise and Pump 2 will ‘start’,
in the normal manner. If the level continues to rise then relay 1 will energise
and Pump 1 will start in accordance with the settings programmed for pump
2.
Override
A digital input can be assigned to receive an input, which will
override
the
setpoints of the pumps and
start
them, as determined by the
Override Level
(P306)
and providing the level is above
the Min. Override
(
P303
),
immediately after the expiry of the
Override Delay
(
P302
). A digital input
can also be assigned to receive an input, which will
override
the setpoints of
the pumps and
stop
them immediately after the expiry of the
Override Delay
(
P302
).
Reset
This option is only available on Digital Input 7
P391 = 5
when selected a valid
signal received on this input will
Reset
all
Device Fail
signals to the
no fault
condition. When using this function the unit will check all inputs for such
conditions so there is no requirement to assign the input to a specific relay
output. Alternatively the
key has been allocated as a Hot Key , which when
pressed will give details of any
Device Fail
and provides prompts to
Reset
any failures to the
no fault
condition.
Digital Input Parameters
Common Par.
These parameters are common to each of the seven digital inputs and set
specific operational criteria for particular functions.
P300 Max.Attempts
When digital inputs are used to detect device failure this parameter determines
the number of attempts that will be made before failing the device and putting
it out of service. When the number of attempts is set to ‘0’, there is no
restriction on the number of starts. The digital inputs will provide a fail signal
in the normal manner and initiate any action as required, but the device will
not be put out of service. Any figure other than 0 will determine the number
of attempts that will be made to start the device before putting it out of service
until such time that the input is reset.
Set the number of attempts Min. 0, Max 99.
Содержание QUANTUM3
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