PULSAR MEASUREMENT
101
When the
duty switch
is in the “
auto
” position, n
o signals are present on
either Digital Input 3 or Digital Input 4 and devices will run in the “auto”
mode, as determined by the Zenith, in accordance with its programmed
settings. If a signal is seen on Digital Input 3,
duty switch
selected for
Pump
1
, th
en the pump connected to Relay 1 will assume the role of “lead”/ “duty”
pump, regardless of the settings programmed in the Zenith.
When the level rises to the
ON Setpoint
, for the
first
pump, relay 1 will
energise and Pump 1 will ‘start’, in the normal manner. If the level continues
to rise, then relay 2 will energise and Pump 2 will start in accordance with
the settings programmed for pump 2.
If a signal is seen on Digital Input 4,
duty switch
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 Zenith. 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.
Binary Switch Mode (P301
=
1Binary)
When a binary switch is used, to determine auto/manual duty, the number
of inputs required will be dependent on the number of devices to be
included in the duty selection. In this mode the duty device will be selected
according to the binary input present on the appropriate inputs and there is
therefore no requirement to assign the duty switch inputs to specific device
relay. The selection of the Lead/Duty device is determined by the presence
of an input as detailed in the table below, where
0
=
no input
present and
1
=
input
present
DUTY
INPUT 1
DUTY
INPUT 2
DUTY
INPUT 3
LEAD/DUTY
DEVICE
0
0
0
Auto
1
0
0
Relay 1
0
1
0
Relay 2
1
1
0
Relay 3
0
0
1
Relay 4
1
0
1
Relay 5
0
1
1
Relay 6
