Page 136
When the duty switch is in the “auto” position, no signals are present on
either Digital Input 3 or Digital Input 4 and devices will run in the “auto”
mode, as determined by the Twin, in accordance with its programmed
settings. If a signal is seen on Digital Input 3, duty switch selected for
Pump 1, then the pump connected to Relay 1 will assume the role of
“lead”/”duty” pump, regardless of the settings programmed in the Twin.
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 Twin. 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 (P*301 = 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
To Next Page
Loading...
Need help?
General
