DP Megacontrol Series, Installation And Operating Instructions Manual

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In system whit a big difference in the flow/capacity of
the pumps you can delay the switch on and switch off
of the following pump(s)
Par. 3-6-15-1
Function Switch on delay
If a time is set in this parameter there is an delay to
switch on the next pump after the discharge pressure
has dropped beneath the set point.
Par. 3-6-15-2
Function Switch off delay
If a time is set in this parameter there is an delay to
switch off the a pump after the discharge pressure is
above the set point.
9.8.5 By Pass Valve par. 3-14
Par. 3-14-1
Function off:
No function is selected
Function Check run:
Extra parameters needed
Par. 3-14-2 Open delay
Par. 3-14-3 Close delay
Par. 3-8-2-1 / 3-8-2-6 Selection of the digital output
witch can switch the by-pass valve.
With this function during the check run of the pump(s)
a bypass valve is opened to avoid that the pump(s)
are running hot.
With open delay you can determine when the bypass
valve opens after the pump has started.
With close delay you can determine when the bypass
valve must close before the pump must stop.
Function PT 1000:
Extra parameters needed
Par. 3-14-4 Temperature in Celsius
Par. 3-14-5 Flush time in seconds
Par.3-14-6 Attempts in 24 h
Par. 3-8-2-1 / 3-8-2-6 Selection of the digital output
witch can switch the by-pass valve (flush valve)
With this function you can flush, for instance, a water
tank when the medium temperature over a certain
period is too high.
You can set the amount of attempts in 24 h when the
temperature stays too high within this 24 h an urgent
alarm will be raised.
Function Digital input:
Extra parameters needed
Par. 3-14-7 Minimum open time > in seconds
Par. 3-8-2-1 / 3-8-2-6 Selection of the digital output
witch can switch the by-pass valve
With this configuration of the digital input you can
switch an external bypass valve to create a minimal
flow for the pump. Also is needed a contact from an
external, for instance, flow switch.
When the pump is started also the by-pass valve is
opened when the flow is sufficient the contact of the
flow indicator switches off and the by-pass valve
closes.
When the flow is reduced below a minimum the
bypass valve opens again. If the pressure is above
set point first the bypass valve will close and then the
pump will stop.
Par. 3-4-1-4-10-6 Open band for a proportional valve
Function Level see par. 3-3-2 Inlet Level prop.
Par. 3-4-1-4-10-6 Open band in %
Par. 3-4-1-4-10-3 Hysteresis
Par. 3-4-1-4-10-1 Level set point 1
With this parameter you can give the proportional
valve a minimum open signal
When the level in a tank is descending the
proportional valve will start opening with this minimum
band.
When the level is descending further the proportional
valve will follow this signal to the value set in par. 3-4-
1-4-10-3
When the level is raising the proportional valve will
close till the value of the open band is reached.
Then proportional valve will be stopped (it remains
open with the set value in par. 3-4-1-4-10-6)
When the level in the tank reaches the value of par. 3-
4-1-4-10-1 the proportional valve will close
immediately.
Par 3-4-3-28 Torque characteristics
Only applicable for the Danfoss VLT 2800
9.9 Break-Unit Megacontrol
(Rainwater recovery)
It is possible to run three booster pumps and two
rainwater pumps (only one running at the time) with
the Control unit. Standard will be one or two booster
pumps (only one running at the time) and one
rainwater pump. The rainwater recovery unit is a
separate variant of the 3-3-2 parameter.
ATTENTION
See factory settings 3-2-2-1