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4.6 Configuration and function
1
2
3
4
5
6
1
2
3
4
5
6
Fig. 2:
Configuration Hydro-Unit Premium Line VC / SVP
1
Control box
4
Membrane-type accumulator
2
Control unit
5
Manifold
3
Pump
6
Baseplate
Description
Fully automatic pressure booster system with two, three or four vertical high-pressure
pumps (3) for ensuring the required supply pressure.
Function
Hydro-Unit Premium Line F:
Either two, three or four pumps are controlled and monitored by a microprocessor control
unit (DP Control). The first pump is started up when the pressure falls below the set start-up
pressure (setpoint minus half bandwidth). Additional pumps are sequenced in automatically
in line with actual demand. When demand decreases, the pumps are sequenced out again
as the stop pressure (setpoint plus half bandwidth) is reached. The pump that has been
started up first will be stopped first. The pumps are automatically started up in a different
order for each new cycle. The actual pressure is measured by an analog pressure
transmitter. The function of this pressure transmitter is monitored (broken wire detection).
This ensures equal distribution of pump operating hours.
If a duty pump fails, the next pump is started up immediately. A general fault message can
be transmitted via a volt-free contact (e.g. to the control station).
Hydro-Unit Premium Line VC, SVP:
Either two, three (VC) or four (SVP) pumps are controlled and monitored by a
microprocessor control unit (DP Control). Each pump is operated on a frequency inverter
and controlled by the control unit so as to ensure a constant discharge pressure of the
pressure booster system.
As the demand increases or decreases, peak load pumps are started and stopped
automatically. As soon as the demand increases again after one pump has been stopped,
another pump which has not been in operation before is started up. When the last pump has
been stopped and the demand increases again, the next pump in line is started up on a
frequency inverter. The stand-by pump is also included in the alternating cycle.
The standard setting is for the pressure booster system to start automatically as a function
of pressure. As long as the pressure booster system is in operation, the pumps are started
and stopped as a function of demand (standard setting). In this way it is ensured that the
