Danfoss vlt aqua Programming Guide

25-20 Staging Bandwidth [%]
Range: Function:
10%
*
[1 - 100 %] Set the staging bandwidth (SBW) percentage to accommodate
normal system pressure fluctuation. In cascade control systems,
to avoid frequent switching of fixed speed pumps, the desired
system pressure is typically kept within a bandwidth rather than
at a constant level.
The SBW is programmed as a percentage of par. 3-02 Minimum
Reference and par. 3-03 Maximum Reference. For example, if
the set-point is 5 bar and the SBW is set to 10%, a system
pressure between 4.5 and 5.5 bar is tolerated. No staging or de-
staging will occur within this bandwidth.
25-21 Override Bandwidth [%]
Range: Function:
100% =
Disa-
bled
*
[1 – 100%] When a large and quick change in the system demand occurs
(such as a sudden water demand), the system pressure rapidly
changes and an immediate staging or destaging of a fixed speed
pump becomes necessary to match the requirement. The over-
ride bandwidth (OBW) is programmed to override the staging/
destaging timer (par. 25-23/25-24) for immediate response.
The OBW must always be programmed to a higher value than
the value set in
Staging Bandwidth (SBW), par. 25-20. The OBW
is a percentage of par.3-02 Minimum Reference and par. 3-03
Maximum Reference..
2. Parameter Description VLT
®
AQUA Drive Programming Guide
230 MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
2

Danfoss vlt aqua Specifications

General

Supply Voltage	200-240V, 380-500V, 525-600V
Enclosure	IP20
Features	Energy optimization
Approvals	CE, UL, cUL
Input Voltage Range	200-240V, 380-500V, 525-600V
Output Voltage Range	0 to supply voltage
Protection Features	Overvoltage, Undervoltage, Overcurrent, Short circuit, Ground fault
Communication Interfaces	PROFIBUS
Cooling Method	Air-cooled