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1
R73 @100% R74
@200%
2
R73 100% R74,75
200%
3
R73,74 100% R75
300%
4
R73,74 100 75,76
300
5
R73 @100%
6
R73, R74 @100%
7
R73-R75 @100%
8
R73-R76 @100%
9
R73-R77 @100%
10
R73-R78 @100%
11
2 PUMPS:R71-R74
100%
12
3 PUMPS:R71-R76
100%
13
4 PUMPS:R71-R78
100
The lead pump is always a 100% capacity pump
and is always part of the system. The lead pump is
not mentioned in the table, for the choices (# 1-10)
related to Fixed lead pump control.
Quick menu 19 Par. 702 Staging bandwidth %
Par. 702 Staging bandwidth %
(STAGING BANDW%)
Value:
1 - 100% (100% = Off)
Function:
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 Staging bandwidth (SBW)
is programmed as a percentage of the setpoint
(desired pressure). For example, if the setpoint is 5
bar and the SBW set at 10%, a system pressure
MG.70.A1.02 - VLT is a registered Danfoss trademark
100% Capacity
1 pump controlled by
relay R73
1 pump controlled by
relay R73
2 pumps controlled by
relay R73, R74
2 pumps controlled by
relay R73, R74
1 pump controlled by
relay R73
2 pumps controlled by
relay R73, R74
3 pumps controlled by
relay R73, R74, R75
4 pumps controlled by
relay R73, R74, R75,
R76
5 pumps controlled by
relay R73, R74, R75,
R76, R77
6 pumps controlled by
relay R73, R74, R75,
R76, R77, R78
2 pumps controlled by
relay R71, R72, R73,
R74
3 pumps controlled by
relay R71, R72, R73,
R74, R75, R76
4 pumps controlled by
relay R71, R72, R73,
R74, R75, R76, R77,
R78
5%
VLT® 7000 Booster
200% Capacity
1 pump controlled by relay
R74
2 pumps controlled by
relay R74, R75
between 4.5 and 5.5 bar is tolerated. No staging or
destaging will occur within this bandwidth.
Description of choice:
Set the staging bandwidth percentage to
accommodate system pressure fluctuation.
300%Capacity
1 pump controlled by
relay R75
2 pump controlled by
relay R75, R76
99
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