Danfoss vlt aqua - Page 234

2.21.4. 25-4* Staging Settings
Parameters determining conditions for staging/destaging the pumps.
25-40 Ramp Down Delay
Range: Function:
10 sec.
*
[0 – 120 sec. ] When adding a fixed speed pump controlled by a soft starter, it
is possible to delay the ramp down of the lead pump until a
preset time after the start of the fixed speed pump to eliminate
pressure surges or water hammer in the system.
Only to be used if
Soft Starter [1] is selected in par. 25-02, Motor
Start
.
25-41 Ramp Up Delay
Range: Function:
2 sec.
*
[0 – 120 sec.] When removing a fixed speed pump controlled by a soft starter,
it is possible to delay the ramp up of the lead pump until a preset
time after the stopping of the fixed speed pump to eliminate
pressure surges or water hammer in the system.
Only to be used if
Soft Starter [1] is selected in par. 25-02, Motor
Start
.
2. Parameter Description VLT
®
AQUA Drive Programming Guide
234 MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
2