Danfoss VLT Aqua Drive FC 202 Programming Manual page 553

Programming Guide | VLT® Aqua Drive FC 202
Speed Destaging
Lead pump
(controlled by drive)
t 2
P PC-41
Lead pump starts
to ramp up
Cascade Controller
prepares for
removing pump
Figure 122: Destaging with Ramp-up Delay
25-42 Staging Threshold
Default value: Size related
Setup:
All setups
Data type: Uint8
When adding a fixed-speed pump to prevent an overshoot of pressure, the variable-speed pump ramps down to a lower speed. When
the variable-speed pump reaches the staging speed, the fixed-speed pump is staged on. The staging threshold is used to calculate the
speed of the variable-speed pump when the "cut-in point" of the fixed-speed pump occurs. The calculation of the staging threshold
is the ratio of parameter 4-11 Motor Speed Low Limit [RPM] or parameter 4-12 Motor Speed Low Limit [Hz], to parameter 4-13 Motor
Speed High Limit [RPM] or parameter 4-14 Motor Speed High Limit [Hz], expressed in percent. Staging threshold must range from
to 100%, where n
If the setpoint is reached after staging before the variable speed pump reaches its minimum speed, the system enters the state
closed loop when the feedback pressure is crossing the setpoint.
25-43 Destaging Threshold
Default value: Size related
Setup: All setups
Data type:
Uint8
When removing a fixed-speed pump to prevent an undershoot of pressure, the variable-speed pump ramps up to a higher speed. When
the variable-speed pump reaches the destaging speed, the fixed-speed pump is destaged. The destaging threshold is used to calculate
the speed of the variable-speed pump when the destaging of the fixed-speed pump occurs. The calculation of the destaging threshold
© 2024.06
Fixed-speed pump
(controlled by soft starter)
Time
is motor speed high limit.
HIGH
Parameter type:
Conversion index:
Change during operation:
NOTICE
Parameter type:
Conversion index:
Change during operation:
Parameter Descriptions
Range, 0 - 100%
0
True
Range, 0 - 100%
0
True
AU361182657213en-002101 / 130R0338 | 553