Danfoss VLT HVAC Series User Manual

25-45 Staging Speed [Hz]
Range: Function:
0.0 Hz* [0.0 - 0.0 Hz] Readout of the below calculated value for Staging Speed. When adding a fixed speed pump, the
variable speed pump ramps down to a lower speed in order to prevent an overshoot of pressure.
When the variable speed pump reaches the “Staging Speed” the fixed speed pump is staged on.
Staging Speed calculation is based on par.25-42
Staging Threshold , and par.4-14 Motor Speed High
Limit [Hz]
.
Staging Speed is calculated with the following formula:
STAGE
=
HIGH
STAGE %
100
where n
HIGH
is Motor Speed High Limit and n
STAGE100%
is the value of
Staging Threshold.
25-46 De-staging Speed [RPM]
Range: Function:
0 RPM* [0 - 0 RPM] Readout of the below calculated value for De-staging Speed. When removing a fixed speed pump,
in order to prevent an undershoot of pressure, the variable speed pump ramps up to a higher speed.
When the variable speed pump reaches the “De-staging Speed” the fixed speed pump is de-staged.
De-staging Speed is calculated based on par.25-43
De-staging Threshold , and par.4-13 Motor Speed
High Limit [RPM]
.
De-staging Speed is calculated with the following formula:
DE−STAGE
=
HIGH
DE−STAGE %
100
where n
HIGH
is Motor Speed High Limit and n
DESTAGE100%
is the
value of De-staging Threshold.
25-47 De-staging Speed [Hz]
Range: Function:
0.0 Hz* [0.0 - 0.0 Hz] Readout of the below calculated value for De-staging Speed. When removing a fixed speed pump,
in order to prevent an undershoot of pressure, the variable speed pump ramps up to a higher speed.
When the variable speed pump reaches the “De-staging Speed” the fixed speed pump is de-staged.
De-staging Speed is calculated based on par.25-43
De-staging Threshold , and par.4-14 Motor Speed
High Limit [Hz]
.
De-staging Speed is calculated with the following formula:
DE−STAGE
=
HIGH
DE−STAGE %
100
where n
HIGH
is Motor Speed High Limit and n
DESTAGE100%
is the value of De-staging Threshold.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
3-244 MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT HVAC Series Specifications

General

Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Profibus, Ethernet
Cooling Method	Forced convection
Ambient Temperature	-10°C to +40°C
Enclosure Rating	IP20, IP21, IP55
Output Voltage	0 - 100% of supply voltage