Danfoss Cascade Operating Instructions Manual page 47

Step 1: Master drive programming
The following drive parameters are used in
programming the Master drive. Note that while
the menu items are in sequence, not each menu
item in the Quick Menu is programmed.
Quick Menu 021 Par. 712 Motor Pump
Combinations
(PUMP COMBINATION)
Value:
R6 @100%
R6, R7 @100%
R6-R8 @100%
R6-R9 @100%
Function:
The number of slave pumps or fans is selected
in this parameter. In Master/Slave operation,
all motors are the same size.
R6 @100% = one slave controlled by relay 6.
R6, R7 @100% = two slaves controlled
by relays 6 and 7.
R6-R8 @100% = three slaves controlled by
relays 6, 7, and 8.
R6-R9 @100% = four slaves controlled by
relays 6, 7, 8, and 9.
Description of choice:
Select the number of slave pumps or fans.
Quick Menu 023 Par. 714 SBW staging off time
(DESTAGING DELAY)
Value:
0 - 3000 sec.
Function:
Destaging delay time is used to prevent the fast
cycling off of the slave pumps or fans. Increase the
time if frequent switching is encountered.
Description of choice:
Set staging off delay time. In Master/Slave operation,
3 seconds is a typical value.
MG.60.I3.02 - VLT is a registered Danfoss trademark
Cascade Controller Option
Quick Menu 024 Par. 715 SBW staging on time
(STAGING DELAY)
Value:
0 - 3000 sec.
Function:
Staging delay time is used to prevent the fast cycling
on of the slave pumps or fans. Increase the time
if frequent switching is encountered.
Description of choice:
R6 @100%
Set staging on delay time. In Master/Slave operation,
3 seconds is a typical value.
Quick Menu 028 Par. 418 Setpoint 1
(SETPOINT 1)
Value:
Feedback Min. to Feedback Max.
Function:
The default feedback process is used when a
pressure feedback signal is measured at the outlet
of the pumps. The cascade controller uses the
feedback to estimate the setpoint required at various
rates of flow. Setpoint 1 is the minimum pressure
required when the system is running with only the
adjustable frequency drive operating at full speed.
Setpoint 1 is a theoretical value that the cascade
controller uses as an internal reference to calculate
pressure loss in the system under minimum load.
The controller adjusts the internal reference based
upon the number of pumps in operation.
30 sec.
The range is determined by Quick Menu item 14
(parameter 413, Minimum Feedback) and Quick Menu
item 15 (parameter 414, Maximum Feedback). When
the pressure feedback signal originates at the far end
of the system, the drive does not need to compensate
for system pressure changes due to flow. For this
system configuration, or for two setpoint PID control,
see Alternative Programming at the end of this chapter.
30 sec.
0.000
47