Danfoss Cascade Operating Instructions Manual page 44

NB!:
Sleep mode activates when the adjustable
speed pump is the only pump running. To
turn off the destage timer, turn off sleep
mode first. Set parameter 403, Sleep Mode to
301 seconds (off), then parameter 721, De-stage
Timer to 301 seconds (off).
Quick Menu 031 Par. 722 Pump cycling
(PUMPCYCLING)
Value:
Enabled - Disabled
Function:
To achieve equal hours of operation in the constant
speed pumps, pump use can be cycled. Timers
on the relay outputs (relays 6, 7, 8, and 9) monitor
the running hours of each pump. In staging on, the
relay (pump) with the least hours is switched on.
In destaging, the relay (pump) with the most hours
is switched off. Not operating a pump over long
time periods can create corrosion concerns.
If cycling is disabled, the controller follows the
fixed pattern of relay activation (6, 7, 8 and
9) regardless of the running hour counters.
Destaging is in the reverse order.
Description of choice:
Choose whether to disable or enable the function.
Quick Menu 035 Par. 420 PID normal/inverse
control
(PID NOR/INV. CTRL)
Value:
Normal (NORMAL)
Inverse (INVERSE)
Function:
This determines how the drives PID controller
responds to a difference between the setpoint and
feedback. Normal is when the drive is to reduce the
output frequency as the feedback signal increases.
Inverse is when the drive is to increase the output
frequency as the feedback signal increases.
Description of choice:
Select the PID controller response option.
44
Cascade Controller Option
Enabled
[0]
[1]
MG.60.I3.02 - VLT is a registered Danfoss trademark