Danfoss MCO 101 Manual page 33

Extended and Advanced Cascade Controller
Option
27-16 Runtime Balancing
Option:
[0] * Balanced Priority 1
[1] Balanced Priority 2
[2] Spare Pump
27-17 Motor Starters
Option:
None (contactors)
Soft starters
Star-delta starters
27-18 Spin Time for Unused Pumps
Range:
1.0 s* [0.0 s - 99.0 s]
27-19 Reset Current Runtime Hours
Option:
[0] * Do not reset
[1] Reset
Function:
Runtime Balancing sets the priority of each pump for balancing it's running hours. The pumps with
the highest priority will be operated before the lower prioritized pumps. If all pumps are set as spare
pumps, they will be staged and de-staged as no priority is set. This means staged in the order of
1-2-3 and de-staged in the order of 3-2-1.
Possible selections are:
Turned on first, turned off last.
Turned on if no priority 1 pumps are available. Turned off before priority 1 pumps are turned off.
Turned on last, turned off first.
Function:
Motor Starters selects the type of line power starters used on the fixed-speed pumps. All of the fixed
speed pumps must be configured the same. Possible choices are:
Function:
Spin Time for Unused Pumps sets the length of time to spin unused pumps. If a fixed speed pump
has not been run in the last 72 hours, it will be turned on for this time. This is to prevent damage
caused by leaving the pump off too long. The spin feature may be disabled by setting the value of
this parameter to 0. Warning - Setting this parameter too high may create excess pressure in some
systems.
Function:
Reset Current Runtime Hours is used to reset all of the Current Runtime Hours to zero. This time is
used for runtime balancing.
®
MI.38.C2.22 - VLT is a registered Danfoss trademark
6 How to Program
6
6-3