Instruction manual

Cascade Controller Option
■ Programming of the Lead Pump Alter-
nation Function
The standard cascade controller parameters and the
following parameters 750 - 753 are to be programmed.
Select "Standard" in quick menu 020, par. 723
Operational mode select.
Parameter 722 Pump cycling (quick menu 032) now
includes Enabled - Indexed alternation, i.e.
• [0] Disabled (DISABLE)
• [1] Enabled - Standard mode (ENABLE)
• [2] Enabled - Indexed alternation (ENABLE
INDEXED) where you choose [2].
Parameter 712 Motor pump combinations (quick
menu 021) are now limited to:
Pump combination Relays used Comment
2 pumps @ 100% Relay 6, 7. PUMP#1 (at R6) and PUMP#2 (at R7).
3 pumps @ 100% Relay6,7,8. PUMP#1 (at R6), PUMP#2 (at R7) and
PUMP#3 (at R8).
4 pumps @ 100% Relay6,7,8,9. PUMP#1 (at R6), PUMP#2 (at R7),
PUMP#3 (at R8) and PUMP#4 (at R9).
And the following parameters are to be set:
Quick Menu 036 Par. 750 Alternation Time
(ALTERNATION TIME)
Value:
0-999
✭ 0 Hours
(0 = Only manual)
Function:
This is the time period between automatic alternation
of the lead pump, e.g. alternation every 48 hours.
When alternation occurs, all pumps shut down
and a new lead pump is connected.
Description of choice:
Set the desired value in hours. "0" corresponds
to manual operation.
Quick Menu 037 Par. 751 Elapsed
Alternation Time
(ELAPSED ALT TIME)
Value:
0-par. 750 Alternation time
✭ 0 Hours
Function:
The timer counts the elapsed time since last
alternation, and can be used during commissioning.
E.g. if the time when programming the adjustable
frequency drive is 9:30 (am) and you want the lead
pump alternation to take place at 23.00 (11 pm)
counting the hours back to 23.00 (11 pm) gives
you the elapsed hours, i.e. 10.5 hours
Lead pump alternation occurs when the "elapsed
alternation time" is equal to "alternation time".
Description of choice:
Set the desired time.
Quick Menu 038 Par. 752 Alternation Register
(ALT. REGISTER)
Value:
1-4
✭ 1
Function:
It is possible to manually choose the desired lead pump
for the next "alternation time " period. When selecting
a
number between 1 and 4 the elapsed alternation
timer will be reset. As soon as the chosen lead-pump
has been in operation for the alternation time set in
par. 750, automatic alternation will take over.
When manually changing lead pump, all pumps
will shut down like for automatic alternation before
a new lead pump is connected.
NOTE
Can only be changed when the system
is running.
MG.60.I5.22 - VLT is a registered Danfoss trademark
47
Standard Cascade
Controller Setup