Vacon 100 hvac Applications Manual page 181

PARAMETER DESCRIPTIONS
Selection
Selection name
number
0
1
To adjust the intervals of the autochange, use P3.14.5 Autochange Interval. You can set the
maximum number of motors that can operate with parameter Autochange: Motor Limit
(P3.14.7). You can also set the maximum frequency of the regulating motor (Autochange:
Frequency Limit P3.14.6).
When the process is in the limits that are set with parameters P3.14.6 and P3.14.7, the
autochange occurs. If process is not in these limits, the system will wait until the process is
in the limits, and do the autochange after that. This prevents sudden pressure drops during
the autochange when a high capacity at a pump station is necessary.
EXAMPLE
After an autochange, the first motor is put last. The other motors move up 1 position.
The start sequence of the motors: 1, 2, 3, 4, 5
--> Autochange -->
The start sequence of the motors: 2, 3, 4, 5, 1
--> Autochange -->
The start sequence of the motors: 3, 4, 5, 1, 2
P3.14.5 AUTOCHANGE INTERVAL (ID 1029)
Use this parameter to adjust the autochange intervals.
This parameter defines how often to rotate the starting order of the motors/pumps. The
autochange is done when the number of running motors is below the autochange motor limit
and the frequency is below the autochange freq limit.
When the autochange interval has elapsed, the autochange occurs if the capacity is below the
level set with P3.14.6. and P3.14.7.
P3.14.6 AUTOCHANGE: FREQUENCY LIMIT (ID 1031)
Use this parameter to set the autochange frequency limit.
An autochange is done when the autochange interval has elapsed, the number of running
motors is less than autochange motor limit and the controlling drive is running below
autochange frequency limit.
P3.14.7 AUTOCHANGE: MOTOR LIMIT (ID 1030)
Use this parameter to set the amount of pumps used in Multi-pump function.
24-HOUR SUPPORT +358 (0)201 212 575 · EMAIL: VACON@VACON.COM
In normal operation, the sequence of the motors is always 1,
2, 3, 4, 5. The sequence can change during the operation if
Disabled
you add or remove interlocks. After the drive stops, the
sequence always changes back.
The system changes the sequence at intervals to wear the
Enabled motors equally. You can adjust the intervals of the autoch-
ange.
VACON · 181
Description
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