Amtech Axpert-Eazy AMT-011-4, Instruction Manual

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Axpert-Eazy AC Variable Frequency Drive
6-107
6
ULT: PID Deviation Upper Limit (
C608 ).
LLT: PID Deviation Lower Limit ( C609 ).
T
1:
Pump start hold time ( H102 )
T
2:
Pump stop hold time ( H103 )
T
3:
Pump Continuous ON time limit ( H104 )
T
4:
Pump Changeover time ( H105 )
The ON/OFF control of multiple pumps is carried out so that the operation time of each pump is equal.
1) When the PID output reaches ULT and T
1
is passed, the auxiliary Pump-2 with the shortest
operation time turns ON.
2) When the PID output reaches ULT and T
2
is passed, the auxiliary Pump-1 with the shortest
operation time turns OFF.
3) Following (2), when the PID output matches LLT for the time of T
2
, the auxiliary Pump-3 with the
longest operation time turns OFF.
4) When the time that the PID output and LLT match does not reach T
2
, the pump OFF control will
not be carried out.
Pump changeover function using Pump Continuous ON time limit (H104).
5) When the time that the auxiliary pump's ON/OFF control is not carried out reaches T
3
, the
Pump-4 with the longest operation time within all of the auxiliary pumps turns OFF, and the
Pump-1 with the shortest operation time will turn ON after T
4
. If H104 is set to 0, changeover
following the continuous operation limit is prohibited.
The variable speed control pump will not change even if the continuous operation limit time is
exceeded.
When the inverter is stopped due to the stop command or fault, the pump status will not change and it
will remain as it is. To turn off the entire operating pumps, disable the multi-pump operation.
When the inverter’s power is turned off, the operation time history for each pump will be lost.
H101: No of Pump Selection
Select the number of pumps to be controlled. Set to zero to disable the multi-pump function.
H102: Pump Start Hold Time (Sec)
If the PID output reaches to upper limit and remains there for more than the set time, the next pump
will be switched ON.
H103: Pump Stop Hold Time (Sec)
If the PID output reaches to lower limit and remains there for more than the set time, the next pump
will be switched OFF.
H104: Pump Continuous ON Time Limit (Hrs)
If pump’s ON/OFF control is not carried out for more than the set time, the pump will change to the
longest operating pump to the shortest operating pump.
H105: Pump Changeover Time (Sec)
Set the time for changing from the pump that has been operating longest to the pump operating
shortest.