Vacon 100 flow Applications Manual page 336

VACON · 336
P3.15.13 BANDWIDTH (ID 1097)
Use this parameter to set the bandwith area around the PID setpoint for starting and
stopping of the auxiliary motors.
When the PID feedback value stays in the bandwith area, the auxiliary motors do not start or
stop. The value of this parameter is given as a percentage of the setpoint.
P3.15.14 BANDWIDTH DELAY (ID 1098)
Use this parameter to set the duration before the auxiliary motors start or stop.
When the PID feedback is not in the bandwidth area, the time that is set with this parameter
must go before the auxiliary motors start or stop. The number of pumps that operate
increases or decreases, if the PID controller cannot keep the process value (feedback) in the
specified bandwidth around the setpoint.
The bandwidth area is specified as a percentage of the PID setpoint. When the PID feedback
value stays in the bandwidth area, it is not necessary to increase or decrease the number of
pumps that operate.
When the feedback value goes out of the bandwidth area, the quantity of time specified by
parameter P3.15.14 must go before the number of pumps that operate increases or
decreases. More pumps must be available.
1
2
Fig. 100: The start or stop of the auxiliary pumps (P3.15.13 = Bandwidth, P3.15.14 = Bandwidth
delay)
A. The pump that controls the system
operates at a frequency that is near the
maximum (-2Hz). This increases the
number of pumps that operate.
B. The pump that controls the system
operates at a frequency that is near the
minimum (+2Hz). This decreases the
number of pumps that operate.
10
P3.15.14
P3.15.13
A
LOCAL CONTACTS: HTTP://DRIVES.DANFOSS.COM/DANFOSS-DRIVES/LOCAL-CONTACTS/
P3.15.14
D
C
C. The number pumps that operate
increases or decreases, if the PID
controller cannot keep the process value
feedback in the specified bandwidth
around the setpoint.
D. The specified bandwidth around the
setpoint.
PARAMETER DESCRIPTIONS
B