21
VARIABLE FREQUENCY DRIVE SPEED CONTROL OPTION SETUP
Pump Down Application - Example
Notes:
1. A drawing should be made similar to the one above in order to coordinate the Pump Call On and Off Levels with
the Speed Versus Level Curve.
2. For each application there is usually a Minimum Speed, below which pump operation is undesirable.
3. The VFD Minimum Speed may be set on either the Pump Controller using Parameter P.20 or on the VFD, but not
on both.
4. For cases where some pumps are operated on a VFD, and others are operated at full speed, care should be taken
to setup the system so that the speed of the pumps on VFDs is not allowed to go unacceptably low while being run
with the other pumps at full speed.
5. Care should be taken not to set the Level At 100% Speed parameter and the Level At Minimum Speed Parameters
too close together. The Fault Indicator on the front of the controller will be turned on if these two Parameters are
set too close together, or are accidentally switched around. See Fault Codes 11 and 12 on the Fault Code Table.
6. Pump Start Speed Boost Time - This feature causes the Speed Reference of all pumps to temporarily increase to
100% when a pump is called, and each time an additional pump is called. The pump speed stays at 100%, for the
time set on the Parameter P.23. The pump speed then returns to normal. This feature may be used in cases
where a pump is started at a speed that is significantly less than 100%, to ensure that the Check Valve opens.
Parameter
Default
Value
Current
Value Setting Definitions
P.20
50%
Minimum Speed (Percent of Full Speed)
Range: 0% - 95%
P.21
3.5 feet Level at Minimum Speed Range: 0.1 - 99.9 feet
P.22
6.0 feet Level at 100% Speed Range: 0.1 - 99.9 feet
P.23
0 sec.
Pump Start Speed Boost Time Range: 0 - 60 seconds
Note: Set for 0 seconds to Disable Feature. See Note 6 below.
P.48
100%
Speed of Pump Under Remote Control Range: 0% - 100%
SCADA Register 40046
VFD SPEED CONTROL - Setup Parameters
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