PS200 Configuration & Operation Guide
SINGLE PUMP PROCESS
Page 14
Example – if full load rpm = 3550, set min speed to
355. Use greater than 10% if either of the following
conditions exist:
x
Pump Minimum Speed - Some pumps have
minimum speed requirements, such as multistage
pumps (>2 stages) and sleeve bearing pumps.
Consult your pump operation manual to see if there
is a minimum speed limit for your pump.
Note - 1&
2 stage pumps do not normally have minimum
speed requirements.
x
Static Head Conditions (minimum flow) - The
minimum speed should be set to assure that the
pump generates enough head to overcome static
resistance. In some cases, this can cause overheating
and possible vaporization of the liquid in the pump
casing.
14.02 MINIMUM SPEED
KEY SEQUENCE
[From parameter group: 14.01 MAXIMUM
SPEED]
OR
Scroll to parameter 14.02
MINIMUM SPEED
ENTER
Press to enter the
parameter setting mode
OR
OR
Use a combination of the
arrow keys to scroll to the
minimum speed.
Enter the minimum
speed that the pump
and motor can safely
operate at.
Consider-
x
Turndown ratio
x
Pump minimum
speed
x
Minimum flow
The default value is 25%
of the speed set in
parameter 11.07 MOTOR
FL RPM
ENTER
Press to complete the
entry
NOTES
The default settings of the PumpSmart drive will stop the
pump if the process demand requires the pump to operate
below the minimum speed. A LOW DEMAND Fault will be
displayed in this case. A delay can be set for up to 30
minutes (1800 sec) before shutting down. Alternatively the
drive may be set to operate at a minimum speed until it is
manually shut-off. If the process condition clears while
operating at minimum speed, PumpSmart will resume normal
operation. See the OPTIONS section for further details.
If PumpSmart shuts-down due to a pump protect fault, it can
be configured to try and restart multiple times before
shutting down completely. The interval between these times
can be adjusted for up to 250 seconds. The default value is
60 seconds. The AUTO RESTART and ERROR RESET features
must be set to "ON" See the OPTIONS section for further
details.
Once the PumpSmart unit shuts down completely, it must be
manually restarted.
ACT
PAR
FUNC
DRIVE
ENTER
1 L
Æ
0 P S I G 0
1 4 S P D L I M / S T R T L V L
2 M I N I M U M S P E E D
443
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