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MA7200 PLUS Inverter 1 to 2 HP PID Fan and Pump Quick Start Manual
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Step 7
– Setting Minimum Speed in Pump Applications
(NOTE: In the case of a fan application skip this step and go to Step 8)
•
In the case of pump applications it is normally required to limit the minimum speed that the
pump will operate regardless of the input speed command. The pump minimum speed is
usually specified either by the pump manufacturer or the application. Once this value has
been established, the minimum output frequency of the inverter and thus the minimum
motor (pump) speed can be set by parameter Cn-19. This parameter sets the minimum
inverter frequency output, and thus a minimum motor (pump) speed to a percentage of the
maximum output command frequency.
•
The following is an example of setting the minimum motor (pump) speed to 1800 RPM,
which is 50% of the maximum pump speed, 3600 RPM.
To set parameter Cn-19 = 050%
Keypad Steps
1 - Press the
2 - Press the
3 - Press the
4 - Press the
ENTER
5 - Press the
6 - Press the
ENTER
7 - Press the
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(Minimum pump speed )
PRGM
key
DRIVE
key 3 times
DSPL
key until the display shows
EDIT
key
key twice; then the
RESET
EDIT
key to save.
PRGM
key to return to the main display.
DRIVE
Resulting Display
An – 01 -
Freq. Cmd. 1
Cn-01
Input Voltage
Cn-19
Freq Cmd Low Bound
Cn-19 = 000%
Freq Cmd Low Bound
Cn-19 = 050%
key 5 times
Freq Cmd Low Bound
Entry Accepted
Cn-19 = 050%
Freq Cmd Low Bound
TECO – Westinghouse Motor Company
Flashing
Flashing
2 Seconds
Flashing
8
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