Westinghouse MA7200 Plus quick start manual Setting Minimum Speed in Pump Applications

MA7200 PLUS Inverter 1 to 2 HP PID Fan and Pump Quick Start Manual

__________________________________________________________________

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%

(Minimum pump speed )

Keypad Steps					Resulting Display
1 - Press the		PRGM		key		An – 01 -
		DRIVE				Freq. Cmd. 1
2 - Press the		DSPL		key 3 times		Cn-01
						Input Voltage
3 - Press the			key until the display shows			Cn-19
						Freq Cmd Low Bound
4 - Press the				key		Flashing
	ENTER					Cn-19 = 000%
	EDIT

Freq Cmd Low Bound

Flashing

5 - Press the

6 - Press the

RESET

EDIT

ENTER

key twice; then the	key 5 times	Cn-19 = 050%
		Freq Cmd Low Bound
key to save.		Entry Accepted

2Seconds

Flashing

Cn-19 = 050%

	PRGM	Freq Cmd Low Bound
7 - Press the		key to return to the main display.
	DRIVE

________________________________________________________________ 8

TECO – Westinghouse Motor Company