Emerson Process Management 3-9000-745 manual Setting PWM Output

MON20/20 Software for Gas Chromatographs	User Manual
SEPTEMBER 2010	3-9000-745

5.	The appropriate rows under the PID Gain, PID Integral, and PID
	Derivative columns can also be edited by double-clicking and entering
	a new value. The value ranges for each column is as follows:
		PID Gain	0	- 500
		PID Integral	0	- 500
		PID Derivative	0	- 50000
6.	To save the changes and leave the window open so that you can
	monitor the heaters’ status, click Save. The current temperature of
	each heater displays in the Temperature column, and is updated in
	real time.
7.	To save the changes and close the window, click OK.

3.1.6 Setting PWM Output

Note

Pulse-Width Modulation (PWM) is a technique for providing intermediate amounts of electrical power between fully on and fully off.

A heater needs voltage to operate. The amount of voltage that is delivered to a heater can be controlled manually when the heater is set to Fixed On mode. Setting a heater to Fixed On mode can be useful when troubleshooting heater issues.

CAUTION

Fixed On mode is not recommended for general GC operations. Switching a heater to Fixed On mode removes its ability to maintain a constant temperature because the power delivered to the heater will not fluctuate based on the temperature setpoint, but will instead remain at the level set by the user.

To set a heater’s PWM Output, do the following:

1.Select Heaters... from the Hardware menu. The Heaters window displays.

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