Baldor MN735 manual Power Dependent Parameters Inverter Size Factory Setting, Current

The gains should be set–up so that a critically damped response is achieved for a step change in setpoint. An underdamped or oscillatory system can be thought of as having too much gain, and an overdamped system has too little.

To set up the P gain, set the I gain to zero. Apply a step change in setpoint that is typical for the System, and observe the response. Increase the gain and repeat the test until the system becomes oscillatory. At this point, reduce the P gain until the oscillations disappear. This is the maximum value of P gain achievable.

If a steady state error is present, i.e. the feedback never reaches the setpoint value, the I gain needs to be increased. As before, increase the I gain and apply the step change. Monitor the output. If the output becomes oscillatory, reduce the P gain slightly. This should reduce the steady state error. Increasing the I gain further may reduce the time to achieve zero steady state error.

These values of P and I can now be adjusted to provide the exact response required for this step change.

Product Related Parameter Values

Frequency Dependent Parameters

	50Hz default	60Hz default
MAX SPEED	50	60

BASE FREQUENCY

50

60

Power Dependent Parameters

	Inverter Size		Factory
			Setting
MOTOR	Size 1 : 0.25kw 230V		1.5A
CURRENT	Size 1 : 0.37kw 230V		2.2A
	Size 1 : 0.55kw 230V		3.0A
	Size 1 : 0.75kw 230V		4.0A
	Size 2 : 1.1kw 230V		5.5A
	Size 2 : 1.5kw 230V		7.0A
	Size 2 : 1.5kw 460V		1.5A
	Size 2 : 2.0kw 460V		2.0A
	Size 2 : 2.5kw 460V		2.5A
	Size 2 : 3.5kw 460V		3.5A
	Size 2 : 4.5kw 460V		4.5A
	Size 2 : 5.5kw 460V		5.5A
	Size 3	: 6.8kw 460V	6.8A
	Size 3	: 9.0kw 460V	9.0A
	Size 3	: 12.0kw 460V	12.0A
	Size 3	: 16.0kw 460V	16.0A

MN735 Start–Up and Operation 4–13