Delta Electronics VFD-G manual PWM Carrier Frequency Selections, Settings, 7.5~10HP 4000~6000Hz

Chapter 4 Parameters

Coast: The AC drive output instantly stops upon command and the motor free spins until it comes to a complete stop.

External Fault may be enabled by the EF terminal or a Multi-Function terminal. Please refer to Pr.04-00 to 04-03.

Output		Frequency							Frequency
							Output
Frequency
Motor							Frequency
								Motor
speed
								Speed
						Time				Time
Operation				Stops according				Operation		Free running
				to deceleration					RUN	to stop
Command RUN				time	STOP			Command		STOP
			Ramp							Coast
02 - 03		PWM Carrier Frequency Selections
	Settings		7.5~10HP: 4000~6000Hz							Factory Setting: 6000
			15~30HP: 3000~6000Hz							Factory Setting: 6000
			40~125HP: 2000~6000Hz							Factory Setting: 4000
			150~300HP: 2000~4000Hz							Factory Setting: 4000

This parameter sets the carrier frequency of PWM output. The factory setting and setting range depend on the model type.

When the temperature of the heat sink is greater than its limit, the AC drive will automatic lower the carrier frequency to avoid over heating the AC drive.

The Carrier frequency of the PWM output has a signification influence on the electromagnetic noise, heat dissipation of the AC drive, and the acoustic noise to the motor as shown in the following chart.

Carrier	Acoustic	Electromagnetic	Leakage	Heat
Frequency	Noise	Noise	Current	Dissipation
Signification	Minimal	Signification	Signification	Signification
Minimal	Signification	Minimal	Minimal	Minimal

When the carrier frequency is low, current ripple of the AC drive is large. This may result in a current display value greater than the actual value.

Revision July 2008, EG03, SW V1.06 4-33