Delta Electronics VFD-M Pr.73, Present Fault Record, Pr.74, Pr.75, Third Most Recent Fault Record

Chapter 4 Parameters

Carrier Frequency	Acoustic Noise	Electromagnetic Noise,	Heat Dissipation
		Leakage Current
1KHz	Significant	Minimal	Minimal
15KHz	Minimal	Significant	Significant

From the above table, we see that the carrier frequency of PWM output has a significant influence on the electromagnetic noise, heat dissipation of the AC drive, and the acoustic noise to the motor.

Pr.72 Auto Restart Attempts After Fault
Settings 00 to 10	Factory Setting: 00

When this parameter is enabled (set different to zero), the AC Drive will restart/reset automatically up to 10 times after the occurrence of certain type of faults (over-current OC, over-voltage OV). If enabled, the AC drive will restart on “speed search”, which begins at Master Frequency. Setting this parameter to 0 will disable this operation. To set the fault recovery time after a fault, please see base-block time for speed search (Pr.34).

Pr.73	Present Fault Record
Pr.74	Second Most Recent Fault Record
Pr.75	Third Most Recent Fault Record

Factory Setting: 00

Settings 00 (no fault occurred )

01Over-current (oc)

02Over-voltage (ov)

03Overheat (oH)

04Overload (oL)

05Overload 1 (oL1)

06External Fault (EF)

07CPU failure 1 (CF1)

08CPU failure 3 (CF3)

09Hardware Protection Failure (HPF)

10Over-current during acceleration (OCA)

11Over-current during deceleration (OCd)

12Over-current during steady state operation (OCn)

4-52 Revision May 2008, ME14, SW V3.04