Delta VFD-E

Chapter 4 Parameters|
Revision Jan. 2009, 06EE, SW--PW V1.12/CTL V2.12 4-63
1kHz
8kHz
15kHz
Carrier
Frequency
Acoustic
Noise
Electromagnetic
Noise or leakage
current
Heat
Dissipation
Current
Wave
Significant
Minimal
Significant
Minimal
Minimal
Significant
Minimal
Significant
 From the table, we see that the PWM carrier frequency has a significant influence on the
electromagnetic noise, AC motor drive heat dissipation, and motor acoustic noise.
 The PWM carrier frequency will be decreased automatically by heat sink temperature and
output current of the AC motor drive. It is used as a necessary precaution to prevent the AC
motor drive from overheating and thus extends IGBT’s life. If the user wants to fix carrier within
the rated range and won’t change by the change of the surrounding temperature and
frequently load. Please refer to Pr.02.18 for Selection of Carrier Modulation.
 Related parameters: Pr.02.18(Selection of Carrier Modulation) and Pr.03.08(Fan Control).
02.04 Motor Direction Control
Factory Setting: 0
Settings 0 Forward/Reverse operation enabled
1 Reverse operation disabled
2 Forward operation disabled
 This parameter is used to disable one direction of rotation of the AC motor drive direction of
rotation to prevent damage due to operation errors.
 The motor direction also can be limited by setting one of Pr.04.05~04.08 to 21.
 Related parameters: Pr.04.05(Multi-function Input Terminal (MI3)), Pr.04.06(Multi-function
Input Terminal (MI4)), Pr. 04.07(Multi-function Input Terminal (MI5)) and Pr.04.08(Multi-
function Input Terminal (MI6))
02.05 Line Start Lockout
Factory Setting: 1
Settings 0 Disable. Operation status is not changed even if operation
command source Pr.02.01 is changed.
1 Enable. Operation status is not changed even if operation command
source Pr.02.01 is changed.
2 Disable. Operation status will change if operation command source
Pr.02.01 is changed.
3 Enable. Operation status will change if operation command source
Pr.02.01 is changed.