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Delta Electronics AC Motor Drive VFD-E User Manual

Page 158

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Chapter 4 Parameters|

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11

4-105

Output frequency

(H)

Output voltage(V)

08.08 Current Limit

for Speed SearchSpeed

FWD Run

Time

B.B.

Fig 1:B.B. Speed Search with Last Output Frequency Downward Timing Chart

(Speed Search Current Attains Speed Search Level)

A

Input B.B. signal

Stop output voltage

Disable B.B. signal

Waiting time 08.07

Speed Search

Synchronization speed detection

Time

B.B.

Fig 2: B.B. Speed Search with Last Output Frequency Downward Timing Chart

(Speed Search Current doesn't Attain Speed Search Level)

A

Input B.B. signal

Stop output voltage

Disable B.B. signal

Waiting time 08.07

Speed Search

Synchronization speed detection

Output frequency
(H)

08.08 Current Limit
for Speed SearchSpeed

FWD Run

Time

B.B.

Fig3: B.B. Speed Search with Minimum Output Frequency Upward Timing Chart

A

Input B.B. signal

Stop output voltage

Disable B.B. signal

Waiting time 08.07

Restart

Synchronization speed detection

Keep accelerating

A

Output frequency

(H)

06.01
Over current
stall prevention

during acceleration

FWD Run