Delta Electronics VFD-L Series Spezifikationen PDF herunterladen (Seite 37)

VFD-M Series

5-11

Pr.31

Start-Point for DC Braking Factory Setting: 0.00

Settings 0.00 to 60.00Hz Unit: 0.1sec



This parameter sets the frequency at which the DC Braking will begin during

deceleration.

Master

Frequency

Min. output

Freq.

Pr.29

Pr.31

Pr.30

DC Braking Current %

OFF

Pr.28

Start-point

for DC

braking

Operation

command

time(s)

Notes:

1. DC Braking during starting is used for loads that may move before the AC drive starts,

such as hoists and cranes. These loads may also be moving in the wrong direction. Under

such circumstances, the DC Braking can be used to hold the load in position before

applying a forward motion.

2. DC Braking during stopping is used to stop faster than the ramp-to-stop or to hold a

stopped load in position. A dynamic braking resistor may be needed in order to stop loads

of high inertia.

Pr.32

Momentary Power Loss Operation Selection Factory Setting: 00

Settings 00 Operation stops after momentary power loss

Operation continues after momentary power loss Speed search starts

with the Master Frequency reference value

Operation continues after momentary power loss Speed search starts

with the min frequency

Pr.33

Maximum Allowable Power Loss Time Factory Setting: 2.0 sec

Settings 0.3 to 5.0 sec Unit: 0.1sec



After a power loss, the AC drive will resume operation only if the power loss duration is

shorter than the time defined by Pr.33. If the Maximum Allowable Power Loss Time is

exceeded, the AC drive output is then turned off.

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