VLT® 7000 Booster
All about VLT 7000
Booster
The control unit attempts to correct the ramp if possible.
The inverter turns off to protect the transistors
and the intermediate circuit capacitors when a
certain voltage level is reached.
M
ains drop-out
During a mains drop-out, VLT 7000 Booster continues
until the intermediate circuit voltage drops below the
minimum stop level, which is typically 15% below VLT
7000 Booster’s lowest rated supply voltage.
The time before the inverter stops depends on the mains
voltage before the drop-out and on the motor load.
S
tatic overload
When VLT 7000 Booster is overloaded (the current
limit in parameter 215 Current limit,I
LIM
has been
reached), the controls will reduce the output frequency
in an attempt to reduce the load.
If the overload is excessive, a current may
occur that makes the frequency converter cut
out after approx. 1.5 sec.
Operation within the current limit can be limited in time
(0-60 s) in parameter 412 Trip delay overcurrent, I
LIM
.
MG.70.A1.02 - VLT is a registered Danfoss trademark
119
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General