Danfoss VLT 5000 Series User Manual

Function no. 4
Quick discharge is activated when the intermediate
circuit voltage has dropped to a given value and the
inverters have stopped. See procedure on previous
page.
Function no. 5
The digital input activates the mains failure function,
regardless of whether the unit receives any supply
voltage. See the different functions in parameter 407.
Function no. 6
The mains failure function is activated when the inter-
mediate circuit voltage has dropped to a given value.
The selected function in case of mains failure is se-
lected in parameter 407.
Function no. 7
The digital input activates both the quick discharge and
the mains failure function, regardless of the intermedi-
ate circuit voltage level and regardless of whether the
motor is running. First the mains failure function will be
active; subsequently there will be a quick discharge.
Function no. 8
Quick discharge and mains failure function are activa-
ted when the intermediate circuit level drops to a given
level.
First the mains failure function will be active; subse-
quently there will be a quick discharge.
Flying start
This function makes it possible to "catch" a motor that
is spinning freely and for the frequency converter to
take control of the motor speed. This function can be
enabled or disabled via parameter 445.
If flying start has been selected, there will be four sit-
uations in which the function is activated:
1. After a coast has been given via terminal 27.
2. After power-up.
3. If the frequency converter is in a trip state and
a reset signal has been given.
4. If the frequency converter releases the motor
because of a fault state and the fault disap-
pears before a trip, the frequency converter
will catch the motor and go back to the refer-
ence.
1. Flying start is active.
2. Flying start is active.
The search sequence for the spinning motor depends
on Rotation, frequency/direction (parameter 200). If
only clockwise is selected, the frequency converter will
start looking from Maximum frequency (parameter 202)
down to 0 Hz. If the frequency converter does not find
the spinning motor during the search sequence, it will
carry out a DC braking so as to try to bring the speed
of the spinning motor down to 0 rpm. This requires that
the DC brake is active via parameters 125 and 126. If
Both directions is selected, the frequency converter will
first find out in which direction the motor rotates and
then search for the frequency. If the motor is not found,
the system assumes that the motor is at a standstill or
is rotating at a low speed, and the frequency converter
will start the motor in the normal way after searching.
VLT
®
5000 Series
204 MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.

Danfoss VLT 5000 Series Specifications

General

Brand	Danfoss
Model	VLT 5000 Series
Category	DC Drives
Language	English