Danfoss VLT 5027 Operating Instructions

VLT
®
5000 Series
Special
functions
175ZA447.10
Quick discharge
activated
Check 24 Volts
external DC supply
TRIP (RESET)
Q.DISCHARGING FAILED
No 24 Volts external
DC supply
Q.DISCHARGING FAILED
Timeout
Parameter 408 = [1]
Discharge
Discharge completed
POWER IS DISCHARGED
TRIP (RESET)
ALARM:33
ALARM:33
24 Volts external
DC supply OK
Start
Quick discharge
■ Mains failure/quick discharge with mains
failure inverse
The first column in the table shows Mains failure ,
which is selected in parameter 407. If no function
is selected, the mains failure procedure will not be
carried out. If Controlled ramp-down [1] is selected,
the frequency converter will take the motor down to 0
Hz. If Enable [1] has been selected in parameter 408,
a quick discharge of the intermediate circuit voltage
will be carried out after the motor has stopped.
Usingadigitalinput,itispossibletoactivatemains
failure and/or quick discharge. This is done by
selecting Mains failure inverse on one of the control
terminals (16, 17, 29, 32, 33). Mains failure inverse
is active in the logical ’0’ situation.
NB!:
The frequency converter can be completely
damaged if the Quick-discharge function
is repeated, using the digital input while
mains voltage is on.
Mains failure par.
407
Quick discharge par. 408 Mains failure inverse digital
input
Function
No function [0] Disable [0] Logical ’0’ 1
No function [0] Disable [0] Logical ’1’ 2
No function [0] Enable [1] Logical ’0’ 3
No function [0] Enable [1] Logical ’1’ 4
[1]-[4] Disable [0] Logical ’0’ 5
[1]-[4] Disable [0] Logical ’1’ 6
[1]-[4] Enable [1] Logical ’0’ 7
[1]-[4] Enable [1] Logical ’1’ 8
Function no. 1
Mains failure and quick discharge are not active.
F
unction no. 2
Mains failure and quick discharge are not active.
F
unction no. 3
The digital input activates the quick discharge function,
regardless of the intermediate circuit voltage level and
regardless of whether the motor is running.
F
unction 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.
MG.51.A9.02 - VLT is a registered Danfoss trademark
93

Danfoss VLT 5027 Specifications

General

Brand	Danfoss
Model	VLT 5027
Category	DC Drives
Language	English