Danfoss VLT 5000 Series Operating Instructions Manual page 94

Parameter 408 = [1]
Quick discharge
activated
Check 24 Volts
external DC supply
No 24 Volts external
DC supply
24 Volts external
DC supply OK
Start
Quick discharge
Timeout
Discharge
Discharge completed
175ZA447.10
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.
Mains failure par. Quick discharge par. 408
407
No function [0] Disable [0]
No function [0] Disable [0]
No function [0] Enable [1]
No function [0] Enable [1]
[1]-[4] Disable [0]
[1]-[4] Disable [0]
[1]-[4] Enable [1]
[1]-[4] Enable [1]
Function no. 1
Mains failure and quick discharge are not active.
Function no. 2
Mains failure and quick discharge are not active.
Function 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.
MG.51.A9.02 - VLT is a registered Danfoss trademark
TRIP (RESET)
ALARM:33
Q.DISCHARGING FAILED
TRIP (RESET)
ALARM:33
Q.DISCHARGING FAILED
POWER IS DISCHARGED
Mains failure inverse digital
input
Logical '0'
Logical '1'
Logical '0'
Logical '1'
Logical '0'
Logical '1'
Logical '0'
Logical '1'
®
VLT 5000 Series
Using a digital input, it is possible to activate mains
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.
Function
1
2
3
4
5
6
7
8
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.
93