Danfoss VLT Midi Drive FC 280 Operating Manual page 23

Electrical Installation
Start Command
Off
Start Delay
Start Speed
MAV
0
Output Current
0
Active Brake Delay
/
Relay DO Status
Off
Activated
.
Mech Brake Status
1) DC injection current during "Active Brake Delay" after MAV reduced to "0" . Only support in some products.
Note:
2)
Only support in some products.
Illustration 4.11 Mechanical Brake
The frequency converter is not a safety device. It is the
responsibility of the system designer to integrate safety
devices according to relevant national crane/lift
regulations.
MG07A402
Operating Guide
On
Release Brake Current
Start Current
Reaction time of
.
mech brake
Danfoss A/S © 10/2017 All rights reserved.
On
Reaction time of
.
mech brake
Released
L1(N) L2(L) L3
Frequency converter
U V W
Mechanical
brake
Motor Shaft
Brake power circuit
Illustration 4.12 Connecting the Mechanical Brake to the
Frequency Converter
Off
Active Brake Speed
t
1)
DC Injection Current
t
2)
Active Brake Delay
Off
Activated
Output
relay
02 01
Command circuit
220 V AC
Output
A1
Freewheeling
contactor
diode
input
A2
380 V AC
21
4 4