Danfoss VACON 134U3015 Operating Manual page 25

Electrical Installation
•
Only for GLCP: When the status line at the
bottom of the LCP reads AUTO REMOTE COAST, it
indicates that the unit is ready to operate but is
missing an input signal on terminal 27.
NOTICE
UNABLE TO START
The frequency converter cannot operate without a signal
on terminal 27, unless terminal 27 is reprogrammed.
4.8.4 Mechanical Brake Control
In hoisting/lowering applications, it is necessary to
control an electro-mechanical brake.
•
Control the brake using any relay output or
digital output (terminal 27).
•
Keep the output closed (voltage-free) as long as
the frequency converter is unable to keep the
motor at standstill, for example due to the load
being too heavy.
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
MG07A502
Operating Guide
If the frequency converter is in 1 of the following
situations, the mechanical brake immediately closes.
On
Release Brake Current
Start Current
Reaction time of
.
mech brake
Danfoss A/S © 08/2018 All rights reserved.
•
Select [32] Mechanical brake control in parameter
group 5-4* Relays for applications with an electro-
mechanical brake.
•
The brake is released when the motor current
exceeds the preset value in
parameter 2-20 Release Brake Current.
•
The brake is engaged when the output frequency
is less than the frequency set in
parameter 2-22 Activate Brake Speed [Hz], and only
if the frequency converter carries out a stop
command.
•
In alarm mode.
•
In an overvoltage situation.
•
STO is activated.
•
Coast command is given.
On
Reaction time of
.
mech brake
Released
Off
Active Brake Speed
t
1)
DC Injection Current
t
2)
Active Brake Delay
Off
Activated
21
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