Danfoss VLT Midi Drive FC 280 Operating Instructions Manual page 19

Electrical Installation
Terminal Parameter
Serial communication
61 –
8-3* parameter
68 (+)
group
8-3* parameter
69 (-)
group
Relays
01, 02, 03 5-40
Table 4.2 Terminal Descriptions - Serial Communication
4.8.2 Wiring to Control Terminals
Control terminal connectors can be unplugged from the
frequency converter for ease of installation, as shown in
Illustration 4.8.
For details about STO wiring, refer to chapter 6 Safe Torque
Off (STO).
NOTICE
Keep control cables as short as possible and separate
them from high power cables to minimize interference.
1. Loosen the screws for the terminals.
2. Insert sleeved control cables into the slots.
3. Fasten the screws for the terminals.
4. Ensure that the contact is firmly established and
not loose. Loose control wiring can be the source
of equipment faults or less than optimal
operation.
See chapter 9.5 Cable Specifications for control terminal
cable sizes and chapter 7 Application Examples for typical
control cable connections.
MG07A102
Operating Instructions
Default
Description
setting
Integrated RC-
filter for cable
screen. ONLY for
– connecting the
screen when
experiencing
EMC problems.
RS485 interface.
–
A control card
switch is
provided for
–
termination
resistance.
Form C relay
output. These
relays are in
various locations
depending upon
the frequency
[9] Alarm
converter config-
uration and size.
Usable for AC or
DC voltage and
resistive or
inductive loads.
Danfoss A/S © 11/2015 All rights reserved.
4.8.3 Enabling Motor Operation
(Terminal 27)
A jumper wire is required between terminal 12 (or 13) and
terminal 27 for the frequency converter to operate when
using factory default programming values.
•
Digital input terminal 27 is designed to receive 24
V DC external interlock command.
•
When no interlock device is used, wire a jumper
between control terminal 12 (recommended) or
13 to terminal 27. The jumper provides an
internal 24 V signal on terminal 27.
•
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.
•
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.
If the frequency converter is in alarm mode or in an
overvoltage situation, the mechanical brake immediately
closes.
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.
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