Brake Resistor; Mechanical Brake - Danfoss VLT Decentral Drive FCD 302 Operating Manual

Electrical Installation
•
It is recommended that control wiring is rated for
600 V.
•
Isolate control wiring from high-power
components in the frequency converter.
•
If the frequency converter is connected to a
thermistor, for PELV isolation, ensure that control
wiring is reinforced/double insulated.
4 4
Terminal
number
01, 02, 03
04, 05, 06
12, 13
18, 19, 32, 33 Digital inputs. Selectable for NPN or PNP function
27, 29
35
36
37
20
39
42
50
53, 54
55
61
68 (+), 69 (-)
22
Function
Relay 1 output. Usable for AC or DC voltage and
resistive or inductive loads.
Relay 2 output. Usable for AC or DC voltage and
resistive or inductive loads.
24 V DC digital supply voltage. Useable for digital
inputs and external transducers. To use the 24 V
DC for digital input common, program
parameter 5-00 Digital I/O Mode for PNP operation.
in parameter 5-00 Digital I/O Mode. Default is PNP.
Digital inputs or outputs. Programmable for either
parameter 5-01 Terminal 27 Mode for terminal 27
and parameter 5-02 Terminal 29 Mode for terminal
29 selects input/output function. Default setting is
input.
Common (-) for external 24 V control back-up
supply. Optional.
External + 24 V control back-up supply. Optional.
Safe Torque Off. See chapter 4.16 Safe Torque Off
(STO) for details.
Common for digital inputs. To use for digital input
common, program parameter 5-00 Digital I/O
Mode for NPN operation.
Common for analog output.
Analog output. Programmable for various
functions in parameter group 6-5* Analog Output
1. The analog signal is 0–20 mA or 4–20 mA at a
maximum of 500 Ω.
10 V DC analog supply voltage. 15 mA maximum
commonly used for a potentiometer or thermistor.
Analog input. Selectable for voltage (0 to ±10 V)
or current (0 or 4 to ±20 mA). Closed is for
current and open is for voltage. Switches are
located on the frequency converter control card.
See chapter 4.14 DIP Switches
Common for analog inputs.
Common for serial communication (RS485
interface). See chapter 4.3 Grounding
RS485 interface. When the frequency converter is
connected to an RS485 serial communication bus,
a switch on the control card is provided for
termination resistance. Set the switch to ON for
termination and OFF for no termination.
Danfoss A/S © 11/2016 All rights reserved.
®
VLT Decentral Drive FCD 302
Terminal
number
62
63
66
67
B01–B12
G, R, V, N, P
Table 4.3 Terminal Description

4.11 Brake Resistor

Number
81 (optional function)
82 (optional function)
Table 4.4 Brake Resistor Terminals
The connection cable to the brake resistor must be
shielded/armored. Connect the shield to the metal cabinet
of the frequency converter and to the metal cabinet of the
brake resistor with cable clamps.
Dimension the cross-section of the brake cable to match
the brake torque.

4.12 Mechanical Brake

Number
122 (optional
function)
123 (optional
function)
Table 4.5 Mechanical Brake Terminals
In hoisting/lowering applications, control of electro-
mechanical brake is required:
•
•
•
•
When the frequency converter enters alarm mode or is
exposed to an overvoltage situation, the mechanical brake
Function
RxD/TxD –P (red cable) for PROFIBUS. See the
®
VLT PROFIBUS DP MCA 101 Installation Guide for
details.
RxD/TxD –N (green cable) for PROFIBUS.
0 V for PROFIBUS.
+5 V for PROFIBUS.
B-option. See dedicated literature for details.
Connection of LCP.
Function
R- Brake resistor terminals
R+
Function
MBR+ Mechanical brake
UDC = 0.45 x RMS mains voltage
MBR-
Maximum current = 0.8 A
The brake is controlled using the special
mechanical brake control/supply terminals 122
and 123.
Select [32] Mechanical brake control in parameter
group 5-4* Relays, [1] Array, Relay 2 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 2-21 Activate Brake Speed [RPM] or
parameter 2-22 Activate Brake Speed [Hz]. The
brake engages only when the frequency
converter performs a stop command.
MG04F502