Control Terminal Functions; Terminal 53 And 54 Switches; Mechanical Brake Control - Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual

Installation

2.4.5.5 Control Terminal Functions

Frequency converter functions are commanded by
receiving control input signals.
•
Each terminal must be programmed for the
2 2
function it will be supporting in the parameters
associated with that terminal. See Table 2.4 for
terminals and associated parameters.
•
It is important to confirm that the control
terminal is programmed for the correct function.
See 4 User Interface for details on accessing
parameters and 5 About Frequency Converter
Programming for details on programming.
•
The default terminal programming is intended to
initiate frequency converter functioning in a
typical operational mode.
2.4.5.6 Jumper Terminals 12 and 27
A jumper wire may be 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 a
24 V DC external interlock command. In many
applications, the user wires an external interlock
device to terminal 27
•
When no interlock device is used, wire a jumper
between control terminal 12 (recommended) or
13 to terminal 27. This provides in internal 24 V
signal on terminal 27
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No signal present prevents the unit from
operating
•
When the status line at the bottom of the LCP
reads AUTO REMOTE COASTING or Alarm 60
External Interlock is displayed, this indicates that
the unit is ready to operate but is missing an
input signal on terminal 27.
•
When factory installed optional equipment is
wired to terminal 27, do not remove that wiring.

2.4.5.7 Terminal 53 and 54 Switches

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Analog input terminals 53 and 54 can select
either voltage (0 to 10 V) or current (0/4-20 mA)
input signals
•
Remove power to the frequency converter before
changing switch positions
•
Set switches A53 and A54 to select the signal
type. U selects voltage, I selects current.
•
The switches are accessible when the LCP has
been removed (see Illustration 2.20). Note that
some option cards available for the unit may
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22
®
VLT AQUA Drive
Operating Instructions
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Illustration 2.20 Location of Terminals 53 and 54 Switches

2.4.5.8 Mechanical Brake Control

In hoisting/lowering applications, it is necessary to be able
to control an electro-mechanical brake:
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•
•
•
•
®
MG20M902 - VLT is a registered Danfoss trademark
cover these switches and must be removed to
change switch settings. Always remove power to
the unit before removing option cards.
Terminal 53 default is for a speed reference signal
in open loop set in 16-61 Terminal 53 Switch
Setting
Terminal 54 default is for a feedback signal in
closed loop set in 16-63 Terminal 54 Switch Setting
Control the brake using any relay output or
digital output (terminal 27 or 29).
Keep the output closed (voltage-free) as long as
the frequency converter is unable to 'support' the
motor, 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 2-20 Release Brake
Current.
The brake is engaged when the output frequency
is less than the frequency set in 2-21 Activate
Brake Speed [RPM] or 2-22 Activate Brake Speed