Enabling Motor Operation (Terminal 27); Voltage/Current Input Selection (Switches); Safe Torque Off (Sto); Mechanical Brake Control - Danfoss VLT AutomationDrive FC 301 Instruction Manual

Electrical Installation
4.8.3 Enabling Motor Operation
(Terminal 27)
A jumper wire may be required between terminal 12 (or
13) and terminal 27 for the adjustable frequency drive to
operate when using factory default programming values.
•
Digital input terminal 27 is designed to receive an
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 an internal 24 V
signal on terminal 27.
•
When the status line at the bottom of the LCP
reads AUTO REMOTE COAST, 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.
NOTICE!
The adjustable frequency drive cannot operate without a
signal on terminal 27 unless terminal 27 is re-
programmed.
4.8.4 Voltage/Current Input Selection
(Switches)
The analog input terminals 53 and 54 allow setting of
input signal to voltage (0–10 V) or current (0/4–20 mA).
Default parameter settings:
•
Terminal 53: speed reference signal in open-loop
(see 16-61 Terminal 53 Switch Setting).
•
Terminal 54: feedback signal in closed-loop (see
16-63 Terminal 54 Switch Setting).
NOTICE!
Disconnect power to the adjustable frequency drive
before changing switch positions.
1. Remove the local control panel (see Figure 4.10).
2. Remove any optional equipment covering the
switches.
3. Set switches A53 and A54 to select the signal
type. U selects voltage, I selects current.
MG33AN22
Instruction Manual
Figure 4.10 Location of Terminals 53 and 54 Switches

4.8.5 Safe Torque Off (STO)

To run Safe Torque Off, additional wiring for the adjustable
frequency drive is required, refer to Safe Torque Off
Instruction Manual for Danfoss VLT
Drives for further information.

4.8.6 Mechanical Brake Control

In hoisting/lowering applications, it is necessary to
control an electro-mechanical brake:
•
•
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
®
Adjustable Frequency
Control the brake using any relay output or
digital output (terminal 27 or 29).
Keep the output closed (voltage-free) as long as
the adjustable frequency drive is unable to keep
the motor at standstill, for example due to the
load being too heavy.
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