VLT® 4000 VT
connecting one end of the shield to ground via a
100nF capacitor (keeping leads short).
■
Electrical installation,controlcables
Torque: 4.5 - 5 ln lb
Screw size: M3
See
Grounding of shielded (armoured control cables
for correct termination of control cables.
No.
Function
04, 05
Relay output 1 can be used for
indicating status and warnings.
12, 13
Voltage supply to digital inputs. For
the 24 V DC to be used for digital
inputs, switch 4 on the control card
must be closed, position "on".
16-33
Digital inputs. See parameters
300-307
Digital inputs
.
20
Common for digital inputs.
39
Common for analog/digital outputs.
Must be connnected to terminal 55
by means of a three-wire transmitter.
See
Examples of connection
.
42, 45
Analog/digital outputs for indicating
frequency, reference, current and
torque. See parameters 319-322
Analoge/digital outputs
.
50
Supply voltage to potentiometer and
thermistor 10 V DC.
53, 54
Analog voltage input, 0 - 10 V DC.
55
Common for analog voltage inputs.
60
Analog current input 0/4-20 mA. See
parameters 314-316
Terminal 60
.
61
Termination of serial communication.
See
Grounding of shielded
(armoured control cables
.
This terminal is not normally to be
used.
68, 69
RS 485 interface, serial
communication. Where the
VLT AFD is connected to a bus,
switches 2 and 3 (switches 1- 4 -
see next page) must be closed on
the first and the last VLT AFD. On the
remaining VLT AFD, switches 2 and
3 must be open. The factory setting
is closed (position on).
■
Switches 1-4
The dipswitch is located on the control card. It is used
for serial communication and external DC supply.
The switching position shown is the factory setting.
Switch 1 has no function.
Switches 2 and 3 are used for terminating an RS 485
in-terface, serial communication. In the first and the
last VLT AFD, switches 2 and 3 must be ON. In the
other VLT AFD, switches 2 and 3 must be OFF.
Switch 4 is used if an external 24 V DC supply is required
for the control terminals. Switch 4 separates the
common potential for the internal 24 V DC supply from
the common potential of the external 24 V DC supply.
NOTE
Please note that when Switch 4 is in position
"OFF", the external 24 V DC supply is
galvanically isolated from the VLT AFD.
MG.40.A4.22 - VLT is a registered Danfoss trademark
49
Installation