2.4.5.4 Using Shielded Control Cables
Correct shielding
The preferred method in most cases is to secure control
and serial communication cables with shielding clamps
provided at both ends to ensure best possible high
frequency cable contact.
If the ground potential between the adjustable frequency
drive and the PLC is different, electrical noise may occur
that will disturb the entire system. Solve this problem by
fitting an equalizing cable next to the control cable.
Minimum cable cross-section: 0.025 in
2
[16 mm
2
].
1
2
PE
FC
PE
PLC
130BB922.12
PE
PE
<10 mm
Figure 2.14 Correct Shielding
1
Min. 0.025 in
2
[16 mm
2
]
2
Equalizing cable
Table 2.6 Legend to
50/60 Hz ground loops
With very long control cables, ground loops may occur. To
eliminate ground loops, connect one end of the shield-to-
ground with a 100 nF capacitor (keeping leads short).
100nF
FC
PE
PE
PLC
<10 mm
130BB609.12
Figure 2.15 50/60 Hz Ground Loops
Avoid EMC noise on serial communication
This terminal is grounded via an internal RC link. Use
twisted-pair cables to reduce interference between
conductors. The recommended method is shown below:
PE
FC
PE
FC
130BB923.12
PE
PE
69
68
61
69
68
61
1
2
<10 mm
Figure 2.16 Twisted-pair Cables
1
Min. 0.025 in
2
[16 mm
2
]
2
Equalizing cable
Table 2.7 Legend to
Alternatively, the connection to terminal 61 can be
omitted:
PE
FC
PE
FC
130BB924.12
PE
PE
69
69
68
68
1
2
<10 mm
Figure 2.17 Twisted-pair Cables without Terminal 61
1
Min. 0.025 in
2
[16 mm
2
]
2
Equalizing cable
Table 2.8 Legend to
2.4.5.5 Control Terminal Functions
Adjustable frequency drive functions are commanded by
receiving control input signals.
•
Each terminal must be programmed for the
function it will be supporting in the parameters
associated with that terminal. See
for
terminals and associated parameters.
•
It is important to confirm that the control
terminal is programmed for the correct function.
See
for details on accessing
parameters and
for details on programming.
•
The default terminal programming is intended to
initiate adjustable frequency drive 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 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.
Installation
VLT
®
AutomationDrive Instruction
Manual
2-10
MG33AM22 - VLT
®
is a registered Danfoss trademark
2
2
Содержание FC 300
Страница 1: ...MAKING MODERN LIVING POSSIBLE Instruction Manual VLT AutomationDrive FC 300 0 25 75 kW ...
Страница 2: ......
Страница 8: ...Contents VLT AutomationDrive Instruction Manual MG33AM22 VLT is a registered Danfoss trademark ...
Страница 14: ...Introduction VLT AutomationDrive Instruction Manual 1 6 MG33AM22 VLT is a registered Danfoss trademark 1 1 ...
Страница 62: ...Status Messages VLT AutomationDrive Instruction Manual 7 4 MG33AM22 VLT is a registered Danfoss trademark 7 7 ...
Страница 109: ...Index VLT AutomationDrive Instruction Manual MG33AM22 VLT is a registered Danfoss trademark 12 5 ...
Страница 110: ...www danfoss com drives MG33AM22 130R0300 MG33AM22 Rev 2013 03 12 ...