Control Terminal Types - Danfoss VLT FC 103 Instruction Manual

Installation
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).
2 2
Figure 2.16
Avoid EMC noise on serial communication
This terminal is connected to ground via an internal RC
link. Use twisted-pair cables to reduce interference
between conductors. The recommended method is shown
below:
Figure 2.17
1
Min. 0.025 in
2 Equalizing cable
Table 2.10
Alternatively, the connection to terminal 61 can be
omitted:
Figure 2.18
1
Min. 0.025 in
2 Equalizing cable
Table 2.11
2-14
VLT
PLC FC
PE
PE <10 mm
100nF
FC FC
69
69
68 68
61
61
PE PE
<10 mm
PE PE
1
2
2 [16 mm 2 ]
FC FC
69 68
68 69
PE PE
<10 mm
PE PE
1
2
2 2
[16 mm ]
MG16J122 - VLT
®
Refrigeration Drive Instruction Manual

2.5.4 Control Terminal Types

Terminal functions and default settings are summarized in
2.5.6 Control Terminal Functions.
2
Figure 2.19 Control Terminal Locations
•
Connector 1 provides four programmable digital
input terminals, two additional digital terminals
programmable as either input or output, a 24 V
DC terminal supply voltage, and a common for
optional customer-supplied 24 V DC voltage
•
Connector 2 terminals (+)68 and (-)69 are for an
RS-485 serial communications connection
•
Connector 3 provides two analog inputs, one
analog output, 10 V DC supply voltage, and
commons for the inputs and output.
•
Connector 4 is a USB port available for use with
the MCT 10 Set-up Software
•
Also provided are two Form C relay outputs that
are located on the power card.
•
Some options available for ordering with the unit
may provide additional terminals. See the manual
provided with the equipment option.
®
is a registered Danfoss trademark
3
4
1