Switches S201, S202, And S801 - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
Avoid installation with twisted screen ends (pigtails). They spoil the screening effect at higher
frequencies.
If it is necessary to break the screen to install a motor isolator or motor contactor, the screen must
be continued at the lowest possible HF impedance.
Cable length and cross-section
The frequency converter has been tested with a given length of cable and a given cross-section
of that cable. If the cross-section is increased, the cable capacitance - and thus the leakage current
- may increase, and the cable length must be reduced correspondingly.
Switching frequency
When frequency converters are used together with Sine-wave filters to reduce the acoustic noise
from a motor, the switching frequency must be set according to the Sine-wave filter instruction
in Par. 14-01.
Aluminium conductors
Aluminium conductors are not recommended. Terminals can accept aluminium conductors but the
conductor surface has to be clean and the oxidation must be removed and sealed by neutral acid
free Vaseline grease before the conductor is connected.
Furthermore, the terminal screw must be retightened after two days due to the softness of the
aluminium. It is crucial to keep the connection a gas tight joint, otherwise the aluminium surface
will oxidize again.

6.3.12. Switches S201, S202, and S801

Switches S201 (A53) and S202 (A54) are used to select a current (0-20 mA) or a voltage (-10 to
10 V) configuration of the analog input terminals 53 and 54 respectively.
Switch S801 (BUS TER.) can be used to enable termination on the RS-485 port (terminals 68 and
69).
See drawing
Default setting:
Diagram showing all electrical terminals
S201 (A53) = OFF (voltage input)
S202 (A54) = OFF (voltage input)
S801 (Bus termination) = OFF
When changing the function of S201, S202 or S801 be careful not to use force for
the switch over. It is recommended to remove the LCP fixture (cradle) when oper-
ating the switches. The switches must not be operated with power on the frequency
converter.
MG.33.B9.02 - VLT ® is a registered Danfoss trademark
Electrical Installation.
in section
6. How to Install
6
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