Danfoss VLT Aqua Drive FC 202 Operating Instructions Manual page 51

®
VLT AQUA Drive
Operating Instructions
[Auto on]
enables the frequency converter to be controlled via the control terminals and/or serial commu-
nication. When a start signal is applied on the control terminals and/or the bus, the frequency
converter will start. The key can be
LCP
.
[Reset]
is used for resetting the frequency converter after an alarm (trip). The key can be
or Disabled
6.1.4. RS-485 Bus Connection
One or more frequency converters can be con-
nected to a controller (or master) using the
RS-485 standard interface. Terminal 68 is con-
nected to the P signal (TX+, RX+), while ter-
minal 69 is connected to the N signal
(TX-,RX-).
If more than one frequency converter is con-
nected to a master, use parallel connections.
In order to avoid potential equalizing currents in the screen, earth the cable screen via terminal
61, which is connected to the frame via an RC-link.
Bus termination
The RS-485 bus must be terminated by a resistor network at both ends. If the drive is the first on
the last device in the RS-485 loop, set the switch S801 on the control card for ON.
For more information, see the paragraph
Enabled
NB!
An active HAND-OFF-AUTO signal via the digital inputs has higher priority than the
control keys [Hand on] [Auto on].
[0] via par. 0-43 Reset Keys on LCP
®
MG.20.M2.02 - VLT is a registered Danfoss trademark
6. How to operate the frequency converter
Disabled
[1] or [0] via par. 0-42
.
Illustration 6.6: Connection example.
Switches S201, S202, and S801
[Auto on] Key on
Enabled
[1]
.
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