The digital and analog in- and outputs must be connected separately to the VLT AQUA Drive common inputs (terminal 20, 55, 39) to avoid ground currents
from both groups to affect other groups. For example, switching on the digital input may disturb the analog input signal.
NB!
Control cables must be screened/armoured.
1.
Use a clamp from the accessory bag to connect the screen to
the frequency converter de-coupling plate for control cables.
See section entitled
Earthing of Screened/Armoured Control Cables
for
the correct termination of control cables.
5.3.14 Switches S201, S202, and S801
Switches S201 (A53) and S202 (A54) are used to select a current (0-20
mA) or a voltage (0 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
Diagram showing all electrical terminals
in section
Electrical
Installation.
Default setting:
S201 (A53) = OFF (voltage input)
S202 (A54) = OFF (voltage input)
S801 (Bus termination) = OFF
NB!
It is recommended to only change switch position at power off.
5 How to Install
VLT
®
AQUA Drive Design Guide
134
MG.20.N5.02 - VLT
®
is a registered Danfoss trademark
5