The digital and analog inputs and outputs must be connected separately to the control cards of the unit (both filter and drive, 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.
Input polarity of control terminals
NOTE!
To comply with EMC emission specifications, shielded/armored cables are recommended. If a non-shielded/unarmored cable is used,
see section
Power and Control Wiring for Non-shielded Cables
. If non-shielded control cables are used, it is recommended to use ferrite
cores to improve EMC performance.
Connect the wires as described in the Instruction Manual for the adjustable frequency drive. Remember to connect the shields in a proper way to ensure
optimum electrical immunity.
4 How to Install
VLT HVAC Low Harmonic Drive Instruction
Manual
4-58
MG.16.A1.22 - VLT
®
is a registered Danfoss trademark
4
