44 • Chapter 5 - Wiring Procedure ARTDriveG Instruction manual
5.5.2 Engineering Notes
Cables for analog reference and correction values should be screened (connection to the following terminals 25, 26, 27,
28, 29, 30).
The screen should be on one side of the Inverter on terminal PE1. The same applies to the frequency signals for setting
the reference value or feed back and for the connected speed and current displays (terminals 26, 33, 31).
Grounding the reference point
The reference point of shield cable for the control terminals must be normally grounded (to the terminal 21 in case of one
inverter).
Where several inverters are used in a single installation, their reference points of shield cable for the control terminals
should be linked and grounded to the ground reference of the cabinet (with due attention to the minimum cable cross-
section stated above).
Direct connection to PLC input/output sections
The following points should be noted when the control commands or reference values are taken directly from the input/
output level of a programmable controller.
Grounding of the 0 V rail of a PLC is generally required. In this instance the reference points for the control commands on
the Inverter (terminals 10, 11) must not be grounded. To provide a high level of noise immunity, it is recommended that a
0,1
µ
F 250V DC capacitor be connected between terminals 10,11 and ground. Where an installation contains several
Inverters, this measure should be taken on each Inverter.
Relay on the Inverter
To provide improved noise immunity, RC suppressors should be connected in parallel with the contactor coils, which are
switched onto the Inverter by one of the potential-free contacts.
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