
CHAPTER 3 - INSTALLATION PROCEDURE
584S FREQUENCY INVERTER
3-19
Analogue Clean Earth
Dirty Earth
Digital Clean Earth
Metal Work Earth
AC/DC
AC/DC
AC/DC
PLC
PE
PE
PE
0D
0D
0D
0D
0A
0A
0A
Doors
Backplate
Metal
Work
110V
Control
24V
Control
Unscreened
Signals
Unscreened
Signals
STAR POINT
Incoming Safety Earth
To Motor
To Motor
To Motor
Screened
Screened
PE = protective earth
OA = analogue 0volts
OD = digital 0volts
PE
Sig/cntrl Screen
Power Screen Earth
Figure 3-7: Implementation of star-point earthing policy for multi-drive installation
Screening and Earthing When Wall Mounted
To provide for good EMC performance the recommended EMC filter must be fitted and the cables between the wall-
mount 584S620 drive module and the motor screened or armoured. Also screening of control and signal cables may
be required. Refer to the previous instructions on minimising radiated emission. In addition any connections to the
DC link must also be screened/armoured, with the screen connected at both ends (e.g. to the protective earth of the
dynamic brake resistor).
All 584S/620 drive modules comply with the radiated emission limits of EN55011 (1991) Class A when wall
mounted to these instructions, using the recommended EMC filter and screened motor control and signal cabling.
Products which meet the limits of Class A can be made to meet the more stringent limits of Class B by mounting
inside an enclosure with 10 dB attenuation between 30 and 100 MHz (which would typically be the attenuation
provided by a metal cabinet with no aperture at a dimension greater than 0.15m) and screening any control and
signal cabling outside of the cubicle. Minimise the length of unshielded cable inside the cubicle to prevent increased
radiated emission.
A single-point earthing policy as shown in Figure 3-6 is required.
The protective earth connection (PE) to the motor must run inside the screened cable between the motor and
584S/620 drive module where it is to be connected to the protective earth terminal in the gland box or on the drive
module (note, in accordance with EN60204 only one protective earth conductor is permitted at each earth terminal
contacting point) . Local wiring regulations may require the protective-earth connection of the motor to be connected
locally but this will not cause shielding problems due to relatively high RF impedance of the local earth connection.
The EMC filter must be permanently earthed in accordance with recommendations and warnings in the section
“
EMC Filters to Reduce Line Conducted Noise”
.
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Summary of Contents for 584S
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