Control Techniques FXM5, User Manual

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FXM5 User Guide
www.controltechniques.com Issue Number: 5
Figure 3-5 shows an example of wiring arrangements for minimum radio-frequency
emissions. The actual arrangement used will have to be adapted to individual
requirements.
The following conditions must be met:
• The environment is acceptable (see section 3.2 Environment on page 4)
• The maximum permissible ambient temperature is not exceeded
• The EMC requirements are met
• The electrical installation meets safety requirements
3.8.1 Motor cable
In order to meet the EMC emissions requirements, it is preferable that one of the
following conditions applies for the motor cable:
• If the cable is to be entirely enclosed in grounded metal ducting, the cable does not
need to be shielded or armoured.
• If the FXM5 is to be mounted in a machine that has a grounded metal case, and the
motor cable is to be contained inside the case, the cable does not need to be
shielded or armoured.
• If the cable is to be exposed, it should be armoured or shielded. Alternatively,
unshielded cable could be used if an RFI filter is included in the output circuit of the
FXM5.
• If the length of the motor cable does not exceed 50 metres, very little radiation
should be produced. In this case, unshielded cable may be used on condition that
the EMC emissions requirements of the installation are considered.
3.8.2 RFI filter
An RFI filter type P2E/025/M7/- must be connected as shown in the AC supply circuit to
the FXM5. Mount the RFI filter beneath the FXM5 with a clearance of 300mm (12in).
Use the same type of filter if an RFI filter is to be included in the output circuit of the
FXM5.
The filter must be used in conjunction with a suitable RFI filter for the armature
supply. The filter input must obtain its supply from the input of the armature filter
and line chokes, otherwise it may be over-heated and possibly damaged by the
armature voltage notching.
3.8.3 Ground connections
The ground stud on the heatsink of the FXM5 must be connected to the power ground
bus-bar. This bus-bar must be connected to the enclosure ground by a safety ground
connection. It is essential that these connections are permanently installed, and cannot
be inadvertently disconnected.
The size of external grounding terminals should be appropriate to the size of the
grounding cables.
Ground loop impedance must conform to the requirements of local industrial safety
regulations.
Do not connect the signal 0V common connections to ground at the FXM5. Connect
them to ground at the isolated 0V bus-bar.
CAUTION