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48
Unidrive User Guide
www.controltechniques.com Issue Number: 9
4.8.2 EMC - Compliance
Figure 4-12 details specific points which must be observed as well as the sections on grounding and clearances in order to ensure compliance with
the standards detailed in the EMC data sheet.
Figure 4-12 EMC compliance
1. Unshielded wiring to the optional braking resistor(s) may be
used, provided the resistor is either in the same enclosure as
the drive, or the wiring does not run external to the
enclosure. When the braking resistor wiring is unshielded,
ensure a minimum spacing of 300mm (12in) from signal
wiring and the AC supply wiring to the RFI filter.
2. Ensure the AC supply and ground cables are at least the
following distances from the power module as well as from
the motor cable
Size 1 to 4: 100mm (4in), Size 5: 150mm (6in)
3. Size 4 and 5 only:
The AC supply cable must be shielded (screened) or steel-
wire armoured. Bond the shield to the enclosure wall using
standard cable-gland fixings.
4. Size 1 and 2:
RFI filter mounted at the side of the drive. Ensure a
separation of 5 to 10mm (0.2in to 0.4in) from the drive.
Minimise the length of cables between the RFI filter and
power module.
Size 3 to 5:
RFI filter mounted 150mm (6in) above the drive/power
module. The RFI filter casing is directly grounded to the
back-plate by the fixing screws.
5. Avoid placing sensitive signal circuits in a zone 300mm
(12in) all around the power module.
6. Ensure chassis directly grounded to the back-plate using
fixing screws. Screw threads tapped into the back-plate must
be used to ensure that a direct electrical connection is made.
An unpainted back-plate is required.
7. A shielded (screened) or steel-wire armoured cable must be
used to connect the power module to the motor. The shield
must be bonded to the back-plate using an uninsulated
metal cable clamp. Position the clamp as close as possible
to the drive/
power module.
Size 1 and 2: The clamp must be positioned no further than
100mm (4in) from the drive.
Size 3 and 4: The clamp must be positioned no further than
150mm (6in) from the drive.
Size 5: It may be necessary to use a flat metal plate of a
minimum width of 100mm (4in) as well as a clamp in order to
make the connection. The clamp must be fitted so that:
L1 < 150mm (6in) and (L1 + L2) < 450mm (18in)
8. Connect the shield of the motor cable to the ground terminal
of the motor frame using a link that is as short as possible
and not exceeding 50mm (2in) long. A full 360° termination
of the shield to the terminal housing of the motor is
beneficial.
9. Size 4 and 5 only
Back-plate bonded to the enclosure wall using a short, low
inductance connection. Two flat-braid cables of nominal size
12mm x 2.3mm (0.5in x 0.1in) are suitable, or a single
braided-cable of equivalent dimensions.
10. Size 5 only
Ensure that all power cables are at least 300mm (12in) from
the ribbon cables that connect to the control module.
Back-plate
Enclosure
L1
L2
L3
U
V
W
Drive/power module
RFI filter
Ground
L3
AC
supply
L1
L2
3
Optional external
braking resistor
O/L
2
1
7
8
6
4
5
9
10
L2
L1
L1 150mm (6in)
(L1 + L2) 450mm (18in)
<
<
Control module
- Size 5 only
Содержание Unidrive 1 Series
Страница 208: ......
