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Unidrive User Guide
49
Issue Number: 9 www.controltechniques.com
4.8.3 Variations in the EMC wiring
Control wiring
Control wiring which is connected to the drive and leaves the enclosure
must have one of the following additional treatments:
•
Pass the control cable(s) through a ferrite ring (part number 3225-
1004). More than one cable can pass through a ferrite ring. Ensure
the length of cable between the ferrite ring and the drive is not
greater than 125mm (5 in).
•
Use one or more cables having a separate overall shield. Bond this
shield(s) to the back-plate using an uninsulated metal clamp.
Position the clamp not further than 100mm (4 in) from the drive. Do
not make any other connections to either end of the overall shield.
Interruptions to the motor cable
The motor cable should ideally be a single piece of shielded or armoured
cable having no interruptions. In some situations it may be necessary to
interrupt the cable, as in the following examples:
Connecting the motor cable to a terminal block in the drive enclosure
Fitting a motor isolator switch for safety when work is done on the
motor
In these cases the following guidelines should be followed.
Terminal block in the enclosure
The motor cable shields should be bonded to the back-plate using
uninsulated metal cable-clamps which should be positioned as close as
possible to the terminal block. Keep the length of power conductors to a
minimum and ensure that all sensitive equipment and circuits are at
least 0.3m (12 in) away from the terminal block.
Figure 4-13 Connecting the motor cable to a terminal block in the
enclosure
Using a motor isolator-switch
The motor cable shields should be connected by a very short conductor
having a low inductance. The use of a flat metal coupling-bar is
recommended; conventional wire is not suitable.
The shields should be bonded directly to the coupling-bar using
uninsulated metal cable-clamps. Keep the length of the exposed power
conductors to a minimum and ensure that all sensitive equipment and
circuits are at least 0.3m (12 in) away.
The coupling-bar may be grounded to a known low-impedance ground
nearby, for example a large metallic structure which is connected closely
to the drive ground.
Figure 4-14 Connecting the motor cable to an isolator switch
Interruptions to the encoder cable
The screened cable should ideally not be interrupted throughout its run.
If intermediate terminal arrangements are included with ‘pigtails’ for the
screen connections, every pigtail will contribute additional injection of
electrical noise into the signal circuit. They should therefore be kept as
short as possible. If interruptions are unavoidable, either a suitable
connector with surrounding screen shell should be used, or a low-
inductance bar or plate should be used for the screen connection, similar
to that shown in Figure 4-14.
4.9 Control connections
4.9.1 General
Table 4-5 The Unidrive control connections consist of:
Key:
Destination parameter
- indicates the parameter which is being
controlled by the terminal
Source parameter
- indicates the parameter being output by the
terminal
Mode parameter
analog - indicates the mode of operation of the terminal, i.e. voltage
0-10V, current 4-20mA etc.
digital - indicates the mode of operation of the terminal, i.e. positive /
negative logic, open collector.
All analog terminal functions can be programmed in menu 7. See section
10.7
on page 145 for more information on control
terminal set-up.
All digital terminal functions can be programmed in menu 8. See section
10.8
on page 148 for more information on control
terminal set-up.
From the Drive
To the motor
Back-plate
Enclosure
Function
Qty
Programmability
Terminals
Differential analog input
1
Destination, mode, scaling,
5,6
Single ended analog
input
2
Destination, mode, scaling,
7,8
Analog output
2
Source, mode, scaling,
9,10
Digital input
3
Destination, mode,
27,28,29
Digital input / outputs
3
Destination / source, mode
24,25,26
Relay
1
Source
1,2
Drive enable
1
External trip (latching) or inhibit
(non latching)
30
10V supply
1
4
24V supply
1
22
0V analog
2
3,11
0V digital
2
21,23,31
Ensure the logic sense is correct for the control circuit to be
used. Incorrect logic sense could cause the motor to be
started unexpectedly.
Isolator
Coupling bar
From the
Drive
To the
motor
(If required)
CAUTION
Summary of Contents for Unidrive 1 Series
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