Control Techniques Unidrive LV Series User Manual

Unidrive LV model sizes 1 to 3 Installation Guide
Issue code: uliu1
Installing the Drive 2-31
General features
1. Single power-ground bus-bar, or low-
impedance ground terminal.
2. Incoming
AC supply ground connected to the
power ground bus-bar.
3. Connect grounds of any other circuits to the
power ground bus-bar.
4. Site ground, if required.
5. Metal back-plate, safety bonded to the power
ground bus-bar.
6. System isolator, circuit contactors and
fuses/MCB.
7. Alternative position for Drive fuses/MCB.
8. Motor-frame ground connection, if required.
9. Optional braking resistor mounted externally,
protected by a metal grille.
10. Thermal protection device to protect the
braking resistor.
Routine EMC precautions
11 Use four-core cable to connect the motor to
the Drive as shown. The ground conductor in
the motor cable must be connected only to the
ground terminals of the Drive and motor; it
must not be connected directly to the power-
ground bus-bar.
12. If the wiring for sensitive signal circuits is to be
parallel to an unshielded motor cable (or cables
for an unfiltered power supply) for more than
1 metre (3 feet), ensure the separation is at
least 0.3m (12 in).
If the parallel run is to exceed 10 metres (30
feet), increase the separation proportionally.
For example, if the parallel run is to be
40 metres, the spacing must be 0.3 x 40 ÷ 10 =
1.2 metres.
When a motor-thermistor is used, this
constraint does not apply to the cable
connecting the thermistor to the Drive. The
motor-thermistor cable must be shielded (as
shown in Figures 3–4 and 3–5 in the User Guide).
13. Do not place sensitive signal circuits in a zone
extending 0.3m (12 in) all around the Drive.
14. If the control circuit 0V is to be grounded, this
should be done at the system controller (eg.
PLC) and not at the Drive. This is to avoid
injecting noise currents into the 0V circuit.
15. When the braking-resistor wiring is unshielded,
ensure a minimum spacing of 0.3m (12 in) from
signal wiring.
Routine EMC precautions (model sizes 1 to 3)

Control Techniques Unidrive LV Series Specifications

General

Brand	Control Techniques
Model	Unidrive LV Series
Category	DC Drives
Language	English