Unidrive
LV
model sizes 1 to 3 Installation Guide
Issue code: uliu1
Installing the Drive 2-9
Using an RFI filter
STEP 5 For compliance with the emission
standards such as EN 50081-1 or EN 50081-2, use
the recommended RFI filter as shown in
Table 2–8. Use one RFI filter for each Drive.
(Standards that are met are specified in
Appendix C Data)
Make a note of this step number and the
following for each filter to be used:
• Size code or part number
• Maximum power dissipation figure
• IP rating
Table 2–8 RFI filter data
Model RFI filter
Size Part
number
Maximum
power
dissipation
(W)
IP
rating
UNI 1201
A
4200–0010 25 IP20
UNI 1202
A
4200–0010 25 IP20
UNI 1203
A
4200–0010 25 IP20
UNI 1204
A
4200–0010 25 IP20
UNI 1205
A
4200–0010 25 IP20
UNI 2201
B
4200–0027 40 IP20
UNI 2202
B
4200–0027 40 IP20
UNI 2203
B
4200–0027 40 IP20
UNI 3201
C
4200–1051 60 IP00
UNI 3202
C
4200–1051 60 IP00
UNI 3203
D
4200–1071 100 IP00
UNI 3204
D
4200–1071 100 IP00
Model size 1
When the motor cable is to exceed 50m (165 feet),
use RFI filter size B (4200–0027).
Using a braking resistor
Braking occurs when the Drive is decelerating the
motor, or is preventing the motor from gaining
speed due to mechanical influences. During braking,
energy is returned to the Drive by the motor.
When the motor is being braked by the Drive, the
maximum regenerated power that the Drive can
absorb is equal to the power dissipation (losses) of
the Drive.
When the regenerated power is likely to exceed
these losses, a braking resistor must be connected.
By default, the Drive brakes the motor under
PI control which extends the deceleration time as
necessary in order to keep the
DC bus at a constant
voltage. The method of braking can be changed; if
required, refer to Appendix D Menu 0 Parameters in
the User Guide.
Note
When a braking resistor is used, the Drive
should be operated in FASt ramp mode. If
this is not done, instability may arise. See
Braking resistor in Chapter 2 of the User
Guide.
Housing the resistor, and routing the
connecting cable
Warning
High temperatures
Braking resistors can reach
high temperatures. Locate
braking resistors so that
damage cannot result.
Use cable having insulation
capable of withstanding high
temperatures.
Warning
Overload protection
It is essential that an overload
protection device is
incorporated in the braking
resistor circuit; this is
described in Protection circuit
for an optional braking resistor in
S
TEP 8.
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