0471-0028-04
Safety information
Introduction
This braking resistor has been especially designed to be mounted within the heatsink of the Unidrive SP size 2. The design of the resistor is such that
no thermal protection circuit is required, as the device will fail safely under fault conditions. The in built software overload protection is set up at default
to protect the braking resistor.
Contents of the box (1220-2758-01)
The following items should be supplied in the box:
1x 37.5
Ω
Brake resistor assembly 1x Through hole grommet 1x Wire clip 1x Installation sheet
Fitting instructions
Unidrive SP Size 2 Braking
Resistor Installation Sheet
Stored charge
The drive contains capacitors that remain charged to a potentially lethal voltage after the AC supply has been disconnected. If the drive
has been energised, the AC supply must be isolated at least ten minutes before work may continue.
Refer to section 3.1
Safety information
in the
Unidrive SP User Guide
.
If the drive has been used at high load levels for a period of time, the heatsink and heatsink mounted braking resistor can reach
temperatures in excess of 70°C (158°F). Human contact with the heatsink and heatsink braking resistor should be restricted.
To avoid the risk of fire when the drive is surface mounted with the braking resistor fitted, the back plate should be a non-flammable
material.
Figure 1-1 Removing the DC terminal cover and break-outs
•
To remove the DC terminal cover, undo the screw
and lift off as shown in the diagram opposite.
•
When replacing the terminal covers the screws
should be tightened to a maximum torque of 1 N m
(0.7 lb ft).
•
The two break-outs that line up with the BR and
DC2 terminal connections must be removed, as
shown in the diagram opposite.
•
Grasp the 48V/DC terminal cover break-outs with
pliers and twist to remove.
•
Remove any flash / sharp edges once the break-
outs are removed.
Figure 1-2 Removing the baffle plate
•
Lift the hinged fan baffle by pushing plastic tabs in
the direction shown (1). Push tab in the direction
shown (2), and lift the baffle as shown (3).
•
Remove the metal heatsink baffle plate by
removing the two screws. These two screws are no
longer required.
Figure 1-3 Modifying the fan baffle
•
Remove 5mm (0.197in) from the length of the clip
on the plastic fan baffle.
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WARNING
WARNING
WARNING
Pozi Pz2
Flat 5mm
Remove these
two break-outs
2
3
1
1
Remove 5mm
(0.197in) from
the length
of this clip
