88
GB
8
Dismantling / Mounting in Case of Service
1505093, Edition 2012-05, Version 5
Figure 13: Dismantling the end device
from the NRH spring arm
8.5 Dismantling the end device from the NRH spring arm
(See "Figure 13")
Follow the safety instructions
Follow the general safety instructions prescribed in
“Chapter 8.1” on page 80
.
1. Check whether the end device (e.g. OR lamp) on the NRH spring arm
5
can be
rotated more than 360degrees.
2. If this is the case, an internal 3- or 5-pole plug coupling
5
,
7
has been mounted
and the end device (e.g. OR lamp) may be dismantled by you as a technician
authorised by the operator.
Sudden release of spring arm
The NRH spring arm
5
contains a powerful spring. When the end device
(e.g. OR lamp) is dismantled, the spring arm can suddenly jump up and
may cause serious injury:
• Before removing the end device (e.g. OR lamp), make sure that the
vertical lift of the NRH spring arm
5
as described in
“Chapter 9.4.2” on
page 100
is restricted to the lowermost end stop (horizontal position).
3. Restrict the NRH spring arm
5
to the horizontal position as described in
“Chapter
9.4.2” on page 100
.
➥
It must no longer be possible to move the NRH spring arm
5
upwards beyond the
horizontal position.
Dismantling the brake and sleeve securing screws
4. Turn the fitting aperture
3
of the sleeve
1
downwards.
5. Unscrew the brake screw
6
at the bottom of the sleeve
1
.
6. Rotate the sleeve
1
90 degrees and unscrew the first end device securing
screw
2
.
7. Rotate the sleeve
1
180 degrees and unscrew the second end device securing
screw
2
.
NOTE – Different plug couplings
Depending on the version of the end device (e.g. OR lamp), the NRH spring arm
5
is equipped with a 3-pole
5
or 5-pole plug coupling
7
.
8. Carefully remove the end device (e.g. OR lamp) from the NRH spring arm
5
,
keeping it precisely axially aligned.
9. Turn the fitting aperture
3
of the sleeve
1
downwards.
10. Screw in the brake screw
6
at the bottom of the sleeve
1
.
11. Rotate the sleeve
1
90 degrees and screw in the first end device securing screw
2
.
12. Rotate the sleeve
1
180 degrees and screw in the second end device securing
screw
2
.
Marking
If you do not mount another end device (e.g. OR lamp) directly after dismantling, the plug
coupling in the NRH spring arm
5
is energised whilst the mains supply is switched on.
1. Mark the mains supply in the room with a warning sign:
ELECTRIC SHOCK HAZARD – DO NOT SWITCH ON THE POWER SUPPLY!
2. Mount the end device (e.g. OR lamp) later as described in
“Chapter 8.6” on page 89
.
1
WARNING
