Siemens SIPART DR22 Manual page 232

5 Maintenance
5.1 General information and handling
D Replacing the power supply unit
-- Pull out the mains plug!
-- Loosen the clamps and remove the controller from the panel.
-- Loosen the four fixing screws of the power supply unit (see (2) Figure 5-3)
(not the 3 plated Phillips screws (3) Figure 5-3) and pull out the power supply unit in
screw direction.
-- Bend the PE conductor contact spring slightly upwards and place the new power supply
unit carefully on the plug terminals in screw direction and make sure the guide lugs snap
in by moving slightly from side to side (it can no longer be moved from side to side when
it has snapped in).
-- Tighten the four fixing screws diagonally.
1 2
7
2
1 PE conductor contact spring
2 fixing screws for the power supply unit (shaft screw)
3 Plated Phillips screws for
fixing the power supply circuit board in the casing
Figure 5-3 Fixing the power supply unit
D LED test and software state
If the Shift key (12) is pressed for about 10 s ("PS" flashes on the manipulated variable dis-
play after about 5 s), this leads to the LED test. All LEDs turn on, the digital displays indicate
"18.8.8.8" or " S 88.8." and a light bar covering three LEDs runs from 0 to 100 % (on reaching
100 %, the light bar starts again at 0 %).
If the Internal/External key (2) is pressed permanently in addition during the lamp test, "dr22"
appears on the digital w-display "dr22", the software state of the device appears on the
digital x-display and the current cycle time in ms appears on the y-display.
During the LED test and display of the software state the controller continues to operate
online in its last operating mode.
230
3
3 6
2
4
3
5
2
4 Power supply unit
5 Blanking plate
6 Plastic housing
7 Front module
Manual
SIPART DR22 6DR2210
C79000-G7476-C154-03