Bruker BMPC/2, Technical Manual

Page: 82 / 136

82 Z31823_00_05
Troubleshooting
11.6 The NMR Console Switches Off Too Fast
The voltage supply for the NMR console supplies power to the BMPC/2. The NMR con-
sole is attached to terminal X3 of the BMPC/2 line control unit (see "Line Control Unit" on
page 59 ). Since the NMR console may be supplied only for a short time by the batteries
of the USP during a power failure, it is automatically switched off by a time delay relay
after a preset time.
The preset time can be adjusted anywhere between 1.5 minutes and 30 minutes. The
following section explains how to adjust the time delay.
11.6.1 Adjusting the NMR Console Turn-off Time
The adjustment of the turn-off time is made through the KM3 relay. To access the relay
open the upper back cover, the KM3 relay is found almost exactly in the middle of the
line control unit.
To change the time you need to move the yellow turning wheel. Turn the wheel down-
wards to shorten the time (minimum of 1.5 minutes), upwards to lengthen the time (max-
imum of 30 minutes).
Figure 11.5 Adjusting the NMR Console Turn-off Time
i
In the event of a
power failure
, the longer the console remains on the UPS, the shorter
the time that the vacuum pumps will be powered. A favorable value is within the range of
a maximum of 5 minutes.
Increase Time
Decrease Time
Shown is an adjustment of
ca. 6 minutes.