HBM MP85A - Page 35

Electrical connection
MP85A A0293_06_E00_03 HBM: public 35
Tip
The Reset signal can be generated externally or via the MP85A process
controller. For the latter, route the process signal “Reset piezo sensor” to a
digital output of the MP85A process controller (PME Assistant, “Digital outputs”
menu, Positive circuit logic).
TEDS
The CMD and CMA charge amplifiers from HBM have TEDS functionality,
which is available for the voltage input in the MP85A process controller from
hardware version V1.07.
For operation without TEDS, connect the measurement ground directly to pin 3
of the MP85A process controller. You then do not require the cable for the
TEDS module.
Measuring range selection
The (analog) CMA charge amplifier from HBM has measuring range switchover
RANGE1/RANGE2, which takes place via pin 2 of the charge amplifier. The
switching signal can be supplied by an external control system or the digital
outputs of the MP85A process controller. If a voltage of 0V is present at pin 2,
measuring range 1 (100% F
nom
) is enabled on the charge amplifier. If a
voltage of 24 V
DC
is present at pin 2, measuring range 2 is enabled (20% of
nominal (rated) force = 100% output span). The (digital) CMD charge amplifier
has 2 internal parameter sets. You can therefore switch the measuring range
via the digital input, for example. You can find further information in the
operating manual of the CMD.
In both cases, please note that the changed measuring range must also be
enabled in the MP85A process controller, either automatically via the TEDS
function or using the scaling option of the input channel.