DESCRIPTION OF FUNCTIONS
38 | EN
6.2.3.4
Monitoring the control threshold
If the
switching point H1 is never reached during the suction cycle, the “H1 not reached” condition
monitoring warning will be triggered and the system status light will switch to yellow.
This warning is available at the end of the current suction phase and remains active until the next
suction cycle.
6.2.3.5
Monitoring the dynamic pressure
If possible, a dynamic pressure measurement is taken at the start of every suction cycle. The result of
this measurement is compared to the threshold points set for H1 and H2.
If the dynamic pressure is greater than (H2 - h2) but less than H1, the corresponding condition
monitoring warning will be set and the system status light will switch to yellow.
6.2.3.6
Monitoring of the supply voltages
The SCTMi measures the level of the U
S
and U
A
operating voltages. The measured value can be read
from the process data by IO-Link.
If the voltages are outside the valid range, the following status messages change:
Device status
Condition monitoring parameter
IO-Link event is generated
Bus module LED flashes
The SCTMi is not a voltage meter!
However, the measured values and the system responses derived from them provide a
helpful diagnostics tool for condition monitoring.
If there are undervoltages, the valves are no longer activated and the ejectors return to their basic
setting. NO ejectors switch to “Suction” mode. NC ejectors switch to “pneumatically OFF” mode If the
ejector is in manual mode, it leaves manual mode.
A condition monitoring event is also generated If there is an overvoltage.
6.2.3.7
Evaluation of system pressure
The internal analysis functions on the ejectors sometimes require the system pressure with which the
ejectors are operated. To make the results more precise, the actual pressure level can be
communicated to the SCTMi via the IO-Link process data. If no level is specified, the optimum
operating pressure is assumed for the calculations.
