Pneumatech HTM02-01, Operation And Maintenance Manual, Page: 48 / 93

Installation, Operation and Maintenance Manual
Page 46 Medical Vacuum Plant
Figure 8-26; Central controller – Ethernet
Protections menu
When there is a problem with one of the direct inputs (see previous paragraph), the red warning
LED or blue service LED will be lit. When no problem is visible on the pump overview screen (see
Interface icons and menu structure), the Protections submenu must be consulted. For faults, the
warning disappears when the problem is remedied. The following situations are important (the
fault is indicated in yellow ):
Net pressure warning: When the limit is exceeded or no readout is obtained (indicated by stars
***), a problem with the sensor, cable or connections occurred. Taking into account the
maintenance warnings (see Maintenance warnings), check the sensor, the cable and the
connections for proper connection and correct wiring according to the service diagram. The fault
should be physically remedied (spare parts can be ordered, consult the spare part list), whereby
the yellow warning LED will automatically reset.
No valid pressure control: When the net pressure sensor is unavailable, the central controller has
no pressure feedback and can not control the pumps. Therefore it sends the pump controllers in
Forced Local mode until the problem is remedied.