Pneumatech HTM02-01, Operation And Maintenance Manual, Page: 53 / 93

Installation, Operation and Maintenance Manual
Medical Vacuum Plant Page 55
8.4 Controller alarms and faults
8.4.1
Controller alarms and faults
Different alarms can be transmitted to the hospital control room by means of digital outputs. The
configuration of the potential free contacts is dual. As such there is for instance “Plant Fault“ and
“2nd Plant Fault”. One set of alarms is intended for BMS (Building Management System), the
other set is provided with additional resistors and intended to connect to Zeus 15 Central Alarm
System. Consult the Service Diagram for the correct configuration.
When an alarm is shown on the central controller, the pump controller and/or the hospital’s control
room, the necessary actions must be undertaken to investigate and remedy as soon as possible.
There are three different alarm levels. A single alarm or a combination of alarms is possible.
Per alarm, the possible originating faults are described along with their remedies. When trying to
remedy problems, always take into account the maintenance warnings (see Maintenance
warnings).
When no alarm is active, the normal status is shown in green colour on the display.
8.4.2
Plant fault
Description
A fault has occurred which potentially leads to the system performing suboptimal, and if left
unattended could result in the loss of vacuum.
Figure 8-34; Controller alarms and faults – Plant fault
Causes and remedies
First, all pump controllers must be checked for the presence of red LED’s being lit (unless if
causes 1 or 2 apply, see below). Navigate to the pump overview screen to ensure no warning
icons (see Interface icons and menu structure) are present on any of the pump bars.
When no red LED is lit on one or more pump controllers and no warning icon is present on the
pump status bars of the central controller, it is possible there was an unexpectedly high air
demand which is larger than the design flow. In such case, all vacuum pumps - including the
backup pump - will be called to assist in order to cope with the high air demand. If this situation
prevails, the red LED on the central controller is lit. The red LED will be extinguished as soon as
vacuum equals the value under Pressure band 1 High (default is -870 mbar(e)) is reached and
the backup pump is stopped.
In case it is not desired that a Plant Fault is generated when the backup pump is called at high air
demands, there is the option to deactivate this function in the submenu Service Maintenance. Put
Backup unit in Operation to “Not Activated” and no red LED neither Plant Fault will be shown on
the central controller.
It is also possible to suppress the relay output for Plant fault on the IO2 module. This can be done
by putting Disable Plant Fault Output to “Yes” in the submenu Service Maintenance. In this case
the red LED and Plant Fault is shown on the central controller but there will be no Digital output to
BMS (Building Management System) nor Zeus 15. Take care with this option because selecting
“Yes” for “Disable Plant Fault Output” will be valid for any Plant Fault which might prevail.