Note that when you first switch-on the electrical supply, no Module will initially have control
of the iH system. The Module which you want to control the iH system must take control as
described above.
1.12.2 Setpoints, warning and alarm conditions
Note: Sensors which generate alarm and warning messages are not safety sensors: see Section 1.12.3.
Each Module which monitors sensors has a microprocessor. Each monitored sensor (except
for switch-type sensors, such as the oil monitors, which have only two output states: error or
no error) has four associated setpoints. The setpoints are: the low warning setpoint, the high
warning setpoint, the low alarm setpoint and the high alarm setpoint. The microprocessor
compares the sensor data to the setpoints to determine if an alarm or warning condition
exists:
•
If the sensor data is below the low warning setpoint or above the high warning setpoint, a
warning condition exists. A warning condition means that some aspect of the operation of the
iH system is abnormal. The iH system will continue to operate.
•
If the sensor data is below the low alarm setpoint or above the high alarm setpoint, an alarm
condition exists. An alarm condition means there is a serious fault which results in the
shut-down of the iH system to prevent damage to the iH system. However, note that for some
of the alarm conditions, you may be able to continue to operate the iH system if you have
configured the iH system to 'run til crash': see Section 5.11.
If an alarm or warning condition exists, an appropriate alarm or warning message is
displayed on the Pump Display Terminal and an appropriate alarm or warning indication is
sent to other Modules on the network. Refer to Tables 6-1 and 6-2 for a full list of the Pump
Display Terminal warning and alarm messages.
You can use the default setpoints or you can use a Single Equipment Monitor to adjust the
setpoints to suit your application: refer to Section 5.3. Refer to Section 2 for the default
setpoints.
iH Dry Pumping Systems 1-21
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