Table of Contents
Advertisement
16.8 Black box for event log
Through the "Service" software, the application software allows displaying the event log, with the possibility of graphically
representing the events stored by the controller.
The controller stores the following variables. If present and enabled, depending on the type of machine.
Variable
Temperature active setpoint
Heating temperature active
setpoint
Free Cooling Temperature
External Temperature
Differential air pressure
Air flow
Room temperature
Ambient humidity
Delivery temperature
Circuit 1 low pressure
Circuit 2 low pressure
Resistance step demanded
Unit status
Fan status
Dehumidification status
Humidifier status
Unit operation mode
Fan speed
Free Cooling damper opening
Cooling ramp
INFORMATION:
The black box for Historical Events is only available by connecting the controller with "Service" software.
Whenever an event (Signal or Alarm) is activated, the controller stores the variable mentioned above for each event 10 minutes
preceding the event itself (a value every 30 seconds).
The following black box variables have been codified according to a logic defined by MEHITS. Their meanings are described
below.
The Unit status variable can have the following meaning:
This variable is calculated according to a predetermined priority defined during the creation of the software and can not be
changed.
Version 38
Cooling setpoint active.
Heating active setpoint.
Not used.
Value read by the External air temperature probe.
Value read by the differential air pressure transducer (only in units with constant DeltaP control).
Estimated current air flow value (only in units with constant flow control).
Value read by the Ambient air temperature probe.
Value read by the ambient air humidity probe.
Value read by the Delivery air Temperature probe.
Value read by the circuit 1 low pressure transducer.
Value read by the circuit 2 low pressure transducer.
Number of cooling steps required.
Unit status.
Fan status.
Dehumidification status (bit–coded value).
Humidifier status.
Unit operation mode.
Fan speed expressed in %.
Opening of Free Cooling damper, if present, expressed in %.
Demand of the room for the cold resource in %.
0
Unit switched on from keyboard.
1
Unit switched on from remote digital contact.
2
Unit switched on from pLAN.
3
Unit switched on from time bands.
4
Unit switched on from supervision.
5
Unit switched off by an alarm.
6
Unit switched off from supervision.
7
Unit switched off from time bands.
8
Unit switched off from pLAN.
9
Unit switched off from remote digital contact.
10
Unit switched off from keyboard.
12
Unit switching off.
Description
184
Advertisement
Table of Contents
