Ferroli RMA series, Инструкция по установке и эксплуатации

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32
CONTROL SYSTEM
Alarm activation and reset
The controller can perform a complete diagnosis of the unit, detecting all the operating faults and reporting a set of alarms.
Activation of an alarm involves :
• locking of the loads concerned
• reporting of the alarm code on the display (in case of simultaneous alarms the one with the lowest index is displayed whereas the
complete list of active alarms can be shown by accessing the “Status \ AL” menu)
• recording of the event in the alarms memory
Alarms that can damage the unit or the plant require a manual reset that implies an action by the operator to reset the controller
(pressing the UP and DOWN buttons at the same time). It is reccomended to carefully check the cause of the alarm and make sure
the problem is eliminated before restarting the unit. In any case the unit restarts only if the cause of the alarm has disappeared.
Less critical alarms are automatically reset . As soon as the cause of the alarm is eliminated the unit starts working again and the
alarm code disappears from the display. Some of these alarms require a manual reset if the number of events per hour exceeds a
fixed limit.
Pressing any button it's possible to deactivate the alarm : alarm report disappears from the display, the alarm LED starts flashing
and the Alarm digital output is disabled. The deactivation of the alarm does not affect the alarm in progress.
Number of events per hour
For some alarms the number of events per hour is recorded : if, in the last hour, the number of events reaches a fixed limit, the alarm
reset change from automatic to manual.
Sampling of alarms occurs every 112 seconds. If an alarm is activated several times in a sampling period (112 seconds) it is counted
only once.
Esempio. If the fixed limit of events per hour is 3, in order to change from automatic to manual reset, tha alarm has to remain active
for a period of time between 2*112 seconds and 3*112 seconds.
Campionamento
allarmi
112 s 112 s 112 s 112 s
Riarmo Manuale Riarmo Automatico
Tempo
1 2 3 Conteggio
Allarme
Alarms memory
The controller enables the recording of the alarms occurred during the unit operation (up to a maximum 99 events). The following
informations are recorded for each event :
• alarm code
• activation time
• activation date
• deactivation time
• deactivation date
• type of alarm (automatic or manual reset)
Such informations can be shown by accessing the “Programming \
EU
” menu.
When the number of events recorded is higher than 99 the following events are recorded overwriting the oldest alarms.
The alarms memory can be cancelled by means of the
Evr
function available inside the “Programming \
FnC
” menu, keeping pressed
the SET button till
YES
appears on the display.
Alarms
Automatic reset Manual reset
Alarm
Counter
Timer
Alarm
sampling