Alarms - Fema Electronica B Series User Manual

FEMA ELECTRÓNICA . SERIES B . Models Bxx-C1

1.13.15 Alarms

The instrument manages 3 independent internal alarms,
each one controlling the activation of an optional relay,
transistor or control SSR output.
Optional modules (see section 2) are installed at the free
slots inside the instrument (see section 1.4). B24 and B44
formats have 2 free slots for output and control modules,
while B26 and B46 formats have 3 free slots for output
and control modules.
The instrument has 3 front leds that reflect the state of
the 3 internal alarms. These leds are only for local help
during installation, as they are not appropriate for long
distance reading.
Each alarm controls the activation of the relay, transis-
tor or control SSR installed on its associated slot, and the
front led.
• Configurable parameters
Each alarm has several parameters for configuration,
starting with the usual setpoint, hysteresis and maxi-
mum (alarm active when reading is higher than setpoint)
or minimum (alarm active when reading is lower than
minimum) alarm types (see Figure 7).
Reading
on
off
on
off
activation
delay
on
off
Figure 7 - Example for alarm with 2 setpoint
18
setpoint
histéresis
t
Alarm as maximum, no
hysteresis, no delays
t
Alarm as maximum,
hysteresis and delays
deactivation t
delay
Alarm as minimum, no
hysteresis, no delays
t
• Activation and deactivation delays
Each alarm can configure independent activation and
deactivation delays. These delays affect the alarm as a
whole, and the delay will affect the front led and the as-
sociated relay.
• Second setpoint
Configuring a second setpoint creates 'windowed
alarms'. The windowed alarm controls with a single relay
output if the reading is inside or outside the values de-
fined (see Figure 8).
• Inverted relay
Activate the 'inverted relay' function to invert the activa-
tion logic of the associated relay.
• 'Locked alarms'
Activate the 'locked alarms' function will force the op-
erator to interact with the instrument when an alarm
has been activated. Once activated, the alarm will re-
main locked at active state, even is the reading returns
to a value below setpoint, until the operator manually
unlocks the alarms pressing the front key 'LE' (or the re-
mote key 'LE', see section 3.1).
• 'On alarm' functions
The 'on alarm' functions allow to associate a function to
the alarm activation event. Functions available are re-
set to '0', load the preset value, or do nothing. Functions
reset and preset create counting cycles (from 0, then to
setpoint, then to 0 again, ...). The number of cycles per-
formed can be accessed through the fast access menu
(see section 1.13.17).
Reading
on
off
Figure 8 - Example for alarm with 2 setpoints
Setpoint 2
Setpoint 1
t
Alarm as minimum, with
double setpoint, no hyster-
esis, no delays
t