BEKA BA368E, Manual

Page: 37 / 57

To determine the maximum permissible cable
parameters Ci should be subtracted from the
maximum permitted external capacitance Co
specified by the certificate for the intrinsically safe
interface powering the alarm circuit, such as the
solenoid driver and switch transfer galvanic isolators
shown in Fig 15
Fig 15 Typical alarm application
10.3.3 Summary of configuration functions
When a BA368E Counter is supplied with alarms the
configuration menu is extended as shown in Fig 16.
The alarm functions appear after
LoC clr,
each
alarm may be configured to operate on the rate or
total display.
For simplicity Fig 16 only shows the configurable
functions on the rate option of alarm AL1, the total
option is identical except that the total alarms can
not have hysteresis. Configuration of alarm AL2 is
identical to alarm AL1.
The following table summarises each of the alarm
configuration functions and includes a cross
reference to more detailed information. Again only
the functions on alarm AL1 are listed.
Display Summary of function
EnbL
Alarm enable
Enables or disables the alarm without
changing the alarm parameters.
See section 10.3.4
tYPE
Type of alarm
Defines whether the alarm operates on
the rate or total display.
See section 10.3.5
5P1r
Alarm setpoint 1
or Adjusts the alarm setpoint. The
5P1t
alarm is activated when the rate or
total display equals the setpoint.
Note:
5P1r
is displayed for a rate alarm
and
5P1t
for a total alarm.
See section 10.3.6
HI. LO
Alarm function
Defines whether the alarm has a high or
low function.
See section 10.3.7
no . nc
Normally open or normally closed
output.
Determines whether the single pole
alarm output is open or closed in the
non-alarm condition.
See section 10.3.8
H5tr
Hysteresis
Adjusts the alarm hysteresis. Only
available on a rate alarm.
See section 10.3.9
dELA
Alarm delay time
Adjusts the delay between the display
equaling the setpoint and the alarm
output being activated.
See section 10.3.10
5IL
Alarm silence time
Defines the time that the alarm output
remains in the non-alarm condition
following acceptance of an alarm.
See section 10.3.11
FL5H
Flash display when alarm occurs
When enabled, alternates the rate or
total display between process value and
alarm reference
AL1
or
AL2
when an
alarm output is activated.
See section 10.3.12
AC5P
Access setpoint
Sub-menu that enables direct access to
the alarm setpoints from the display
mode and defines a separate security
code.
See section 10.3.13
37