BEKA BA368C, Руководство пользователя

Страница: 73 / 93

73
4.6.2 Alarm enable: ‘EnbL’
This function allows the alarm output to be enabled
or disabled without altering any other parameters.
To check or change the function select 'EnbL' from
the alarm menu and press
P which will reveal the
current setting. The function can be changed by
pressing the
Up or Down button followed by the E
button to return to the alarm menu.
4.6.3 Type of alarm: ‘tYPE’
The ‘tYPE’ function conditions the alarm to
operate from the speed or run-time displays.
To check or change the type of alarm, select 'tYPE'
from the alarm menu and press
P which will reveal
the current setting, ‘SPEEd’ or ‘hourS’. The
function can be changed by pressing the
Up or
Down button followed by the E button to return to
the alarm menu.
Note: When ‘tYPE’ is changed, the alarm
parameters are automatically set to the default
values and the alarm is disabled. It must therefore
be reprogrammed before use.
4.6.4 Setpoint adjustment: ‘SPS1’ or SPh1’
The setpoint, which is displayed in the units and
format selected when the instrument was
programmed, may be positioned anywhere in the
instrument display range. To adjust the setpoint of
alarm 1 select 'SPS1' or ‘SPh1’ from the main
menu. ‘SPS1’ is displayed when a speed alarm
has been selected and ‘SPh1’ when a run-time
alarm has been selected. Pressing
P will reveal
the existing setpoint value with one digit flashing.
Each digit may be adjusted using the
Up and
Down push-buttons and the P button will transfer
control to the next digit. When set as required,
pressing
E will return the display to the alarm
menu.
4.6.5 Alarm function: ‘HI.LO’
Each alarm may be conditioned as a high or low
alarm. To check or change the alarm function
select 'HI.LO' from the alarm menu and press
P to
reveal the current setting. The function can be
changed by pressing the
Up or Down buttons
followed by the E button to return to the alarm
menu.
4.6.6 Alarm output status: ‘no.nc’
The alarm output may be open or closed in the
non-alarm condition. When the BA368C power
supply is turned off or disconnected, both the
alarm outputs will open irrespective of whether
normally open or normally closed outputs have
been selected. Therefore an open output should
be the alarm condition for fail-safe operation.
To check the alarm output status select 'no.nc'
from the alarm menu and press
P to reveal the
current setting. The function can be changed by
pressing the
Up or Down button followed by the E
button to return to the alarm menu.
4.6.7 Hysteresis: ‘HStr’
Hysteresis is only available when the alarm has
been conditioned as a speed alarm. During
programming hysteresis is shown in the units that
the instrument has been calibrated to display.
To adjust the hysteresis, select 'HStr' from the
alarm menu and press
P to reveal the existing
figure. Each digit can be adjusted using the Up
and Down push-buttons. The P button transfers
control to the next digit. When the required
hysteresis has been entered, press
E to return to
the alarm menu.
e.g. When calibrated to display rotary speed with
a high alarm at 4000 and hysteresis of 100, the
alarm will perform as follows:
High alarm will be activated when speed
equals or exceeds 4000rpm, but will not
reset until the speed falls below 3900rpm.
4.6.8 Alarm delay: ‘dELA’
The alarm output may be delayed for a fixed time
following the alarm condition occurring. The delay
can be programmed in 1 second increments up to
3600 seconds. If a delay is not required zero
should be entered. To adjust the delay select
'dELA' from the alarm menu and press
P which will
reveal the existing delay time. Each digit of the
delay can be adjusted using the
Up and Down
push-buttons, and the P button to move to the
next digit. When the required delay has been
entered, press
E to return to the alarm menu.
The front panel alarm annunciator will start flashing
immediately an alarm occurs and continue for the
delay time after which the alarm output will be
activated.
4.6.9 Alarm silence time: ‘SIL’
This is primarily intended for use in small
installations where the alarm output directly
operates an annunciator such as a sounder.
When the alarm silence time is set to any figure
other than zero, the
P push-button becomes an
alarm accept button.
After an alarm has occurred, operating the P
button will cause the alarm output to revert to the
non-alarm condition for the programmed alarm
silence time.