BEKA BA377E-SS, Manual

Page: 37 / 65

37
7.2 Controlling an IS solenoid valve
The BA377E-SS Timer is required to open an
intrinsically safe solenoid valve for 5 minutes when
an external contact is closed. 55 minutes after the
valve is closed it is to be opened again for another 5
minute period. This process is to be repeated 10
times after which the Timer is to automatically reset
so that is ready to start the next 10 cycles when the
external contact is closed.
In this example which is shown in Fig 19, control
output 2 has been wired to the timer reset terminals
and configured with a five seconds control output
delay after the solenoid valve has closed for the
tenth time. Therefore five seconds after the tenth
cycle has been completed the system automatically
resets and is ready for the next timing cycle to be
initiated.
The lower display is required to show timer status at
the start of each period.
After a power interruption the timer is required to
resume operation from the point at which it stopped
when the start button is operated.
Fig 19 Control of valve in a hazardous area
The required instrument configuration for this
example are shown below.
Function Display Setting
Access code
CodE 0000
Function
FunCtion ELAP5E
Input
input
Input
inP . type ContACt
Terminals 3 & 4 linked to energise input
Debounce
dEbounCE dEFAuLt
Display 2
di5P-2 5td
Start stop
5tAr5toP ControL 2
Units
unit5 12 : 00
Set time
5Et t 00 : 05
Timer repeat cycle
CYCLE5
Cycle function enable
EnbL on
Cycle count
cycl cnt 10
Reset delay
r5t dela 00 : 55
Access set time from
AC5Et - t oFF
display mode.
Direction of count
uP or dn uP
Power failure
p-fail pau5e
Local reset
loc r5et
Local total reset
r5Et . EnbL on
Local grand total reset
CLr Gtot oFF
Output 1
op 1
Enable control output 1
EnbL on
Control output 1 on at
oP1 on run
Control output 1 off at
oP1 oFF n run
Control output 1 delay
oP1 dELA 00000
Output 2
op 2
Enable control output 2
EnbL on
Control output 2 on at
oP2 on done
Control output 2 off at
oP2 oFF re5et
Control output 2 delay
oP2 dELA 00005
In this example local total reset
rE5Et . EnbL
is
on
.
This enables the Timer to be reset when power is
first connected by operating the
*
and
&
down
button simultaneously for more than 3 seconds.