Dynisco ATC770, Installation And Operation Manual

Page: 36 / 88

36
6.1.5 S
ETTING THE
P
RIMARY
I
NPUT
L
OW
-S
CALE
V
ALUE
For applications where a low scale value is non-zero, the Instrument can provide a low scale value
of
± 25% of the full scale value.
To set the low-scale value, press the
FUNC
key until nonE and GROUP show on the display. Press
the
▲
key until 3 shows in the upper display. Press the
FUNC
key and the upper display will show a
value while the lower display shows
PI.FSV. Press the
FUNC key and the upper display will show
0
while the lower display shows PI.LSV. Hold the
▼
or
▲
key until the upper display changes to
whatever the low-scale value of the primary input may be. Press the
FUNC
key to set the value.
Finally, press the
A/M
key to go back to the active display.
6.1.6 S
ETTING THE
P
RIMARY
I
NPUT
D
ECIMAL
P
LACE
To set the decimal place, press the
FUNC
key until nonE and GROUP show on the display. Press the
▲
key until 3 shows in the upper display. Press the
FUNC
key until the lower display shows PI.DP.
Press the
▼
or
▲
key until the upper display shows the correct decimal place location. For example,
a 350 Bar unit may show 350.0 for decimal place setting. Press the
FUNC
key to set the value.
Finally, press the
A/M
key to go back to the active display.
6.1.7 S
ETTING THE
P
RIMARY
I
NPUT
F
AILSAFE
M
ODE
The Primary Input Failsafe Mode is nothing more than a safety mechanism that tells the instrument
what to do in the event of a loss of the primary signal. If the system is set up to shut down the
process in a high alarm condition, the Primary Input Failsafe parameter can set the value of the
primary input to full scale if it looses the primary signal. If the system is set up to shut down the
process in a low alarm condition, the Primary Input Failsafe parameter may set the value of the
primary input to low scale if it looses the primary signal. The default Primary Input Failsafe Mode is
to set the value to full scale high.
To set the Primary Input Failsafe Mode, press the FUNC key until
nonE and GROUP show on the
display. Press the
▲
key until 4 shows in the upper display. Press the
FUNC
key until the lower
display shows PI.IFS. Press the
▼
or
▲
key until the upper display shows the correct mode, either
HI or Lo. Press the
FUNC
key to set the value. Finally, press the
A/M
key to go back to the active
display.
6.2 S
ETTING THE
A
LARMS
All Alarms supplied with the Instrument can be linked to the actual pressure value, a pre-selected
band about that pressure value, deviation from setpoint, or turned off. The alarms are capable of
being set as High Level Alarms or Low Level Alarms, and may operate in either
Failsafe or Direct
condition.
Failsafe means that in the event of power failure to the Instrument, the Alarm will activate. Use this
feature on a shutdown alarm. Please note that in a proper operating condition in Failsafe mode, the