80
c
HAPTER
5:
Advanced Operation
Model 336 Temperature Controller
5.7 Alarms and
Relays
5.7.1 Alarms
Each input of the Model 336 has high and low alarm capability. Input reading data
from any source can be compared to the alarm setpoint values. A reading higher than
the high alarm setpoint triggers the high alarm for that input. A reading lower than
the low alarm setpoint triggers the low alarm for that input.
Menu Navigation:
Alarm
Q
Input
(
A, B, C, D
)
Q
Alarm
Q
(Off, On)
Alarm
Q
Input
(
A, B, C, D
)
Q
Low Setpoint
Q
(see note below)
Alarm
Q
Input
(
A, B, C, D
)
Q
High Setpoint
Q
(see note below)
Low and High Setpoint limits are determined by the Preferred Units of the associated sen-
sor input.
Defaults:
Alarm
Q
Off
Low Setpoint
Q
0.0000 K
High Setpoint
Q
1000 K
Interface Command:
ALARM
5.7.1.1 Alarm Annunciators
The Alarm LED annunciator steadily displays when any alarm that is enabled also has
the Visible parameter enabled. The annunciator flashes when any alarm that has the
Visible parameter enabled activates. An input need not be displayed for the system
Alarm annunciator to indicate input alarm status, but if the input is displayed on the
front panel, then the reading will alternate between the alarm status message and
the actual reading. If the Audible parameter is set to On for an enabled alarm, then
the beeper inside the instrument will sound when the alarm activates. The two relays
on the Model 336 can also be tied to alarm functions as described in section 5.7.2.
You may want to set the Visible parameter to Off if there is no need for showing the
alarm state on the front panel, for instance, if you are using the alarm function to trig-
ger a relay. The Audible parameter can be set to Off as well to keep the audible alarm
from sounding when an alarm is triggered.
Menu Navigation:
Alarm
Q
Input
(
A, B, C, D
)
Q
Visible
Q
(Off, On)
Alarm
Q
Input
(
A, B, C, D
)
Q
Audible
Q
(Off, On)
Default:
Visible
Q
On
Audible
Q
On
Interface Command:
ALARM
5.7.1.2 Alarm Latching
D
Latching Alarms
: often used to detect faults in a system or experiment that
requires operator intervention. The alarm state remains visible to the operator
for diagnostics even if the alarm condition is removed. Relays often signal remote
monitors, or for added safety take critical equipment off line. You can clear a
latched alarm by pressing
Alarm
and selecting Yes to the Reset Alarm prompt.
Select No to the Reset Alarm prompt to enter the Alarm Setup menu.
D
Non-Latching Alarms
: often tied to relay operation to control part of a system or
experiment. The alarm state follows the reading value. The dead band parameter
can prevent relays from turning on and off repeatedly when the sensor input
reading is near an alarm setpoint.
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Страница 26: ...14 cHAPTER 1 Introduction Model 336 Temperature Controller...
Страница 54: ...42 cHAPTER 3 Installation Model 336 Temperature Controller...
Страница 84: ...72 cHAPTER 4 Operation Model 336 Temperature Controller...
Страница 104: ...92 cHAPTER 5 Advanced Operation Model 336 Temperature Controller...
Страница 164: ...152 cHAPTER 7 Options and Accessories Model 336 Temperature Controller...
Страница 178: ...166 cHAPTER 8 Service Model 336 Temperature Controller...