Eaton TC 48, User Manual

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The controller has one alarm output. There are 6 alarm functions
and one dwell timer that can be selected, and four kinds of alarm
modes ( ALMD ) are available for each alarm function ( ALFN ).
Besides the alarm output, the output 2 can also be configured as
another alarm. But output 2 only provides 4 kinds of alarm functions
and only normal alarm mode is avaiable for this alarm.
A process alarm sets two absolute trigger levels. When the process
goes higher than SP3, a process high alarm ( PV.HI ) occurs, and the
alarm turns off as the process goes lower than SP3-ALHY. When the
process goes lower than SP3, a process low alarm ( PV.LO ) occurs
and the alarm turns off as the process is higher than SP3+ALHY.
A process alarm is independent of set point. A sets two absolute trigger levels. When the process
goes higher than SP3, a process high alarm occurs, and the
alarm turns off as the process goes lower than SP3-ALHY. When the
process goes lower than SP3, a process low alarm
occurs
and the alarm turns off as the process is higher than SP3+ALHY.
A process alarm is independent of set point.
process alarm
( PV.HI )
( PV.LO )
A deviation alarm alerts the user when the process deviates too far
from set point. When the process goes higher than SV+SP3, a
deviation high alarm (DE.HI) occurs and the alarm turns off as the
process goes lower than SV+SP3-ALHY. When the process goes lower
than SV+SP3, a deviation low alarm (DE.LO) occurs and the alarm
turns off as the process goes higher than SV+SP3+ALHY. Trigger level
of deviation alarm is moving with set point. A alerts the user when the process deviates too far
from set point. When the process goes higher than SV+SP3, a
deviation high alarm
occurs and the alarm turns off as the
process goes lower than SV+SP3-ALHY. When the process goes lower
than SV+SP3, a deviation low alarm
occurs and the alarm
turns off as the process goes higher than SV+SP3+ALHY. Trigger level
of deviation alarm is moving with set point.
deviation alarm
(DE.HI)
(DE.LO)
A deviation band alarm presets two trigger levels relative to set point.
The two trigger levels are SV+SP3 and SV - SP3 for alarm. When the
process is higher than ( SV+SP3 ) or lower than ( SV - SP3 ), a
deviation band high alarm ( DB.HI ) occurs. When the process is within
the trigger levels, a deviation band low alarm (DB.LO) occurs. A presets two trigger levels relative to set point.
The two trigger levels are and for alarm. When the
process is higher than ( SV+SP3 ) or lower than ( SV - SP3 ), a
deviation band high alarm
occurs. When the process is within
the trigger levels, a deviation band low alarm occurs.
deviation band alarm
SV+SP3 SV - SP3
( DB.HI )
(DB.LO)
There are four types of alarm modes available for each alarm function,
these are: Normal alarm, Latching alarm, Holding alarm and Latching/
Holding alarm. They are described as follows: There are four types of alarm modes available for each alarm function,
these are: Normal alarm, Latching alarm, Holding alarm and Latching/
Holding alarm. They are described as follows:
In the above descriptions SV denotes the current set point value for
control which is different from SP1 as the ramp function is performed. In the above descriptions denotes the current set point value for
control which is different from SP1 as the ramp function is performed.
SV
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