Specifications

VersaPro Temperature Controller Page 16
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6.9 Direct or Reverse Control Action
Control action determines how the output of the controller will react to effect a change on the process. The
control action is considered ‘direct’ if an increase in the output produces an increase in the process value. A
‘reverse’ control action would be when an increase in the output produces a decrease in the process.
For example oxygen would require a reverse acting control if the process component the instrument is
controlling is a trim gas. Increasing the trim gas will result in a decrease in the oxygen reading. It is
considered a direct acting control if the process component under control is additional air. Either process
would use the first control contact; it would just be activated above or below the process setpoint depending on
what is being added to the process.
7 Alarms
The instrument has two types of alarms, process alarms and diagnostic alarms. If an alarm has been selected
and conditions are such that the alarm becomes active, the instrument will display this condition on the center
LCD display. The alarms a numbered as Alarm 1 and Alarm 2. The various displays for active alarm
conditions would be displayed as shown below. N indicates the position of the alarm number, 1 or 2.
ALARM DISPLAY CONDITION ACTION
PROCESS HIGH Process alarm, contact assignable Full Scale High, Contact
automatically resets unless latched.
PROCESS LOW Process alarm, contact assignable Full Scale Low, Contact automatically
resets unless latched.
PROCESS HIGH OR LOW Process alarm, contact assignable Deviation Band,
Contact automatically resets unless
latched.
PROCESS HIGH Process alarm, contact assignable Deviation High, Contact automatically
resets unless latched.
PROCESS LOW Process alarm, contact assignable Deviation Low, Contact automatically
resets unless latched.
PROCESS HIGH Process alarm, contact assignable Power Output High, Contact
automatically resets unless latched.
PROCESS LOW Process alarm, contact assignable Power Output Low, Contact
automatically resets unless latched.
TIMER END Alarm contact assigned to TinE,
Strt, SOAK
Timer end alarm when the timer
counts to zero for Timer, Start, or
Soak timer modes. The contact
latches until reset by pressing the
Enter key or through the Input Event.
LLLL Display only Displays process value within display
range or exponent setting
HHHH Display only Displays process value within display
range or exponent setting
FLASH CSUM Fault alarm, contact assignable Reset instrument power. Return to
Marathon if error does not clear.
EEPROM CSUM Fault alarm, contact assignable Reset instrument power. Return to
Marathon if error does not clear.
KEYBOARD Fault alarm, contact assignable Reset instrument power. Do not push
any keys while instrument is powered
on. Return to Marathon if error does