Watlow 8LS Controller - Manual (Page 127)

Appendix B: 8LS-CP
8LS User’s Guide 119
Setup Alarms
CP Gas Alarm
This menu is available from the Setup Alarms main menu. Use it to set
the digital output number for the CP trim gas alarm output. This output
is On when the temperature of the T/C Reference Loop is between 1400
to 2400ºF and Off when the temperature is outside these limits. When
setting it to 0, the CP GAS output is disabled.
Selectable Range: 1-30, or 0.
CP and DP Display
The display of the carbon probe loop process variable depends upon the
input values of the T/C Reference Loop and the probe millivolt level.
In order to display the engineering values of the input, both the T/C and
probe loops must be within limits of the carbon probe variables for
correct reading of the probe.
• If the CP loop is in automatic mode, an out of range reading will set
both CP control outputs to 0.
• If the control is in manual mode, it will not effect the outputs.
The next table shows the CP loop out of range indications.
Process condition Indication
Reference T/C is below 1400ºF LOT
Reference T/C is above 2400ºF HIT
Probe MV is below 960 MVDC LOV
Probe MV is above 1275 MVDC HIV
1 2 3 4 5 6 7 8
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUTPUT%
2CP GAS
OUTPN? 0
1 2 3 4 5 6 7 8
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUTPUT%
2 HIT %CP
. 25 M 0