Chromalox 2104 User Manual

56 Chromalox 2104 Technical Manual
Probable Cause Control Output Response Display
Controller or remote power Turns control output off
control output fails (open circuit)
If the controller output or the remote power control device (SCR or contactor) fails open,
the Loop Alarm will be activated when the process variable goes outside of the
proportional band for a time greater than the preset Loop Timer value. The failure will be
indicated by the lower display flashing LOOP. Loop Alarm Output (Output #3, #4, or #5)
will be activated if selected.
Probable Cause Control Output Response Display
Controller or remote power None
control output fails (short circuit) (load must be interconnected with alarm)
If the controller output or the remote power control device (SCR or contactor) fails
shorted, the Loop Alarm will be activated when the process variable goes outside of the
proportional band for a time greater than the preset Loop Timer value. The failure will be
indicated by the lower display flashing LOOP. Loop Alarm Output (Output #3, #4, or #5)
will be activated. To protect the loop under this condition, the Loop Alarm Output (Output
#3, #4 of #5) should be interconnected to remove power from the load.
Probable Cause Control Output Response Display
Sensor wiring reversed Turns control output off
(thermocouple only)
If the sensor wiring is reversed, the Loop Alarm will be activated when the process variable
goes outside of the proportional band for a time greater than the preset Loop Timer value.
The control output will be turned off and the failure will be indicated by the lower display
flashing LOOP. Loop Alarm Output (Output #3, #4, or #5) will be activated if selected.
Probable Cause Control Output Response Display
Sensor loses contact Turns control output off
with process
If the sensor loses contact with the process (sensor becomes dislodged or pulled loose),
the Loop Alarm will be activated when the process variable goes outside of the
proportional band for a time greater than the preset Loop Timer value. The failure will be
indicated by the lower display flashing LOOP. Loop Alarm Output (Output #3, #4, or #5)
will be activated if selected.
Probable Cause Control Output Response Display
Sensor fails (open circuit) Defaults to preset (0-100%)
If the sensing device fails open, the controller defaults to the preset output condition
(0-100% ORNG setting selected on the CTRL PAGE menu) and uses both displays to
indicate OPEN SENS. The Loop alarm is not activated for this condition. Alarms selected
as Low, High-Low, + Deviation or +/- Deviation will actuate if selected.
Figure 6.1 CLP Loop Alarm Conditions (continued)
LL
LL
L
OOOO
OOOO
OO
PP
PP
P
88888888
88888888
8888
Flashing
(continued on the next page)
LL
LL
L
OOPOOP
OOPOOP
OOP
88888888
88888888
8888
Flashing
LL
LL
L
OOPOOP
OOPOOP
OOP
88888888
88888888
8888
Flashing
LL
LL
L
OOPOOP
OOPOOP
OOP
Flashing
88888888
88888888
8888
SENSSENS
SENSSENS
SENS
OPENOPEN
OPENOPEN
OPEN
Flashing

Chromalox 2104 Specifications

General

Brand	Chromalox
Model	2104
Category	Temperature Controller
Language	English