Omron E5CN User Manual page 288

Timing Status
During opera- Output will not turn
tion (continued) ON
Temperature Con-
troller will not oper-
ate
Temperature error is
large
Input error (S.err dis-
play)
Keys will not operate Setting change pro-
Cannot shift levels
After long ser- Control is unstable
vice life
Note The tightening torque for E5CN-U is 0.5 N·m.
Meaning
Set to STOP Set the RUN/STOP mode to RUN. If STOP
(default: RUN) is lit on the display, control is stopped.
Specified operation Select either forward or reverse operation
is unsuitable for depending on the required control. Reverse
required control operation is used for heating operations.
(default: Reverse
operation)
A high hysteresis is Set a suitable value for the hysteresis.
set for ON/OFF oper-
ation (default: 1.0°C)
Set to STOP Set the RUN/STOP mode to RUN. If STOP
(default: RUN) is lit on the display, control is stopped.
Thermometer has Check whether the thermometer has burnt
burnt out or short-cir- out or short-circuited
cuited.
Thermometer lead Wire the lead wires and power lines in sep-
wires and power arate conduits, or wiring using a more direct
lines are in the same path.
conduit, causing
noise from the power
lines (generally, dis-
play values will be
unstable).
Connection between Connect the thermocouple's lead wires
the Temperature directly, or connect a compensating conduc-
Controller and ther- tor suitable for the thermocouple.
mocouple is using
copper wires.
Installation location Check whether the location of the thermom-
of thermometer is eter is suitable.
unsuitable.
Input shift is not set Set a suitable input shift. If input shift is not
correctly (default: required, set the input shift value to 3.
0°C)
Turn OFF setting change protect.
tect is ON.
Operations limited Set the operation/adjustment protect, initial
due to protection. setting/communications protect, and set-
ting change protect values as required.
Terminal screws may Retighten terminal screws to a torque of
be loose.
0.74 to 0.90 N
The internal compo- The Temperature Controller's internal elec-
nents have reached trolytic capacitor depends on the ambient
the end of their ser- temperature, and load rate. The structural
vice life. life depends on the ambient environment
(shock, vibration). The life expectancy of the
output relays varies greatly with the switch-
ing capacity and other switching conditions.
Always use the output relays within their
rated load and electrical life expectancy. If
an output relay is used beyond its life
expectancy, its contacts may become
welded or burned. Replace the Temperature
Controller and all other Temperature Con-
trollers purchased in the same time period.
Countermeasures
·
m (see note).
Appendix
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156
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