A - 23
A Appendices
E5@C Digital Temperature Controllers User’s Manual (H174)
A-5 Troubleshooting
A
A-5-2 Checking Problems
*2 The specified torque is 0.5 N·m for the E5CC-U.
Timing Status Meaning Countermeasures Page
During
operation
(continued)
Output will not turn ON Set to STOP (default:
RUN)
Set the RUN/STOP mode to RUN. If STOP is lit on the
display, control is stopped.
5-12
Specified operation is
unsuitable for required
control (default: Reverse
operation).
Select either forward or reverse operation depending on
the required control. Reverse operation is used for heating
operations.
4-15
A high hysteresis is set
for ON/OFF operation
(default: 1.0°C)
Set a suitable value for the hysteresis. 4-21
The specified power is
not being supplied from
the terminals.
The output will not turn ON while the Digital Controller is
being operated with power supplied through the
USB-Serial Conversion Cable. Supply the specified power
from the terminals.
---
Digital Controller will not
operate
Set to STOP (default:
RUN)
Set the RUN/STOP mode to RUN. If STOP is lit on the
display, control is stopped.
5-12
Temperature error is large
Input error (S.err display)
Thermometer has burnt
out or short-circuited.
Check whether the thermometer has burnt out or
short-circuited.
---
Thermometer lead wires
and power lines are in the
same conduit, causing
noise from the power
lines (generally, display
values will be unstable).
Wire the lead wires and power lines in separate conduits,
or wire them using a more direct path.
---
Connection between the
Digital Controller and
thermocouple is using
copper wires.
Connect the thermocouple’s lead wires directly, or connect
compensating conductors that are suitable for the
thermocouple.
---
Installation location of
thermometer is
unsuitable.
Make sure that the location that is being measured with
the temperature sensor is suitable.
---
Input shift is not set
correctly (default: 0°C)
Set a suitable input shift. If input shift is not required, set
the input shift value to 0.0.
5-3
Keys will not operate Setting change protect is
ON.
Turn OFF setting change protect. 5-19
Cannot shift levels Operations limited due to
protection.
Set the operation/adjustment protect, initial
setting/communications protect, and setting change
protect values as required.
5-19
After long
service life
Control is unstable Terminal screws may be
loose.
Retighten terminal screws to a torque of 0.43 to 0.58
N·m.*
2
2-55
The internal components
have reached the end of
their service life.
The Digital Controller's internal electrolytic capacitor
depends on the ambient temperature, and load rate. The
structural life depends on the ambient environment
(shock, vibration). The life expectancy of the output relays
varies greatly with the switching 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 Digital Controller
and all other Digital Controllers purchased in the same
time period.
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