Temperature Controller

E5CS--X

A--151

Precautions

The E5CS-X temperature controller has self-diagnostic functions that display the following error messages to simplify troubleshooting.

Message

Cause

Control output

fff

(1) Temperature has risen beyond temperature scale range

(2) Thermistor has been short-circuited

OFF during heating (reverse) operation

ON during cooling (normal) operation

---

(1) Temperature has fallen below temperature scale range

(2) Thermistor has broken

ON during heating (reverse) operation

OFF during cooling (normal) operation

(2) Temperature has risen much beyond scale range

OFF

(2) Polarities (positive and negative) of thermocouple are reversed

(3) Temperature has fallen much below scale range

OFF

(2) Analog-to-digital converter failure (E33) display

Temperature controller must be repaired if recovery is not made

by turning power off once and on again.

Both control outputs and the alarm output

are OFF

Note: *Key operations are disabled.

When the alarm outputs are used, an alarm output occurs when the “FFF” and “------” messages appear in the display. These dis-

plays indicate when the temperature has risen beyond or fallen below the temperature scale range.

J Sensor Failure Indication

Condition

Display

Control output

Thermocouple sensor

Break in sensor

OFF

Short-circuit

Ambient temperature

OFF

Platinum RTD sensor

Break in sensor

OFF

OFF

Disconnection of two or three wires

OFF

Short-circuit

OFF

Thermistor sensor

Break in sensor

---

ON during heating (reverse) action

OFF during cooling (normal) action

Short-circuit

fff

ON during heating (reverse) action

OFF during cooling (normal) action

Note: The resistance of the platinum RTD is 100

Ω at 0°C and increases to 140 Ω at 100°C.