TOHO ELECTRONICS TTM200 - Manual (Page 242)

48-7009-E 7-11
7.4 Troubleshooting
Check corresponding items listed below to abnormal operation of this product before requesting for a repair.
In case of no normal operation restored, contact TOHO’s sales department to return the product for a repair.
Symptom Description Check item
Too much
difference of
temperatures (1) Input type does not match the one of the main
frame.
(2) Resistance temperature detector is not
properly connected.
(3) Resistance temperature detector is
disconnected or shorted.
(4) The product is affected by noise from the
power line due to wires for lead and power
supply being laid in the same tubing.
(5) Copper wire is used for connecting this
product with thermocouple.
(6) Input compensation (PV compensation) is not
properly set.
Setting at factory shipment is “0 °C.”
(1) Check the sensor type and properly set the
input type on the main frame.
(2) Check the mounting location and polarity of
the resistance temperature detector to
properly connect it.
(3) Check the resistance temperature detector for
disconnection or short.
(4) Separately wire them.
(5) Connect lead wires of the thermocouple
directly to the product or use compensated
leads suited for the thermocouple.
(6) Enter the appropriate value for the input
compensation value.
No communication
possible (1) Inappropriate communication software
(2) Use of non-recommended converter
(1) Check the software protocol for
inappropriateness.
(2) Check connection devices for abnormality.
No output
provided (no
turn-on) (1) Control mode is set for READY.
At factory shipment, the setting is RUN.
(2) Target control operation is not set.
At factory shipment, the setting is “reverse
operation.”
(3) Too large a sensitivity value is set for the
ON/OFF operation.
At factory shipment, the set ting is “1.0 °C.”
(4) The setting is “control stop” due to assignment
of the function key for “control start/stop.”
(5) Setting value is set with incorrect decimal
point position without noticing the position
being shown as “0.0.”
(1) Set the control mode to RUN in the setting
mode of SET 4, item 5. Currently, display
lamp is lighting as RDY, indicating the state of
control stop.
(2) Check the settings of “reverse operation
(heating)” and “forward operation (cooling).”
(3) Set an appropriate value for the adjustment
sensitivity.
(4) Have the state of control start by a single
press of the FUNC key.
(5) Check settings of the decimal point position
and value.
No rise in
temperature (1) Target control operation is not set.
At factory ship ment, the setting is “reverse
operation.”
(2) Heater is disconnected or deteriorated.
(3) Insufficient capacity of heater.
(4) Cooling is operating.
(5) An overheat protector for a peripheral device
is operating.
(1) Check the settings of “reverse operation
(heating)” and “forward operation (cooling).”
(2) Check the heater for disconnection or
deterioration. Consider the use of heater
disconnection alarm (option) to detect
abnormality.
(3) Check that the heater has a sufficient heating
capacity.
(4) Check the operation for cooling being
effective.
(5) Set the temperature setting of the overheat
protector higher than that of this product.