Filter
Top Products
M102E/M501 TRS TROUBLESHOOTING & REPAIR
(Addendum to M101E Manual - P/N 04740 Rev A)
10.2. M501-TRS Trouble shooting
10.2.1. TRS Converter Not Heating:
Problems with heating the If the TRS converter oven can have several causes.
• The “UUUU” error code will is displayed on the M501-TRS temperature controller display
indicating a problem with the thermocouple
• Check the resistance across the thermocouple leads for opens or shorts.
• Check to make sure that the thermocouple leads are securely connected to the wiring
block at the back of the controller.
• Make sure that the wiring block/socket is correctly plugged onto socket on the back pf
the controller.
• The set point for the process
value is set incorrectly.
• Check the set value; if it is incorrect, reset it.
• The controller is not in operational mode.
• Press the PV/SV switch to return it to operation mode.
• The heater is malfunctioning.
CAUTION
Make sure the M501-TRS is turned off and no AC power is being supplied
to the heater before proceeding.
• Check the resistance across the heater coil. It should be approximately 16.5 ohms.
• Check the wiring between the heater and the power supply.
• Check to make sure the M501-TRS cooling fan is operating properly and that the
instrument is properly ventilated. Poor ventilation can cause the M501-TRS’ thermal
switch to turn off the converter to prevent overheating.
• Check to make sure that the thermal switch and heater control relay are operating
properly.
10.3. Other Performance Problems
10.3.1. Excessive noise
In addition to the causes listed in Section 11.4.1 of the M101E Manual (P/N 04740 Rev A), an
excessively noisy TRS measurement can be caused by hysteresis or fluctuations in the
temperature of the TRS converter oven in the M501-TRS. If this is the case, perform the autotune
procedure described in Section 6.4. of this addendum.
05514 Rev A1 53