AH500 Module Manual 5.1.12.2 Troubleshooting Procedure 5.2 AH08PTG-5A 5.2.1 Overview The specifications for a temperature measurement module, the operation, and the programming are described in this section. AH08PTG-5A is a temperature measurement module. It converts the temperatures received from its eight thermocouples into digital signals. Users can select the degree Celsius or the degree Fahrenheit as a unit of measurement for temperature. 5.2.2 Characteristics (1) A sensor is selected according to practical application. Pt100/Ni100/Pt1000/Ni1000 sensor (2) The channels in a module are isolated from one another. Every two channels in a module form a group. There are four groups.
The groups are isolated from one another by transformers. Every group has its independent power and analog-to-digital circuit. The speed at which the module converts analog signals into digital signals is increased. If a channel in a group is damaged, the operation of other channels will not be affected. The channels in a group are isolated from each other by an optocoupler. They do not form a circuit. (3) Conversion speed The two channels in a group convert the temperatures they receive into digital signals. A fast mode can only be applied to one of the channel in a group. If users want to use the fast mode, it is suggested that they should use a four-wire/two-wire configuration.
If a three-wire RTD is used in the quick mode, there will be a need for thermocouple compensating cables and reliability, and the conversion time required will be the same as that in a general mode. Quick mode: Four-wire/Two-wire configuration: 20 ms/channel Three-wire configuration: 200 ms/channel General mode: A conversion time will be gotten after the conversion time of the two channels in a group is added up. Two-wire/Four-wire configuration: 200 ms/channel Three-wire configuration: 400 ms/channel 5-38 Description Procedure Hardware failure Return the module to the factory for repair. The external voltage is abnormal.
Check whether the external 24 V power supply to the module is normal. Internal error The factory correction is abnormal. Please contact the factory. The signal received by channel 0 exceeds the range of inputs which can be received by the hardware. Check the signal received by channel 0. The signal received by channel 1 exceeds the range of inputs which can be received by the hardware. Check the signal received by channel 1 The signal received by channel 2 exceeds the range of inputs which can be received by the hardware. Check the signal received by channel 2. The signal received by channel 3 exceeds the range of inputs which can be received by the hardware.
Check the signal received by channel 3.