Diagnostics and Troubleshooting - User Interface

Bad I/O Channel Diagnostics

Below is a list of conditions that can cause a bad channel diagnostic. The associated function block’s I/O status will indicate the nature of the diagnostic described in the failure column.

Table 29 - Bad Channel Diagnostics

Module

Failure

Description

User Action

Type

 

 

 

 

 

 

 

 

 

AI

Burnout Failure

The sensor – T/C, RTD, or mV source --

 

1.Check terminal block

 

 

is failing burnout checks.

 

connections

 

 

 

 

2.Replace source

 

 

 

 

element

 

 

 

 

3.Replace card.

 

 

 

 

 

 

Under range

The signal at the terminals is less than

1.

Check the signal level

 

 

10% below the range of the sensor.

 

being applied to the

 

 

 

 

terminals.

 

 

 

2.

Replace card.

 

 

 

 

 

 

Over range

The signal at the terminals is more than

1.

Check the signal level

 

 

10% over the range of the sensor.

 

being applied to the

 

 

 

 

terminals.

 

 

 

2.

Replace card.

 

 

 

 

 

 

Failing to

When attempting to take a reading, the

1.

Check the signal level

 

convert

ADC fails. This could result if the

 

being applied to the

 

 

incoming signal is either too large or

 

terminals.

 

 

small. It also could result if the ADC

2.

Replace card.

 

 

circuit is failing. If the problem is the ADC

 

 

circuit, most likely other channels will

 

 

 

 

have the same failure.

 

 

 

 

 

 

 

AO

Channel

The board indicates that the channel is

1.

Check terminal

 

Failure

failing to output the correct value.

 

connections.

 

 

 

2.

Replace module.

 

 

 

 

 

134

HC900 Hybrid Controller Installation and User Guide

Revision 5

 

 

9/03

Page 144
Image 144
Honeywell HC900 manual Bad I/O Channel Diagnostics, Bad Channel Diagnostics

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