AEC AP Series Large Dehumidifying Dryer - Manual (Page 83)

Large Dehumidifying Dryers Controls 82
DeviceNet I/O Faults 10
The drying hoppers DeviceNet inputs and outputs reside in the drying hopper control box
located on the drying hopper stand. All the diagnostics lamps on the I/O assembly will
normally be green. Any other indications signify a fault condition.
The assembly is divided into the communications slave unit at the left most position with
the physical inputs and outputs following to the right.
The slave unit’s lamps reflect the status of DeviceNet communications (MD & NT), the
operational state of the slave (RUN) and the condition of the power (UM & US).
The input and output devices ‘D’ lamps reflect the running status of the individual I/O slices.
All other lamps on these units show the ON/OFF state of the input or output.
Call ACS service if there is a suspected failure of the drying hopper I/O. Note what
diagnostics lamps are ON (GREEN)/OFF or RED.
Touch Screen Faults
Normally, very little can go wrong with the touch screen(s). The green RUN lamp should
always be ON.
Virtually all significant errors can be traced to failed communications between the touch
screen(s). In the event of an error, ensure that the communications cable is properly
connected and that the PLC and touch screen are power on. The touch screen(s) will
automatically resume functioning once the cause of the fault has been isolated and corrected.
Note that no pertinent system data is stored in the touch screen at any time.
10 Ref: Phoenix Inline DeviceNet Bus Coupler User Manual 1436c_e
Ref: Phoenix Inline 24VDC Digital Input 6842a_gb
Ref: Phoenix Inline 24VDC Digital Output 6843b_gb
Ref: Phoenix Inline Thermocouple 5722b_gb