User manual

1 Publication 1760-UM001D-EN-P - September 2005
Chapter 10
Troubleshoot Your Controller
You may sometimes find that Pico does not do exactly what you
expect. If this happens, read through the following notes which are
intended to help you solve some of the problems you may encounter.
Use the power flow display in Pico to check the logic operations in
the Pico circuit diagrams with reference to the switching states of
contacts and relays.
Only qualified persons should test Pico voltages while the device is in
operation.
Messages from the Pico
System
Pico System Messages on
the LCD
Explanation Remedy
No display Power interrupted Turn on the power.
Pico LCD faulty Replace the Pico.
Continuous display
TEST: AC Self-test aborted Replace the Pico.
TEST: EEPROM
TEST: DISPLAY
TEST: CLOCK
ERROR: I2C Memory module removed or not
inserted correctly before saving
Insert the memory
module.
Memory module faulty Replace the memory
module.
Pico is faulty Replace the Pico.
ERROR: EEPROM The memory for storing the
retentive values or the Pico circuit
diagram memory is faulty.
Replace the Pico.
ERROR: CLOCK Clock error Replace the Pico.
ERROR: LCD LCD is faulty Replace the Pico.
ERROR: ACLOW Incorrect ac voltage Test the voltage.
Pico is faulty Replace the Pico.