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ACH550 BACnet User’s Manual 17

Diagnostics

• 5316 EFB PAR 16 (MS/TP token counter) advances for each token passed to this

drive.

Loss of Communication

The ACH550 behavior, if communication is lost, was configured earlier in

"Communication Fault" on page 14. The parameters are 3018

COMM FAULT FUNC and

3019

COMM FAULT TIME. The “Parameter Descriptions” section in the ACH550 User’s

Manual describes these parameters in detail.

No Master Station on Line

If no master station is on line: Neither 5306, EFB OK MESSAGES, nor the errors (5307

EFB CRC ERRORS and 5308 EFB UART ERRORS) increase on any of the stations.

To correct:

• Check that a network master is connected and properly programmed on the

network.

• Verify that the cable is connected, and is not cut or short circuited.

Duplicate Stations

If two or more stations have duplicate numbers:

• Two or more drives cannot be addressed.

• Every time there is a read or write to one particular station, the value for 5307 EFB

CRC ERRORS or 5308 EFB UART ERRORS advances.

To correct: Check all station numbers and edit conflicting values.

Swapped Wires

If the communication wires are swapped (terminal A on one drive is connected to

terminal B on another):

• The value of 5306 EFB OK MESSAGES does not advance.

• The values of 5307 EFB CRC ERRORS and 5308 EFB UART ERRORS are advancing.

To correct: Check that the RS-485 lines are not swapped.

Fault 28 – Serial 1 Err

If the drive’s control panel shows fault code 28 “SERIAL 1 ERR”, check for either of the

following:

• The master system is down. To correct, resolve problem with master system.

• The communication connection is bad. To correct, check communication

connection at the drive.

• The time-out selection for the drive is too short for the given installation. The

master is not polling the drive within the specified time-out delay. To correct,

increase the time set by parameter 3019

COMM FAULT TIME.

Faults 31 - EFB1

If the drive’s control panel shows fault code 31 “EFB1”, the drive has an invalid

object instance ID. To correct, use parameters 5311 and 5317 and establish a unique

drive ID that is in the range 1 to 4,194,303.