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Eq5 ac drive operations manual – HP Anab EQ5 User Manual

Page 125

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EQ5 AC Drive Operations Manual

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TECO – Westinghouse Motor Company Communications Errors 119


Data format [20] Transmission error code:

Code

Description

Code

Description

1

FC (function code) error

71

CRC error

(no response)

2

Illegal address

72

Parity error

(no response)

3

Illegal address (Data range error)

73

Other errors

(no response)

-Framing error
-Overrun error
-Buffer full error

7

NAK
-Priority for comm.
-No privilege for writing error
-Forbidden writing error

Data format [21] Auto tuning:

15

14

13

12

11

10 9 8 7 6 5 4 3 2 1 0

0 0 0 0 0 0

REV

FWD

Data

portion

0: Without forward rotation command
1: With forward rotation command.
0: Without reverse rotation command.
1: With reverse rotation command.


Example: P04 (motor 1 auto - tuning)=1: Forward rotation

0000 0001 0000 0001

b

=0101

H


8-4-8 Communication Errors (Exception Response)

When the inverter receives a message that does not contain communication errors but the message
can not be processed, the inverter will return an exception response. The exception response
contains an error sub-code in the data field that represents the problem.


Exception Response Errors:

Sub-

Code

Name

Causes

1

Illegal Function

Received RTU Function other than 03, 06 or 16

2

Illegal Data Address

• The starting parameter address is an unused inverter parameter.
• The starting parameter address plus the offset refers to inverter

parameter greater than the last parameter in a Function Code
sort.

• The number of registers is greater than 16.

3

Illegal Data Value

Data contains an out of range value for an inverter parameter

7

Negative

Acknowledge

• Requested data cannot be changed while the inverter is running.
• The inverter parameter function is owned by the network interface

option card and cannot be changed.

Communication errors:
Communication errors occur when the inverter receives an invalid message. The inverter will not
return a response to a communication error. A code that represents the last communication error is
stored in inverter parameter M26. Typical communication message errors include parity, framing, and
CRC errors.


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