Danfoss AK-SC255 Manuel de dépannage - Page 4

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AK-SC255

Does Not Communicate with

AK-SC255

(I/O with AK-SC255 Controller)

Comm module issues associated

with the AK-SC255

Will not scan (Scanning Issues)

I/O Network Failure

For Danfoss Technical Support call +1-410-931-8716.

Troubleshooting Guide

•

Check address configuration of the Comm Module associated with your I/O

and insure that it matches what you have configured.

•

Check to insure that there is 24 volts present at the Comm Module.

•

Cycle power to the Comm Module on the lineup with the problem.

•

Rescan I/O Network.

•

Check all wiring and physical connections.

•

Check that all Comm Modules and associated I/O are powered on and are

addressed as configured. Remember, if you have made an address change to

Comm Module for your I/O it must have power cycled before it will hold the

new address.

•

Check to see that you are scanning the correct communication buss by going

to Communications, I/O Network, Rescan Channels. If you have questions

about which buss you should be scanning for call Danfoss Technical Support

for further assistance.

•

I/O Comm failures do not necessarily indicate that an individual module is

bad but rather that for some reason communication messages are getting

dropped. Check with Danfoss Technical Support for other options before

replacing the suspect module.

•

Check that all Comm Modules and associated I/O are powered on and are

addressed as configured. Remember, if you have made an address change to

Comm Module for your I/O it must have power cycled before it will hold the

new address.

•

Check all wiring and physical connections. See Figures 1, 2 and 3 on page 2.

•

Check to see that you are scanning the correct communication buss by going

to Communications, I/O Network, Rescan Channels. If you have questions

about which buss you should be scanning for call Danfoss Technical Support

for further assistance.

•

This message indicates that the AK-SC255 does not see any attached I/O.

•

Check that all I/O powered on and is addressed as configured. Remember, if

you make an address change to Com Mod for your I/O it must have power

cycled before it will hold the new address.

•

Check to see that you are scanning the correct communication buss by going

to Communications, I/O Network, Rescan Channels. If you have questions

about which buss you should be scanning for call Danfoss Technical Support

for further assistance.

•

Fig. 1 on page 3 shows a TP-78 unit with a full row of 5 LON terminals. An RS-

485 version is also available. Note: it is important that you have the correct

Comm modules to match the specific type of AK-SC255 that you have.

USCO.EI.RF0.D1.22 / 521U0152