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Knowledge Base

UPS5000 E ATS Communication failure

Publication Date:  2018-11-29  |   Views:  1329  |   Downloads:  0  |   Author:  a84046959  |   Document ID:  EKB1002019788


Issue Description

UPS LCD shows 0148-002 Major alarm (ATS communication
failure) and cannot read data from ATS. ATS Tx/Rx communication led is OFF .

Symptoms : 1.1  No data from ATS in UPS LCD                                                                         


1.2.Tx/Rx communication led on ATS is OFF




Alarm Information

1.3 UPS ALARM – ATS FAULT 0148-002

Handling Process

2.Checking methods :

2.1.Check COM2 cable connection on monitoring interface card of UPS

After checking, if connection good go to 2.2

2.2.Check XT2 board 8 pin connection


After checking if connection is not good > go to 2.3

2.3Checking the CAN connection on PU1, PU2 and PU3


After checking, if connection is good > go to 2.4


2.4 Open ATS cover and check the ATS board on top connections. Check X32, X23 and X51 connections :


After checking ATS communication board on top, found out that X51 board was unplugged :  Probably reason – Unplugged during  transportation

X51 Weak connection :







Root Cause

Root cause : The X51 board on top of the ATS was unplugged (probably transportation or handling reasons) and the UPS cannot communicate with the ATS (automatic transfer switch) .


Solution :

Plug in the X51 board on top of the ATS in order for the UPS to be able to communicate with the ATS.

After plug in the X51 board back in the ATS and UPS power ON, the alarm cleared and UPS can see data from ATS :