Operating Instructions

Troubleshooting
General Bypass
39
Siemens Industry, Inc. BT300 Bypass Operator's Manual DPD01391
Building Technologies 2017-09-28
Problem Description Possible Cause
Drive does not start on closing of the
run command.
● The Siemens BT300 Bypass is not in Drive - Auto Mode.
● Drive output contactor is not closed.
● Remote contact is not closed. Replace with jumper to verify.
● Run relay has failed.
● Loose control wire connection.
● The BT300 Drive Digital Input 1 is not programmed properly.
Diagnostic Test Points
The diagnostic board provides a centralized location for diagnostics troubleshooting.
The test points on this board make it easier to troubleshoot the bypass components.
Figure 9: Diagnostic Test Points.