Operating Instructions

Troubleshooting Procedures
Siemens Building Technologies, Inc. 5-21
Figure 5-6. Relay Module (540-147).
Table 5-4. Relay Module (540-147) Connections.
ATEC
Relay Module
Input Terminal
Pin
Relay
Number
Relay Module
Terminal Block
DO Screw Terminal
1 – COMMON – 2
2 K1 COM1, NO1, NC1 DO 3 1
3 K2 COM2, NO2, NC2 DO 4 3
4 K3 COM3, NO3, NC3 – –
5 K4 COM4, NO4, NC4 – –
B. Load controlled by relay turns OFF when it should be ON, and ON
when it should be OFF.
Rewire load being controlled to the proper relay module terminals. Use caution when
wiring, or contact your Siemens Building Technologies representative for service.
C. Relay never de-energizes.
Check that the cabling connecting controller board to relay module is not shorted.
D. Load never turns OFF (low voltage loads only).
Contact your local Siemens Building Technologies representative for replacement of
relay module.