Operating Instructions

Table of Contents
Siemens Building Technologies, Inc. III
Reversal of the Motor’s Direction of Rotation.................................................. 53
OFF Functions ...................................................................................................... 53
OFF1 ............................................................................................................... 53
OFF2 ............................................................................................................... 54
OFF3 ............................................................................................................... 54
Control Types (P1300) ......................................................................................... 54
Communications................................................................................................... 55
SED2 HVAC Functions.............................................................................................. 55
PID Controller ....................................................................................................... 55
Belt Failure Detection without Sensor (P2181) .................................................... 57
Belt Failure Detection with Sensor (P0400) ......................................................... 59
Staging Pumps or Fans ........................................................................................ 60
Temperature Control with Ni 1000 Sensor ........................................................... 65
Other Typical HVAC Applications .............................................................................. 67
Chapter 7 — Troubleshooting ..................................................................................... 68
Troubleshooting Using the Operator Panel ............................................................... 68
Fault Codes................................................................................................................ 69
Reading Faults........................................................................................................... 75
Resetting Faults ......................................................................................................... 75
Warning Messages .................................................................................................... 75
Chapter 8 — Technical Data Specification Options.................................................. 79
General Specifications............................................................................................... 79
Dimensions and Weights ........................................................................................... 81
Unit-specific Data....................................................................................................... 81
Options....................................................................................................................... 85
Chapter 9 — SED2 Communications.......................................................................... 87
Overview .................................................................................................................... 87
Using the Serial Interface .......................................................................................... 87
Working with Serial Communications ........................................................................ 87
Introduction ........................................................................................................... 87
RS-232 and RS-485 Serial Interfaces .................................................................. 88
RS-232 ............................................................................................................ 88
RS-485 ............................................................................................................ 88
Typical RS-485 Multi–drop Interface .................................................................... 88
Troubleshooting with RS-485.......................................................................... 88