Application

Sequence of Operation
Application Notes
8
Siemens Industry, Inc. Application Note, App 2030 140-1021
2015-08-07
Application Notes
 If FLOW is oscillating while FLOW STPT is constant, then the flow loop requires
tuning.
 The controller, as shipped from the factory, keeps all associated equipment OFF.
 Spare DOs can be used as auxiliary points that are controlled by the field panel
after being defined in the field panel’s database. The combination of DO 3 and DO
4 may be used as auxiliary motor points. If using this pair of spare DOs to control a
motor, you must unbundle MTR2 COMD and set MTR SETUP.
For more information, contact your local Siemens Industry representative.
Wiring Diagrams
NOTE:
The controller’s DOs control 24 Vac loads only. The maximum rating is 12 VA for
each DO. An external interposing relay is required for any of the following:
• VA requirements higher than the maximum
• 110 or 220 Vac requirements
• DC power requirements
• Separate transformers used to power the load
(for example, part number 540-147, Terminal Equipment Controller Relay Module)
Application 2030 – Constant Volume Cooling Only.