Operating Instructions

Chapter 4 – Basic Service and Maintenance
Basic Service Information
18
Siemens Industry, Inc.
Owner's Manual
125-5085
06/30/2015
Chapter 4 – Basic Service and Maintenance
This chapter describes corrective measures you can take should you encounter a
problem when using a Pressurization Room Controller.
You are not required to do any controller troubleshooting. You may want to contact
your local Siemens Industry representative if a problem occurs or you have any
questions about the controller.
NOTE:
When troubleshooting, record the problem and what actions were performed
immediately before the problem occurred. Being able to describe the problem in detail
is important should you need assistance from your local Siemens Industry
representative.
Basic Service Information
Always remove power to the Pressurization Room Controller when installing or
replacing it. Since the controller does not have a power switch, the recommended
method of removing power to a locally powered controller is to turn OFF the power to
the 24 Vac transformer. The recommended method of removing power to a controller
on a power cable (even to service a single controller) is to turn OFF the power at the
transformer.
NOTE:
When removing power to a controller to perform maintenance or service, make sure
that the person in charge of the facility is aware of this and that appropriate steps are
taken to keep the building in control.
Never remove the cover from the Pressurization Room Controller. There are no
serviceable parts inside. If a problem is found with this device, contact your local
Siemens Industry representative for replacement. An anti-static wrist strap is
recommended when installing or replacing controllers.
Preventive Maintenance
Most controller components are designed so that, under normal circumstances, they
do not require preventive maintenance. Periodic inspections, voltage checks, and point
checks are normally not required. The rugged design makes most preventive
maintenance unnecessary. However, devices that are exposed to dusty or dirty
environments may require periodic cleaning to function properly.
Safety Features
The controller board stores the controller's address, applications, and point values. In
the event of a power failure or a reset, these values are retrieved from the controller's
permanent memory and are used by the controller unless overridden by a field panel. If
one of the following conditions occurs, the controller will activate safety features
present in its fail-safe mode.
 Sensor failure.
 Loss of power. Upon controller power loss, communication with the controller is
also lost. The controller will appear as failed (*F*) at the field panel.