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COPYRIGHT 2002 Process Technology
All rights reserved. Any reprinting or unauthorized use without written
permission of Process Technology is expressly prohibited.
The information in this manual has been carefully checked and is believed
to be accurate; however, no responsibility is assumed for omissions or
inaccuracies.
All information in this document is subject to change without notice.
This document contains proprietary information and is subject to the
conditions that the information:
Be retained in confidence.
•
Not be reproduced or copied in whole or in part.
•
Not be used or incorporated as part of any product except under an express
written agreement with Process Technology.
Agency Approvals
UL/CUL/CE
Important Note: The DQ15D is
designed for indoor installations
ONLY.
Electrical Noise / Interference
Process Technology electronic controls are engineered, tested and
manufactured to conform to Europe's CE levels of electrical noise and
interference found in typical industrial installations.
It is always possible for electrical noise and interference to exceed the level
of designed-in protection. This can happen, for example, if arc or spot-
welding equipment is close to the control or if they share a common
power line. It can occur if flame ignition systems or electrostatic
precipitators are in the vicinity of the control.
A more common source of interference occurs when the control is
switching inductive loads such as contactor coils, solenoids or motors. The
collapse of the magnetic field when loads such as these are switched off
can create an electrical "spike" that can cause a malfunction of the
microprocessor used in the control.
Even if the control doing the switching is unaffected, a nearby control may
be affected. To eliminate or minimize this problem, transient suppressors
or "snubbers" can be employed across the inductive load.
M-34-01
Revision - Date: 01 - 04/23/08
2
DQ15D Manual
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