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Siemens POWERS RL 243 MP, Technical Instructions

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Siemens POWERS RL 243 MP Technical Instructions Download Page 8

Technical Instructions 

RL 243 MP Multi-Purpose Relay 

Document Number 155-042P25 
September 10, 2018 

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as 
design improvements are introduced. POWERS is a registered trademark of Siemens Industry, Inc. Other product or company names mentioned 
herein may be the trademarks of their respective owners. © 2018 Siemens Industry, Inc. 

 

Siemens Industry, Inc. 

Building Technologies Division 
1000 Deerfield Parkway 
Buffalo Grove, IL 60089 
+ 1 847-215-1000 

Your feedback is important to us. If you have 
comments about this document, please send them 
to 

[email protected]

 

Document No. 155-042P25  

Printed in the USA 

Page 8 

 

 

Installation 

(See Installation 
Instructions 129-121 
for more information.) 

Multi-Purpose Relay with integrel bracket can be installed on panels, ducts, unit 
ventilators, or any other vertical or horizontal surface. Relay also can be panel mounted to 
facilitate manual adjustment. 

Technical Bulletin

 155-246 (TB 148) shows panel mounting 

arrangement. 

•

 

Slotted base accommodates screws or bolts for direct horizontal mounting within 
panel or on a flat wall surface. 

•

 

Integral bracket allows vertical mounting with panel or on a flat wall surface. 

Dimensions 

 

Figure 11

.  

Dimensions in Inches (Millimeters)

. 

 

Summary of Contents for POWERS RL 243 MP

Page 1: ...sembly prevents signal lock up and assures fail safe operation The relay housing is provided with integral brackets to facilitate installation without a separate bracket A single spring adjustment is provided to allow setting the relay for desired operation The relay is adaptable for flush panel mounting to facilitate manual readjustment if desired Product Number 243 0009 Operation The relay outpu...

Page 2: ...d on the main diaphragm is caused by the air pressure at TD These downward forces are balanced by air pressure R pushing up on the main diaphragm Spring force S1 is adjustable up to an equivalent pressure of 25 psi Specifications Instrument air supply Normal 0 2 5 psi 0 to 172 kPa Maximum 30 psi 207 kPa Temperature limits Ambient 40 to 120 F 4 4 to 49 C Storage 20 to 120 F 29 to 49 C Adjustments S...

Page 3: ...ations can be obtained depending upon how it is piped and applied with other devices in a single system Direct acting amplifying See Figure 2 Reverse acting amplifying See Figure 3 Lower pressure transfer relay See Figure 4 Signal advancing relay See Figure 5 Minimum pressure relay See Figure 6 DA or RA limit control See Figures 7 and 8 Signal inverting relay See Figure 9 Characterized minimum pre...

Page 4: ...is adjusted with spring setting Relay is fail safe and cannot generate an output signal unless a source of air is available at S port Figure 3 Figure 3 Reverse Acting RA Amplifying Relay Lower Pressure Transfer Relay Output pressure will equal the lower of the two input signals Internal relief valve prevents signal lock up when pressure at S port drops below relay output pressure maximum different...

Page 5: ...able air supply at S port Figure 5 Figure 5 Signal Advancing Relay Minimum Pressure Relay Relay output will always provide a minimum pressure as adjusted with spring S 1 Variations in input signal below this minimum will not affect output pressure Output pressure will equal input pressure for any value over the minimum setting Air supply to S port can be from EP valve or equivalent to provide inte...

Page 6: ...ntrol Spring S 1 can be adjusted to allow a minimum output which will not be under control of the limiting device Figure 7 Figure 7 Direct Acting DA Limit Control Reverse Acting RA Limit Control Variable pressure signal from primary controller will pass directly to relay output Maximum relay output can be adjusted with spring S 1 An air pressure signal from the limiting device will reduce the poss...

Page 7: ...1 2 of spring setting A further rise in input pressure will reduce output by an equal amount Figure 9 Figure 9 Signal Inverting Relay Characterized Min Pressure Relay Initial input from controller will increase relay output above minimum at a 2 1 ratio until relay output is twice the minimum value A further increase in input pressure will increase the output an equal amount 1 1 ratio Figure 10 Fig...

Page 8: ...000 Your feedback is important to us If you have comments about this document please send them to sbt_technical editor us sbt siemens com Document No 155 042P25 Printed in the USA Page 8 Installation See Installation Instructions 129 121 for more information Multi Purpose Relay with integrel bracket can be installed on panels ducts unit ventilators or any other vertical or horizontal surface Relay...

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