Siemens RMB795B Operator's manual

s Infrastructure & Cities
Synco700
Central control unit RMB795B
For room controllers RXB/RXL and room thermostats RDG/RDF/RDU
Basic documentation
CE1P3122en
18.01.2012
Building Technologies
CE1P3122en
18.01.2012
Building Technologies

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Siemens Central control unit RMB795B CE1P3122en
Building Technologies 18.01.2012
Siemens Switzerland Ltd
Sector Infrastructure & Cities
Building Technologies Division
Gubelstrasse 22
6301 Zug
Schweiz
Phone [phone]
www.siemens.com/sbt
© 2004-2012 Siemens Switzerland Ltd
Subject to change

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Building Technologies Contents 18.01.2012
Contents
1Overview ................................................................................................10
1.1 Central control unit RMB795B ................................................................10
1.2 Product range..........................................................................................10
1.3 Synco™ 700 topology.............................................................................12
1.4 Equipment combinations.........................................................................12
1.5 Product documentation ...........................................................................13
1.6 Output .....................................................................................................13
1.7 Important notes .......................................................................................14
2Operation ...............................................................................................16
2.1 Operation without operator unit...............................................................16
2.2 Operation with operator unit....................................................................17
2.2.1 Operator unit functions............................................................................17
2.2.2 Operating concept...................................................................................17
2.2.3 Operating levels ......................................................................................19
2.2.4 Access levels ..........................................................................................19
3Room group philosophy ......................................................................21
3.1 What is a room group?............................................................................21
3.2 Application example................................................................................21
3.3 Implement application example ..............................................................24
4Engineering and commissioning guidelines .....................................26
5Commissioning .....................................................................................30
5.1 Before you start.......................................................................................30
5.1.1 Safety notes ............................................................................................30
5.1.2 Potential impact of power failures ...........................................................30
5.2 Start commissioning................................................................................31
5.2.1 Start during initial power-up ....................................................................31
5.2.2 Start from the main menu........................................................................32
5.3 Basic configuration..................................................................................32
5.3.1 Select basic type "B" ...............................................................................32
5.3.2 Assign extension modules ......................................................................33
5.3.3 Settings ...................................................................................................33
5.4 Create free configuration ........................................................................34
5.5 Wiring test ...............................................................................................34
5.6 Exit commissioning .................................................................................35
5.7 Back up data ...........................................................................................35
5.8 Exit password level .................................................................................36
5.9 View device information ..........................................................................36
5.10 Mark an intervention ...............................................................................36
6General settings....................................................................................38
6.1 Time of day and date ..............................................................................38
6.1.1 Operating principle..................................................................................38
6.1.2 Communication .......................................................................................39
6.1.3 Troubleshooting ......................................................................................40

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6.2 Select language ......................................................................................40
6.3 Select temperature unit ...........................................................................41
6.4 Operator unit display contrast .................................................................41
6.5 Text entry.................................................................................................41
6.5.1 Device name ...........................................................................................41
6.5.2 File name.................................................................................................41
6.5.3 Electronic business card .........................................................................41
6.5.4 Editable text.............................................................................................42
7Inputs......................................................................................................43
7.1 Universal inputs (Xx) ...............................................................................43
7.1.1 General settings ......................................................................................43
7.1.2 Activate function......................................................................................43
7.1.3 Cause ......................................................................................................44
7.1.4 Input terminal simulation .........................................................................44
7.1.5 Troubleshooting.......................................................................................45
7.1.6 Functional check / wiring test ..................................................................45
7.2 Analog inputs (Xx)...................................................................................45
7.2.1 Activation and type..................................................................................45
7.2.2 Measuring range .....................................................................................46
7.2.3 Measured value correction......................................................................46
7.2.4 Connection examples for sensors...........................................................47
7.2.5 Troubleshooting.......................................................................................48
7.2.6 Multiple use of sensors ...........................................................................49
7.3 Digital inputs (Xx) ....................................................................................49
7.3.1 Use and activation...................................................................................49
7.3.2 Normally closed.......................................................................................49
7.3.3 Texts for logical states 0 and 1................................................................49
7.3.4 Connection example ...............................................................................50
7.3.5 Troubleshooting.......................................................................................50
7.4 Pulse .......................................................................................................51
7.4.1 Activate function......................................................................................51
7.4.2 Connection diagram ................................................................................51
7.5 Outside temperature ...............................................................................52
7.5.1 Connection choices.................................................................................52
7.5.2 Outside temperature at terminal..............................................................52
7.5.3 Outside temperature via bus ...................................................................53
7.5.4 Outside temperature simulation ..............................................................53
7.5.5 Troubleshooting.......................................................................................53
7.6 Texts ........................................................................................................54
8Function block: "Room group"............................................................56
8.1 Overview .................................................................................................56
8.2 Activate function block ............................................................................57
8.3 Room operating modes per room group .................................................58
8.3.1 Room operating mode selector...............................................................58
8.3.2 Room mode selection via digital inputs...................................................59
8.3.3 Room operating mode selection using room unit QAW740 ....................62
8.3.4 Release room unit QAX3x.x for time switch operating mode Economy .62
8.3.5 7-day time switch ....................................................................................63
8.3.6 Holidays/special days..............................................................................64
8.3.7 Room operating mode outputs................................................................67
8.3.8 Functional check / wiring test ..................................................................69

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8.4 Setpoints and setpoint adjustments ........................................................69
8.4.1 Setpoints .................................................................................................69
8.4.2 Application example, setpoint priority, setpoint master...........................70
8.4.3 Summer/winter compensation ................................................................71
8.4.4 Relate setpoint adjustment using room unit QAW740 ............................72
8.5 Temperatures "Reference rooms"...........................................................73
8.6 Temperature supervision.........................................................................73
8.7 Optimum start control for individual room controllers .............................74
8.7.1 Activate function......................................................................................75
8.7.2 Operating principle optimum start control ...............................................75
8.7.3 Troubleshooting ......................................................................................76
8.8 Control functions for individual room controllers.....................................76
8.8.1 Priorities ..................................................................................................78
8.9 Night cooling ...........................................................................................78
8.9.1 Activate function......................................................................................78
8.9.2 Operating principle..................................................................................78
8.9.3 Troubleshooting ......................................................................................79
8.10 Fire alarm off ...........................................................................................79
8.10.1 Activate function......................................................................................80
8.10.2 Operating principle..................................................................................80
8.10.3 Troubleshooting ......................................................................................80
8.11 Smoke extraction ....................................................................................81
8.11.1 Activate function......................................................................................81
8.11.2 Operating principle..................................................................................81
8.11.3 Troubleshooting ......................................................................................82
9Logic.......................................................................................................83
9.1 Function ..................................................................................................83
9.2 Activate the logic.....................................................................................84
9.3 Assign texts.............................................................................................85
9.4 Setting values..........................................................................................85
9.4.1 Setting values switching value on and off...............................................85
9.4.2 Switch-on delay / switch-off delay...........................................................86
9.4.3 Minimum on-time.....................................................................................86
9.4.4 Minimum off-time.....................................................................................86
9.5 Operation selector...................................................................................86
9.6 Wiring test ...............................................................................................87
9.7 Priorities ..................................................................................................87
9.7.1 Notes.......................................................................................................87
9.8 Application examples ..............................................................................88
9.8.1 Application example storage tank charging ............................................88
9.8.2 Application example RS flip-flop .............................................................89
10 Function block: "faults" .......................................................................90
10.1 Purpose and activation ...........................................................................90
10.2 Fault priorities and acknowledgement ....................................................90
10.3 Universal fault inputs...............................................................................90
10.4 External fault button ................................................................................92
10.5 Fault relay ...............................................................................................92
10.6 Functional check / wiring test..................................................................94
11 Distribution zones.................................................................................95

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11.1 Overview .................................................................................................95
11.1.1 Direct application.....................................................................................95
11.1.2 Indirect application ..................................................................................96
11.1.3 Explanation example 2-pipe system .......................................................97
11.2 Function "Heat request" ..........................................................................97
11.2.1 Purpose and activation............................................................................97
11.2.2 Operating principle ..................................................................................98
11.3 Function block "Heat demand"................................................................99
11.3.1 Purpose...................................................................................................99
11.3.2 Heat demand relay..................................................................................99
11.3.3 Heat demand modulating ......................................................................100
11.3.4 Communication .....................................................................................101
11.3.5 Functional check / wiring test................................................................101
11.4 Function "Refrigeration request" ...........................................................101
11.4.1 Purpose and activation..........................................................................101
11.4.2 Operating principle ................................................................................101
11.5 "Refrigeration demand" function block..................................................103
11.5.1 Purpose.................................................................................................103
11.5.2 Refrigeration demand relay...................................................................103
11.5.3 Refrig demand modulating ....................................................................103
11.5.4 Communication .....................................................................................104
11.5.5 Functional check / wiring test................................................................104
11.6 Function block "H/C changeover" .........................................................105
11.6.1 Use and functions .................................................................................105
11.6.2 Activate function....................................................................................106
11.6.3 Preselected operating mode input H/C .................................................106
11.6.4 Operating principle ................................................................................107
11.6.5 Lock time ...............................................................................................108
11.6.6 Display current state .............................................................................108
11.6.7 Heating/cooling ch'over relay ................................................................109
11.6.8 Troubleshooting.....................................................................................109
12 Volume flow balancing VAV................................................................110
13 Communication ...................................................................................112
13.1 Activate communication ........................................................................112
13.2 "Communication" menu.........................................................................112
13.2.1 Factory settings.....................................................................................112
13.2.2 Room group 1...10 ................................................................................113
13.2.3 "Distribution zones" menu item .............................................................114
13.2.4 Universal transmission and reception zones ........................................114
14 RXB/RXL operation .............................................................................119
14.1 Operation of individual RXB/RXL room controllers ...............................119
14.2 Special features of setpoint readjustment .............................................120
15 Data acquisition...................................................................................121
15.1 Trend .....................................................................................................121
15.1.1 Connections and application.................................................................121
15.1.2 Views.....................................................................................................121
15.1.3 Trend function settings..........................................................................122
15.1.4 Troubleshooting.....................................................................................123
15.2 Meters ...................................................................................................123
15.2.1 Activate meters .....................................................................................124
15.2.2 Display format .......................................................................................124

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15.2.3 Pulse valency ........................................................................................124
15.2.4 Overflow value ......................................................................................124
15.2.5 Setting and resetting meter readings....................................................125
15.2.6 Display meter readings .........................................................................125
15.2.7 Assign texts...........................................................................................125
15.2.8 Troubleshooting ....................................................................................126
16 Device supervision .............................................................................127
16.1 Overview ...............................................................................................127
16.2 Activate function....................................................................................127
16.3 Create device list ..................................................................................127
16.4 Read device list.....................................................................................128
16.5 Fault status messages ..........................................................................129
17 Help in case of faults ..........................................................................130
17.1 Error/fault code list ................................................................................130
17.2 Troubleshooting ....................................................................................131
17.2.1 Fault indication......................................................................................131
17.2.2 Alarm acknowledgement.......................................................................132
17.2.3 Delete fault status messages................................................................132
17.3 Troubleshooting ....................................................................................133
18 Electrical connections........................................................................134
18.1 Connection rules ...................................................................................134
18.2 Connection terminals ............................................................................135
18.2.1 Central control unit RMB795B ..............................................................135
18.2.2 Universal modules RMZ785..................................................................135
18.2.3 Universal module RMZ787 ...................................................................135
19 Appendix..............................................................................................136
19.1 Abbreviations used ...............................................................................136
19.2 Configuration diagram...........................................................................136
19.2.1 Explanation of configuration principle ...................................................136
19.2.2 Overview of function blocks ..................................................................137
19.2.3 Configuration diagram RMB795B .........................................................140
19.3 C3127_Planning and commissioning protocol......................................141

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Building Technologies Overview 18.01.2012

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Siemens Central control unit RMB795B CE1P3122en
Building Technologies Overview 18.01.2012
1 Overview
1.1 Central control unit RMB795B
The RMB795B is a central control and operator unit for room control in connection
with SyncoTM RXB/RXL and with room thermostats RDG/RDF/RDU. It significantly
extends the field of use of the SyncoTM system.
The room controller RXB/RXL and Synco room thermostats RDG/RDF/RDU are
referred to below as individual room controller.
Thanks to the KNX bus, the bus communication capability of the controller network
can be used in the easiest possible manner. For that, the typical easy-to-
understand SyncoTM operating concept has been maintained.
Whether for end-users, engineering, service or commissioning staff, menu-driven
operation in clear-text underlines the system’s user-friendliness at all levels.
The RMB795B central control unit is operated via a plug-in type or detached
operator unit.
The RMB795B central control unit facilitates central operation of room groups
equipped with RXB/RXL room controllers while offering the following features:
•Time switch, calendar and special day programs
•Preselected setpoints and trend functions
•Supervision of the highest / lowest temperatures and device supervision
•Collects and forward demand signals to the primary side
1.2 Product range
The table below shows the various comprehensive solutions for use with the
RMB795B and individual room controllers:
Room unit Illustration Name Type Data
Sheet
Switching and
control units
Central control
unit
RMB795B N3122
Room controlled
Room controller
RXB..
RXL
N3873
N3874
N3877
Room thermostat RDF N3171
What is the RMB795B
central control unit?
Note
KNX makes it possible
User-friendliness
at all levels
Function
Control units,
accessories