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865
7
RWF40... complete with housing
Compact
RWF40...
Universal Controllers
The RWF40... is a universal digital boiler temperature / pressure controller with
functions designed specifically for the control of heat generating plant.
The RWF40... and this Data Sheet are intended for use by OEMs which integrate
the controller in their products!
Mechanical design
The controller is supplied complete with housing for flush panel mounting. The
RWF40... is matched to the controlled variable and the required setpoint range by making parameter settings. The control parameters can be set and optimized while the
burner is running. All settings are made with 4 buttons located on the unit front and are
directly displayed.
LEDs on the front indicate the following operating states:
- Control ON / OFF
- Positioning pulses ON or OFF for driving the burner´s air damper when using
modulating burner control, or stage I / stage II when using 2-stage burner control
- «2-stage» operating mode
- Position of the configurable contact «K6»
- Manual control ON / OFF
During operation, the digital display above the LEDs shows the setpoint (green), the
actual value (red) and – when making parameter settings – the relevant parameters.
CC1N7865en
01.09.2005
Building Technologies
HVAC Products
Page 2
Warning notes
Mounting notes
Installation notes
To avoid injury to persons, damage to property or the environment, the following
warning notes should be observed!
Do not open, interfere with or modify the controller!
• All activities (mounting, installation and service work, etc.) must be performed by
qualified staff
• When selecting the cables, when making the installation and the electrical connec-
tions, observe the regulations of VDE 0100 «Erection of power installations with
rated voltages below AC 1000 V» and the relevant national regulations
• Provide double-pole isolation of the controller from the mains supply if there is a
risk of touching live parts while work is carried out
•
Check to ensure that wiring is in an orderly state
• Fall or shock can adversely affect the safety functions. Such units must not be put
into operation, even if they do not exhibit any damage
• Ensure that the relevant national safety regulations are complied with
• Please observe the notes given in the user documentation B7865
Commissioning notes
Standards and certificates
Service notes
• Prior to commissioning the plant, check to ensure that wiring is in an orderly state
Conformity to EEC directives
- Electromagnetic compatibility EMC (immunity)
- Electromagnetic compatibility EMC
NAMUR recommentation
89 / 336 EEC
NE21, EN 50 081 part 1
and EN 50 082 part 2
ISO 9001: 2000
Cert. 00739
ISO 14001: 1996
Cert. 38233
• For service purposes, the controller can be removed from its housing with no need
for tools
• The electrical connections ar e made via the screw terminals located at the rear of
the housing
• Each time a unit has been replaced, check to ensure that wiring is in an orderly
state and that the wires are firmly connected
Disposal notes
The unit contains electrical and electronic components and must not be disposed of
together with household waste.
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Local and currently valid legislation must be observed.
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Type summary
A
ccessories
Controller with RWF40.000A97
- 3-position output
- housing
- fixing material and seal
Controller with RWF40.001A97
- 3-position output
- analog output
- housing
- fixing material and seal
Controller with RWF40.002B97
- 3-position output
- analog output
- RS-485 port
- housing
- fixing material and seal
Packaging variants (20 pieces, without documentation) RWF40.010A97
RWF40.011A97
Adapter frame for replacing the RWF32... ARG40
Bracket ARG41
For mounting the RWF40... on 35 mm DIN rails to DIN 46277
Dummy cover AVA10.200/109
For covering a panel cutout for the RWF40...
Demo case KF8892
For demonstrating the functions of the RWF40... controller
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Technical data
General controller data
Environmental
conditions
Mains voltage AC 110...240 V +10 % / -10 %
Mains frequency 48...63 Hz
Safety class II to DIN 0631
Mounting position optional
Terminals for 2 x 1.5 mm² or 1 x 2.5 mm²
Power consumption max. 10 VA
Safety extra low-voltage DC 24 V
Contact rating of the control outputs
(relays «K1...K3»)
- Up to 2 x 10
- Up to 10
5
switching cycles
7
switching cycles
2 A / AC 24...240 V
0.1 A / AC 24...240 V
Weight complete with housing approx. 760 g
Recommended actuator running time 15...60 s
Degree of protection of housing
- Front
- Base
IP 65, EN 60529
IP 20, EN 60529
Storage
DIN EN 60 721-3-1
Temperature range -20...+60 °C
Humidity < 75 % r.h.
Transport
Temperature range -40...+70 °C
Humidity < 75 % r.h.
Operation
Temperature range -20...+50 °C
Humidity < 75 % r.h.
Condensation, formation of ice and ingress of water are not permitted!
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Page 5
Function
Block structure
The RWF40... provides the following functions:
- One digital PID controller with a 3-position or analog output (optional)
- To control 2-stage burners, the RWF40... can be switched over to provide 2-
position control
- Automatic thermostat (or pressurestat) function in low-fire operation
- One shift controller for weather-dependent setpoint shifting
- One minimum limiter and on e maximum limiter for the boiler temperat ure or the
boiler pressure
- One limit thermostat to DIN 3440 (output 1)
- One potential-free configurable contact
- Manual operating mode
- Communication via serial port (option)
- Self-setting function
3 analog inputs
Input 1:
Actual value
for Pt100, Ni100, Pt1000,
LG-Ni1000,
thermocouples
or standard signals
Input 2:
External setpoint,
setpoint shifting
for 0...1 k resistor
or linearized
standard signals
Input 3:
Outside temperature
for Pt1000, LG-Ni1000
Ω
Release of burner
Output 1:
- Relay (N.O. contact)
Floating ou tput
Output 2:
-Relay (actuating device open)
Output 3:
- Relay (actuating device closed)
Limit comparator
Output 4:
- Relay (N.O. contact)
2 binary inputs
For potential-free
contacts
Input 1:
Operating mode changeover
Input 2:
Setpoint shifting /
changeover
Power supply
AC 110 ...240 V +10%/-10%,
48...63 Hz, max. 10 VA
7865f01e/0905
RWF40...
Power supply measuring transducer
DC 24 V, 30 mA
(short-circu it proof)
Analog output (optional)
Output 5:
Analog output
DC 0...10 V, DC 0...20 mA,
DC 4...20 mA
Serial port (optional)
RS-485
MOD bus protocol
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Page 6
Function of the controller when used for burner control
Low-fire operation
In low-fire operation, the RWF40... operates like a control thermostat or pressurestat.
This means that it operates as a 2-position controller maintaining the required setpoint
by switching the burner on and off. The switching differential for 2-position operation
can be adjusted within a wide range. If the demand for heat increases, the controller
switches to high-fire operation only when an adjustable limit is exceeded. This function
is aimed at optimizing the burner´s switching ratio.
High-fire operation,
2-stage control
In that case, the RWF40... operates as a 2-position controller with adjustable switching
thresholds. Using the relays of the 3-position output, the RWF40... drives the actuator
to the 1
switches between the minimum signal for the 1
for the 2
st
and 2nd output stage. In this operating mode, the optional analog output
nd
stage.
High-fire operation,
modulating control
In that case, the RWF40... operates as a PID / PI controller with a 3-position output
without position feedback signals or, optionally, with a modulating output. By making
use of its self-setting facility, the RWF40... is able to determine the PID / PI control
parameters, or the parameters can be set manually.
Binary input 1 (changeover of operating mode)
Using a potential-free contact, the RWF40... can be switched from the modulating
mode to 2-stage operation.
Binary input 2 (setpoint
shifting or setpoint
changeover)
In the case «setpoint shifting» is configured, the current setpoint is shifted by an adjustable amount. Configuration of «setpoint changeover» provides changeover between 2
setpoints adjusted on the RWF40... If analog input 2 is configured for an «external setpoint», changeover is provided between the setpoint adjusted on the RWF40... and an
external setpoint.
Limit comparator
Potential-free contact «K6» can be assigned a number of functions.
Example:
Limit value supervision
Operation
4 buttons on the unit front are used to operate and program the RWF40... During operation and programming, the 7-segment displays show the parameter values and parameter names.
Weather-dependent
setpoint shifting
The controller´s standard configuration ex works is such that when connecting a
QAC22… outside sensor, automatic changeover to weather-dependent setpoint shifting
takes place.
The signal delivered by the QAC2... outside sensor must not be fed parallel to several RWF40...!
st
stage and the maximum output signal
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Page 7
Function of the controller when used for burner control (cont´d)
A
A
nalog input 1 (actual
value sensor)
To acquire the actual value, a number of sensors can be connected to the RWF40...
Measurement range
2-or 3-wire resistance
sensors
Thermocouples NiCr-Ni / type «K» -200...+1372 °C (-328...+2502 °F)
Cu-Cu-Ni / type «T» -200...+400 °C (-328...+752 °F)
NiCroSil-NiSil / type «N» -100...+1300 °C (-148...+2372 °F)
FeCuNi / type «J» -200...+1000 °C (-328...+1832 °F)
Pt-RhPt / type «S» 0...1768 °C (-32...3214 °F) ¹)
Pt-RhPt / type «R» 0...1768 °C (-32...3214 °F) ¹)
Pt-RhPt / type «B» 0...1820 °C (32...3308 °F) ¹)
Linearized standard
signals
Pt100 / IEC 751 -200...+850 °C (-328...+1562 °F)
Pt1000 / IEC 751 -200...+850 °C (-328...+1562 °F)
Ni100 / DIN 43760 -60...+230 °C (-76...+482 °F)
Ni1000 / DIN 43760 -60...+230 °C (-76...+482 °F)
LG-Ni1000 -50...+160 °C (-58...+320 °F)
0...20 mA scalable -1999...+9999
4...20 mA scalable -1999...+9999
DC 0...10 V scalable -1999...+9999
DC 0...1 V scalable -1999...+9999
¹) Only RWF40.0X2B97
The power provided for the measuring transducers is DC 24 V / 30 mA.
nalog input 2 (external
setpoint shift or external
setpoint)
Feeding a signal to analog input 2, the controller´s setpoint can be influenced. The
influence can be scaled.
The following signals can be used:
- Input signals DC 0...1 V, DC 0...10 V, 0...20 mA, 4...20 mA
- 1 kΩ potentiometer in a 2-wire circuit
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Page 8
Connection diagram (basic diagram)
Temperature and pressure control on a dual-fuel burner.
Burner control and supervision are provided by burner control type LAL... or LFL...
Note
DC 24 V at terminals «G+» and «G-» is used for powering the QBE... pressure sensor!
LN
G1+ M1B9
RWF40...
M9
XB6 M6
Q13
Q14
Y1
Y2D1Q
GND
D2
Legend
LAL..., LFL...
19
45
ST
B
MB M
QAE...
QAC...
MR
BSG...
0
I
L
N
GAS
18
BS
2
1
0
BV1
LK
N
RV
BV1
BV2
v
7865a01/1004
a
OIL
9
20
1110
z
M
~
m
MIN.
int. ext.
S1
SQ...
RWF40...
SQ...
GND
D2
int. ext.
S1
G+ M1 XU 6 M6
LN
U1-
G-
Q13
Q14
Y1
Y2D1Q
LAL..., LFL...
19
45
ST
B
G
M
18
BS
2
1
0
9
20
1110
QBE...
0...10 V
BSG...
0
I
L
N
GAS
BV1
LK
N
RV
BV1
v
BV2
a
OIL
7865a02/0905
z
M
~
m
MIN.
a Limit switch for air damper position OPEN QAE... Immersion temperature sensor
BS Operation selector QBE... Pressure sensor
1 = firing on gas RV Gas control damper
(modulating burner control) S1 Internal / external setpoint switch (E)
2 = firing on oil SQ... Actuator of burner´s air damper and gas
(2-stage burner control) control damper
BV... Fuel valve ST Connections for burner control´s start
BSG... Remote setpoint adjuster (active when control loop
«S1» is closed) v Auxiliary switch for the release of the
L... Burner control 2nd fuel valve depending on the air damper
LK Burner´s air damper position
m (MIN) Auxiliary switch for controlling low-fire z End switch for the fully CLOSED
operation positi on of the air damper
QAC... Outside sensor for weather-dependent
setpoint shifting
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Page 9
Dimensions
A
Dimensions in mm
48
RG40 adapter frame
RWF40
PGM EXIT
43,5
K6
96
15,5
91,5
127,5
112
Panel cutout to DIN 43 700
+0,6
45
+0,8
92
7865m01e/0300
7865m02/0799
Building Technologies CC1N7865en
HVAC Products 01.09.2005
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Page 10
Dimensions (cont´d)
A
RG41
94
8
3
35,5
Dimensions in mm
61,4
45
13
60
153
68
83
45
7,5
12,5
7865m04/1004
© 2005 Siemens Building Technologies Production GmbH
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Building Technologies CC1N7865en
HVAC Products 01.09.2005
Subject to change!
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