Datasheet
Solid-State Switching Devices for Resistive Loads
3RF29 Function Modules
SIRIUS power regulators for 3RF2
4/102
Siemens IC 10 · 2011
* You can order this quantity or a multiple thereof.
Illustrations are approximate
4
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Overview
Power regulators for 3RF2 single-phase solid-state
switching devices
The power regulator is a function module for the autonomous
power control of complex heating systems.
The following functions have been integrated:
• Power controller with proportional-action control
for adjusting
the power of the connected load. Here, the setpoint value is set
with a rotary knob on the module as a percentage with refer-
ence to the 100 % power stored as a setpoint value. Changes
in the mains voltage or in the load resistance are compensated
in this case.
• Inrush current limitation:
With the aid of an adjustable voltage
ramp, the inrush current is limited by means of phase control.
This is useful above all with loads such as lamps which have
an inrush transient current.
• Load circuit monitoring
for detecting load failure, alloyed
power semiconductors, lack of voltage or a break in the load
circuit. Part-load monitoring is not possible. Load fluctuations
are compensated.
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Application
The power regulator can be used for:
• Complex heating systems
• Heating elements with temperature-dependent resistor
• Heating elements with ageing after long-time service
• Simple indirect control of temperature
The power regulator can be used on the instantaneously switch-
ing 3RF21 and 3RF23 solid-state switching devices (single-
phase). If only the full-wave operating mode is used, the power
regulator can also be used on the zero-point switching solid-
state relays and contactors.
Power control
The power regulator adjusts the power in the connected load by
means of a solid-state switching device depending on the taught
power and the selected setpoint. Changes in the mains voltage
or in the load resistance are thus compensated by the power
regulator. The setpoint value can be predefined externally as a
0 to 10 V signal or internally by means of a potentiometer. De-
pending on the setting of the potentiometer (t
R
), the adjustment
is carried out according to the principle of full-wave control or
generalized phase control.
Full-wave control
In this operating mode the output is adjusted to the required set-
point value changing the on-to-off period. The period duration is
predefined at one second.
Generalized phase control
In this operating mode the output is adjusted to the required set-
point value by changing the current flow angle. In order to ob-
serve the limit values of the conducted interference voltage for
industrial networks, the load circuit must include a reactor with a
rating of at least 200 µH.
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Selection and ordering data
Rated operational current
I
e
Rated operational voltage
U
e
DT Screw terminals PU
(UNIT,
SET, M)
PS* PG
AV
Order No. Price
per PU
Power regulators
3RF29
Rated control supply voltage 24 V AC/DC
20 110 … 230 A
3RF29 20-0HA13 1 1 unit 101
20 400 … 600 A
3RF29 20-0HA16 1 1 unit 101
50 110 … 230 A
3RF29 50-0HA13 1 1 unit 101
50 400 … 600 A
3RF29 50-0HA16 1 1 unit 101
90 110 … 230 A
3RF29 90-0HA13 1 1 unit 101
90 400 … 600 A
3RF29 90-0HA16 1 1 unit 101
Rated control supply voltage 110 V AC
20 110 … 230 A
3RF29 20-0HA33 1 1 unit 101
20 400 … 600 A
3RF29 20-0HA36 1 1 unit 101
50 110 … 230 A
3RF29 50-0HA33 1 1 unit 101
50 400 … 600 A
3RF29 50-0HA36 1 1 unit 101
90 110 … 230 A
3RF29 90-0HA33 1 1 unit 101
90 400 … 600 A
3RF29 90-0HA36 1 1 unit 101
Version DT Order No. Price
per PU
PU
(UNIT,
SET, M)
PS* PG
Optional accessories
3RF29 00-0RA88
Sealable covers
for function modules (not for converters)
B
3RF29 00-0RA88 1 10 units 101
© Siemens AG 2010