SIEMENS
6/100
Siemens IC 10 · 2017
* You can order this quantity or a multiple thereof.
Illustrations are approximate
Solid-State Switching Devices for Resistive/Inductive Loads
Function Modules
SIRIUS power regulators for 3RF2
6
■
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 P-control:
for adjusting the power of the connected load. The setpoint
value is selected via a rotary knob on the module as a
percentage of the 100 % power value stored. 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. Partial load monitoring
is not possible. Load fluctuations are compensated.
■
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
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.
Depending 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.
Note:
In the case of ohmic loads, the power is set linear to the setpoint
value. During operation of inductive loads, the power control is
no longer proportional and linear due to the phase shift between
current and voltage.
Full-wave control
In this operating mode the output is adjusted to the required
setpoint value by changing the on-to-off period. The period
duration is predefined at one second.
See note about AC loads on page 6/96.
Generalized phase control
In this operating mode the output is adjusted to the required
setpoint value by changing the current flow angle. In order to
observe 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.
■
Selection and ordering data
■
Accessories
Rated operational current
I
e
Rated operational voltage
U
e
SD
Screw terminals
PU
(UNIT,
SET, M)
PS*
PG
A
V
d
Article No.
Price
per PU
Power regulators
3RF2920-0HA13
Rated control supply voltage 24 V AC/DC
20
110 ... 230
2
3RF2920-0HA13
1
1 unit
41C
20
400 … 600
2
3RF2920-0HA16
1
1 unit
41C
50
110 ... 230
2
3RF2950-0HA13
1
1 unit
41C
50
400 … 600
2
3RF2950-0HA16
1
1 unit
41C
90
110 ... 230
2
3RF2990-0HA13
1
1 unit
41C
90
400 … 600
2
3RF2990-0HA16
1
1 unit
41C
Rated control supply voltage 110 V AC
20
110 ... 230
2
3RF2920-0HA33
1
1 unit
41C
20
400 … 600
2
3RF2920-0HA36
1
1 unit
41C
50
110 ... 230
2
3RF2950-0HA33
1
1 unit
41C
50
400 … 600
2
3RF2950-0HA36
1
1 unit
41C
90
110 ... 230
2
3RF2990-0HA33
1
1 unit
41C
90
400 … 600
2
3RF2990-0HA36
1
1 unit
41C
Version
SD
Article No.
Price
per PU
PU
(UNIT,
SET, M)
PS*
PG
d
Optional accessories
3RF2900-0RA88
Sealable covers
for function modules
(not for converters)
5
3RF2900-0RA88
1
10 units
41C
© Siemens AG 2016