SIEMENS
6/99
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 controllers for 3RF2
6
■
Overview
Power controllers for 3RF2 single-phase solid-state
switching devices
The power controller is a function module for the autonomous
power control of complex heating systems and inductive loads.
The following functions have been integrated:
• Power controller:
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.
• 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 or infrared lamps which have an
inrush transient current.
• Load circuit monitoring:
for detecting load failure, partial load faults, alloyed power
semiconductors, lack of voltage or a break in the load circuit.
Note:
With the phase control operating mode, a partial load fault is
detected by cyclic "scanning" of the load; the exact mode of
operation is described in the data sheets!
Special version:
Deviations from the standard version
3RF2904-0KA13-0KC0
During the teach routine, the connected solid-state relay or
contactor is not activated; i.e. no current will flow. No current
reference value is stored. No part-load monitoring!
3RF29..-0KA1.-0KT0
No part-load monitoring!
■
Application
The power controller can be used for:
•Complex heating systems
•Inductive loads
•Loads with temperature-dependent resistor
•Loads with ageing after long-time service
•Simple indirect control of temperature
Power control
The power controller adjusts the power in the connected load by
means of a solid-state switching device depending on the
setpoint selection. It does not compensate for changes in the
mains voltage or load resistance. 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
), it is controlled 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
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 controllers
3RF2920-0KA13
Rated control supply voltage 24 V AC/DC
4
110 ... 230
2
3RF2904-0KA13-0KC0
1
1 unit
41C
4
2
3RF2904-0KA13-0KT0
1
1 unit
41C
20
2
3RF2920-0KA13
1
1 unit
41C
50
2
3RF2950-0KA13
1
1 unit
41C
90
2
3RF2990-0KA13
1
1 unit
41C
20
400 … 600
2
3RF2920-0KA16
1
1 unit
41C
50
2
3RF2950-0KA16
1
1 unit
41C
50
2
3RF2950-0KA16-0KT0
1
1 unit
41C
90
2
3RF2990-0KA16
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