SIEMENS
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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 converters for 3RF2
6
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Overview
Converters for 3RF2 solid-state switching devices
These modules are used to convert analog control signals, such
as those output from many temperature controllers for example,
into a pulse-width-modulated digital signal. The connected
solid-state contactors and relays can therefore regulate the
output of a load as a percentage.
■
Application
This function module is used for conversions from an analog
input signal to an on/off ratio with time basis 1 s. The module can
only be used in conjunction with 3RF21 and 3RF23 single-phase
solid-state switching devices or 3RF22 and 3RF24 three-phase
devices. It can be used on versions with 24 V DC and
24 V AC/DC control supply voltage.
Note:
The use of single-pole solid-state switching devices with
converters, power controllers or power regulators on AC loads in
full-wave control mode is not recommended. As mutual
synchronization of the function modules is not possible,
fluctuations in the heating power are possible; there is no
optimum settling in particular with setpoint values < 50 %.
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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
Converters
3RF2900-0EA18
Rated control supply voltage 24 V AC/DC
--
--
2
3RF2900-0EA18
1
1 unit
41C
© Siemens AG 2016