2 Technical Description
2.5 Function principle
Manual
SIPART DR21
C73000-B7476-C143-08
33
6DR2804-8A
module with 4 DO-relays
6DR2804-8B
module with 2 DO-relays
D
Coupling relay module with 2 or 4 relays
To convert 2 or 4 binary outputs to relay contacts up to 230 V UC.
The relays can be snapped onto a mounting rail on the back of the controller. The mounting
rail is delivered with the coupling relay module.
One or two relay modules are installed per version. Each of these modules consists of two
relays with quench diodes parallel to the control winding. Every relay has a switching contact
with spark quenching in both switching branches. In AC-consumers with a very low power,
the current flowing (e.g. hold current in contactors) through the spark quenching capacitor
(33nF) when the contact is open interferes. In this case they should be replaced by capaci-
tors of the same construction type, voltage strength and lower value.
The switching contact is fed to the plug terminals with 3 poles so that the rest and working
circuits can be switched. The relays can be controlled directly from the controller’s digital
outputs by external wiring.
!
CAUTION
The relays used on the interface relay module are designed for a maximum
rating of AC 250 V in overvoltage class III and contamination factor 2 according
to DIN EN 61010 Part 1.
The same applies for the air- and creep lines on the circuit board.
Resonance increases up to double the rated operating voltage may occur when
phase shift motors are controlled. These voltages are available at the open re-
lay contact. Therefore such motors may only be controlled under observance of
the technical data and the pertinent safety conditions via approved switching
elements.
Summary of Contents for SIPART DR21
Page 1: ...SIPART DR21 C73000 B7476 C143 08 1 SIPART DR21 6DR 210 Edition 08 2010 Manual ...
Page 2: ...SIPART DR21 C73000 B7476 C143 08 2 ...
Page 148: ...4 Installation 4 2 Electrical Connection Manual 148 SIPART DR21 C73000 B7476 C143 08 ...
Page 180: ...5 Operation 5 5 CPU self diagnostics Manual 180 SIPART DR21 C73000 B7476 C143 08 ...
Page 242: ...Manual 242 SIPART DR21 C73000 B7476 C143 07 ...