Siemens EN 50295 manual AS-Interface motor starters and IP20 load feeders, 117

AS-Interface Slaves

AS-Interface motor starters and IP20 load feeders

AS-Interface load feeder modules IP20

■Overview

AS-Interface load feeder module

The AS-Interface load feeder module serves as an additional in- put/output module for the conventional busbar and standard mounting rail adapters. It enables the control circuit of a load feeder to be completely prewired. The series has been opti- mized for use in conjunction with the SIRIUS load feeders (sizes S00 and S0). The connection to the higher-level automation sys- tem is made via the interface between the AS-Interface and the load feeder module. An unshielded, standard litz wire can be used as the data line and for the 24 V DC load power supply. The connection to the AS-Interface load feeder module is made by means of two insulation-piercing connectors.

Four different AS-Interface load feeder modules are available: The versions differ in the number of inputs and outputs, as well as in the type of outputs. The units with electronic outputs are de- signed for 24 V DC, whereas units with relay outputs are de- signed for voltages of up to 230 V AC. They enable direct-on-line and reversing starters, double direct-on-line starters and starter combinations to be wired for pole-changing. The status signals from the circuit-breakers and the contactor(s) can be interro- gated separately at the inputs. The outputs are used to control the contactor coils directly.

Since the outputs already have overvoltage protection inte- grated, additional measures are not required for the contactors.

The outputs are fed by a separate auxiliary power supply, which facilitates a selective emergency stop concept. The inputs are supplied via the AS-Interface data line. The inputs and outputs must be wired via integrated Cage Clamp terminals which are connected to a common potential.

3RA5 fuseless load feeder with connection to an AS-Interface

The 3RA5 fuseless load feeder, consisting of AS-Interface load feeder module, circuit-breaker and contactor, together with all necessary connectors (AS-Interface, auxiliary power and 5-pole power connector), is supplied completely assembled, wired and tested. This saves the user valuable time required for installation, wiring and servicing.

Also available are direct online starters and reversing starters with SIRIUS switchgear of sizes S00 up to 10 A and size S0 - de- termined by the power connector - for up to 16 A. The complete feeder units are available with AS-Interface load feeder modules with electronic outputs for an auxiliary voltage of DC 24 V.

Load feeder units of this kind are used, for instance, to control standard three-phase motors. The load feeders can be installed in central switchgear cubicles or in distributed, onsite switch- gear boxes. They are particularly suitable for machines and plants where the degree of automation is high and special im- portance is attached to availability.

■Design

The AS-Interface load feeder module is snapped onto a match- ing support for switching devices. A 5-pole power supply con- nector can optionally be fitted between the load feeder module and the support.

If this connector is used, all the load feeder connections are of 6 the plug-in type. The unit can thus be replaced very easily if nec-

essary. If this connector is used, the current is limited to 16A.

Several versions of the controlgear support are available; the choice depends on the width of the controlgear combination (45 mm or 54 mm) and on the busbar system which is used (bus- bar center-line spacing 40 mm or 60 mm). Depending on the variant, the N and/or PE conductors or neither conductor is brought out as well. The connecting cables of the loads can thus be prefabricated beforehand and laid directly to the AS-Inter- face load feeder module via the optional power supply connec- tor, then installed at this module without any additional wiring. The loads, for example a three-phase standard motor, can be exchanged easily in this way.

Each AS-Interface bus station must be assigned a unique ad- dress at the commissioning stage at the latest. In the case of the AS-Interface load feeder module, this can be achieved either via the master by plugging in the connectors which are connected to the data line one at a time (only one station in the network is allowed to respond to the default address 0), or by allocating in- dividual addresses by means of the addressing device and line. This addressing method can still be used even if the compact starter is fully wired, as the module is disconnected from the AS-Interface network as soon as the addressing connector is inserted.

The addressing socket is located underneath the item code plate on the front of the load feeder module. The LEDs for diag- nosing the AS-Interface load feeder module are also situated there. The following states are displayed:

•24 V DC auxiliary voltage present or output/outputs set

(230 V AC version)

•AS-Interface communication o.k.

•AS-Interface communication fault

•Station address = 0 (module not addressed)

Siemens IK PI · 2004

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