Siemens EN 50295 manual Earth fault detection modules, 100

AS-Interface Slaves

Modules with special functions

Earth fault detection modules

■Overview ■Function

"... Earth faults in control circuits should neither lead to uninten- tional start-up nor to dangerous motion of a machine and they must not hinder shutdown of the machine (EN 60204, Part 1 or DIN VDE 0113)".

The AS-Interface earth-fault detection module has been devel- oped to ensure that these requirements can be met more easily in the future. This module from the SlimLine Series allows earth faults in AS-Interface installations to be reliably detected and re- ported.

The following earth faults are detected:

•Earth fault in AS-i "+"

•Earth fault in AS-i "-"

•Earth fault in sensors and actuators that are supplied from the AS-Interface voltage

In each case, only one module is necessary for each AS-Inter- face network.

The earth fault is detected by the module, indicated via a LED and signaled via two signaling outputs (1 = no earth fault /OK;

2 = earth fault/fault. The earth fault alarm is stored in the module. The module can only be reset after the earth fault has been rec- tified by switching off the AS-Interface voltage via a reset button or via a high signal on the floating remote-reset input. The reset button can also be used for checking correct functioning of the module. External auxiliary voltages are not monitored for earth faults by this module.

Note: The earth fault detection module is a passive module with- out an IC. Therefore it does not require an individual address in the AS-Interface network.

6

AS-i-	T
AS-i+R-RES -		1/AS-i-						1/AS-i-
AS-i		4/AS-i+						4/AS-i+
TEST/		2/		Alternatively	Automatictest
RESET
R-RES		3/T	PE	+	+	Output	5k6	5k6
		3/RRES		Output	Output	AS-ifault-
				RRES	RRES
		6/-				Output
				-	-
		7/L24+		PLC	PLC AS-ifault+
O.K.
				Input	Input			PE
FAULT
		8/OK
				O.K.	O.K.
		9/FAULT		Input	Input
			+	FAULT	FAULT
		12/M24
L24+O.K.FAULT						NSA000090a
			24V
		11/M24
			-
M24 M24 M24		10/M24		PLC	PLC
Terminal		Designation

1AS-i–connection

2Connectionforsystemearth

3Connectionforsystemearth(fortestfunction)

4As-i+connection

5Remoteresetinput(R-RES)

6Remoteresetground(–)

7ExternalvoltagesupplyforsignalingoutputsL24+

8SignalingoutputO.K.

9SignalingoutputFAULT(earthfaultsignaling)

10ExternalvoltagesupplyforsignalingoutputsM24

11NegativeconnectionforsignalingoutputM24

12NegativeconnectionforsignalingoutputM24

Typical connections

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Siemens IK PI · 2004