Safe stop
Instruction handbook
b maXX
BM4400, BM4600, BM4700
Document No.: 5.12008.07
341
E
C.3.2 The safety relay
The function of the safety relay is performed in fail safe technology (closed circuit principle). The
safety function „Safe stop” if no voltage is applied to the input terminals (X102-3/4; X103-3/4).
The operation of the safety function is ensured at power failure. 24V must be applied to the avail-
able terminals, to deactivate „Safe stop“ (X102-3/4; X103-3/4).
The present switching state can be obtained from the positively driven feedback contacts for the
external monitoring of the safety relay (X102-1/2; X103-1/2). If there is no voltage at the safety
relay („Safe stop“). The feedback contacts are closed (NC contact). Cable break is also detected
as an error.
The converter generates „Power unit warning 20: undervoltage safety relay“ or „Power unit error
87: error safety relay“), if the voltage at the input terminals of the relay (X102-3/4;X103-3/4) is
switched off. At inhibited pulse enable the warning „warning is not saved“ is generated and at
pulse enable the error message (errors are saved) is generated. A commissioning or enable of
drive is possible, if no error is detected in error memory. Error memory can be reset via the dig-
ital input X1/1 of the function module DIO-01. Input X1/1 must be configured accordingly. The
switch error storage can, for example, be reset over the digital input X1/1 of the function module
DIO-01. For this the input X1/1 accordingly must be configured. The starting pulse length at X1/
1 must last at least 5 ms.
Summary of Contents for b maxx BM4400
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