Constraints for Use
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6.3
Additional constraints for LIMAX Safe SG
In order to fulfill EN 81-20 §5.6.7, there must be an electronically triggered blocking device for the
speed governor or suitable electronically driven safety gear. The stopping element for the up and down
direction respectively the double acting safety gear for the up and down direction must meet the re-
quirements of EN81-20:2014 and EN81-50:2015.
The blocking device respectively the mimics acting the safety gear must be built in such a way that the
lift movement is possible if the coil of the electromechanical part is energized. If the coil is de-
energized, lift movement must be prevented by the safety gear (directly driven or indirectly driven by
speed governor.
The mechanical part driven by LIMAX Safe SG has to control a feedback switch. The switch has to be
closed if the coil of the electromechanical part is energized. Otherwise the switch has to be open.
Maximum Voltage feedback switch input SGC-FB: 30 V DC, secured with a fuse of maximum 1 A.
In case there is safety gear, electronically driven by LIMAX Safe SG, LIMAX Safe SG fulfills EN81-20
§5.6.2.2.1.1. a.): LIMAX Safe SG is used as a monitoring device of tripping speed of car safety gear in
this case.
Contact SGC max. 150 V / 230 VAC at 50 Hz protected with a fuse of max. 1 A or 24 VDC protected
with a fuse of max. 1 A.
6.4
Special constraints for 110 V Version
Maximum lifting height of the elevator: 125 m.
In case a special condition is fulfilled the maximum lifting height of the elevator: 262 m.
The condition for a lifting height of 262 m is: it must be ensured, that there is no wire leading an AC
voltage of more than 150 V present in the lift environment. This may apply in some countries with
110 V or 100 V low voltage network.
Voltage of safety circuit must be in a range between 105 VAC and 150 VAC / 50 Hz.
The use of the Sensor LIMAX44 RED is not suitable in installations using the 110 V Version of LIMAX
Safe SG/SC.
6.5
Special constraints for 230 V Version
Maximum lifting height of the elevator with Sensor LIMAX33RED: 262 m.
Maximum lifting height of the elevator with Sensor LIMAX44RED: 786 m.
Voltage of safety circuit must be in a range between 210 VAC and 230 VAC / 50 Hz.
6.6
Prevention against external door contact bridging
In most lifts installations there are sensing connections between the door contacts, which are used as informa-
tional indicators for the control (digital input) and / or for the maintenance staff (optical indication).
Since these sensing connections are normally connected to the neutral conductor for the erroneous case applies,
that open door contacts are not bridged by a current flow over these indicator branches.
In case of the fault
break of neutral wire
door contacts may be bridged by current flow. Therefore for the fault
break of neutral
it has to apply:
The fault can be excluded due to EN81-50:2015 §5.15 or
If appearance this fault generates a current flow via parallel circuit of electrical or electronic devices to
a door contact, the appearance of this fault must set the lift to a safe state
In most cases this can be achieved by the following measure. There is a loop of the neutral conductor via the
circuit board containing indicators as shown in the picture below. In case of
break of neutral wire
the main con-
tactors fall.
