Description Of The Hardware - Weber PL751A Operation Manual

Weber Lifttechnik GmbH
The output G2 "No travel" can be used as a travel signal for the lift control unit. It carries a voltage
of +24V in case of a standstill of the lift car or is de-energised as soon as a main contactor is
actuated or a braking element is released at the inputs E4, E5, F3 or F4.
The output G3 carries a voltage of +24V provided the safety relay K79 is controlled by the
PL 751A.
The output G4 "Error display" provides pulses synchronously to the control of the LED "Fault"
which can be implemented by the lift control unit in a plain text error message. (See Point 4.
Error messages)

3. Description of the hardware

The PL 751A circuit board comprises of a computer core and the inputs and outputs, and is
covered by a labelling panel. On the labelling panel, all signals are designated and provided with
a terminal designation. On the PL 751A, both 230V AC as well as 24V DC inputs and a relay
contact for switching the safety circuit and standard outputs for 24V DC are provided.
PL 751A printed circuit board for recognition of unintentional movement of the lift
car with open doors
© Weber Lifttechnik GmbH
Operating Manual
Version 2.0
PL 751A
Page 7