Heras HGD230, User Manual

Page: 51 / 146

EN – Translation of the original user manual - 2.1 | 2019 51
Illustration 25: Connecting external devices
6.1.5 Power supply for external devices with 24Vdc
To supply power to the external sensors and controls, the HMD230 features a 24
V
DC
power supply with potential separation and voltage stabilisation which can
supply a maximum current of 500 mA. The supply voltage is fused with an
automatically resetting fuse on the PCB. Devices can also be connected to the
backplane; see appendix B and C.
6.2 CONNECTING THE CONTROLS
The controls (keys) for the open, close, toggle and part open functions are
connected through a make contact. Switches with a static make contact (e.g.
timer) are also allowed for the open and part open functions. Contacts can also be
connected to the backplane; see appendix B and C.
Only controls with a break contact are used for the stop, emergency stop and
emergency situation functions.
ATTENTION: The power supply to the controls must go through the
synchronised 24V ¯|_|¯ output for the emergency stop and emergency
situation functions.
Several break contacts can be switched in series in the form of a stop chain for
the stop and emergency stop inputs.
To comply with the special requirements set on dead man's operation, the inputs
"In7" and "In8" may only be assigned to pushbuttons, the operation of which
guarantees a complete view of the door system and safe use. These settings
cannot be changed while programming.