FEATURES(cont'd)
Remote Serial Communication:
The controller has several methods of external
digital control. There are built-in RJ45 ports that allow RS485 serial interface for
access from external digital systems. Advanced home automation systems offer
configurable serial communication using a serial protocol. The home automation
installer can write own code blocks to operate the door system.
Overload Protection:
Much effort has gone into the software design in order to avoid overloading the
motor driver. If needed, the system will abort the current move and alert the user by
means of LCD display with an error message. In the event of the door closing and
sensing an obstruction, the door automatically retracts. This trip level when closing
is referred to in the menu as the Closing Trip Level. There is also a threshold setting
for the opening direction called the Opening Trip Level. Upon boot up, the door
moves to the HOME position switch. During this phase, there is a threshold called
Home Trip Level,
which is used to prevent the system against overload due to an
obstruction during the Homing phase. The parameters may need to be adjusted to
account for the weight, speed, and friction of each door by the user at the time of
installation. These features reduce the possibility of overheating the circuitry on the
motor driver.
The motor driver circuit board has it’s own method of current limiting as well in the
event of the motor drawing more current than necessary. There is a trim pot on the
motor driver board that is set at the factory so that above a certain current level,
the motor driver IC will temporarily go into a FAULT mode and shut down the motor
until the over current condition has been corrected. A red LED near the center of
the motor driver circuit board will turn on to indicate the FAULT state.
Fuses:
The motor driver receives power through a 2 amp slo blo fuse, which will burn out if
the motor is drawing more current than normal operation calls for. The power
supply board uses a 2 amp slo blo fuse in line to the 110/220 AC supply HOT input.
Power:
Cables from the main circuit board to the touch panels are all 5 volt DC logic.
The power supply generates 26VDC for the motor driver and motor use. It
generates 5 VDC for all other system use.
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