User manual

AE9ZP0BD - DUALAC2/&HP/POWER - User Manual Page - 11/89
3 SPECIFICATION FOR THE INPUT DEVICES
FILLING UP THE INSTALLATION KIT
The DUALAC2 inverter needs some external parts in order to work. The following
devices complete the kit for the DUALAC2 installation.
3.1 Microswitches
- The microswitches must have a contact resistance lower than 0.1 ohm and a
leakage current lower than 100 µA.
- When full load connected, the voltage between the key switch contacts must
be lower than 0.1 V.
- The microswitches send a voltage signal to the microprocessor when a
function request (for ex.: running request) is made.
3.2 Accelerator unit
The accelerator unit can consist of a potentiometer or an Hall effect device.
It should be in a 3-wire configuration.
CPOT (C21) signal ranges from 0 to 10 V.
Potentiometer value should be in the 0.5 - 10 kohm range; generally, the load
should be in the 1.5 mA to 30 mA range. Faults can occur if it is outside this
range.
PPOT is the accelerator unit positive supply. It can be either a 5 V output or a 10
V output. The selection of the output voltage is made in the logic card by moving
a jumper (factory set).
NPOT is the accelerator unit negative supply. This output is feedback to the µC
A/D converter to test the continuity of the accelerator unit circuit (test of poti wire
disconnection).
The Procedure for automatic potentiometer signal acquisition is carried out using
the Console. This enables adjustment of the minimum and maximum useful
signal level (PROGRAM VACC function), in either direction. This function is
unique when it is necessary to compensate for asymmetry with the mechanical
elements associated with the potentiometer, especially relating to the minimum
level.
The sequence of procedure is described in the programming console manual.