AFDZP0BA – VCM Zapi 2uC - User Manual
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4 SPECIFICATION FOR THE I/O INTERACES
The VCM inverter needs some external parts in order to work. The following
devices complete the kit for the VCM installation.
4.1 Digital inputs
Related command devices (microswitches) must be connected to positive
(typically to key voltage).
Functional devices are Normally Open; so related function becomes active when
the microswitch closes.
Safety devices (like CUTBACK switches) are Normally Closed; so related
function becomes active when the microswitch opens.
Pull-down resistances are built-in.
Some inputs are read by both master microcontroller and the slave
microcontroller:
The safety level related to these input signal is higher since both microcontrollers
check the status of the input pins.
4.1.1 DI1 ÷ DI11 technical details
Nominal Voltage [V]
36-48V
80V
Input resistance [
Ω
]
11,2k [±0,5kOhm] 3,2k [±0,1kOhm]
Maximum Input Voltage [V]
60V
24V
Logic level
High
High
High-level [V] min.
13
9
Low-level [V] max.
12
8
4.1.2 Microswitches
-
It is suggested that microswitches have a contact resistance lower than
0,1Ohm and a leakage current lower than 100µA.
-
When full load connected, the voltage between the key switch contacts must
be lower than 0.1V.
-
If the microswitch to be used has different characteristic, it is suggested to
discuss them and their application with Zapi technicians.
4.2 Analog inputs
The analog units can consist of potentiometers or Hall effect devices.
They could be in a 3-wire configuration. The potentiometers can be supplied
through PPOT1, PPOT2 or PPOT3 (CNA#33, CNA#34 or CNB16) and the output
signals must be input to CPOT pins.
Potentiometer value should be in the 0.5 – 10 k
range; generally, the load
should be in the 1.5 mA to 30 mA range. Faults can occur if it is outside this
range.
The standard connection for the potentiometer is the one in the Left side of next
