Specification For The Input Devices Filling Up The Installation Kit; Digital Inputs; Microswitches; Accelerator Unit - Zapi ACE3 User Manual

3 SPECIFICATION FOR THE INPUT DEVICES
FILLING UP THE INSTALLATION KIT
The ACE3 inverter needs some external parts in order to work. The following
devices complete the kit for the ACE3 installation.

3.1 Digital inputs

ACE3 digital inputs work in the voltage range [-Batt; +Batt]. Related command
devices (microswitches) must be connected to +B (typically to key voltage) or to –
B depending by input configuration (refer to pin description in the chapter 6).
Pull-down or pull-up resistance are built-in.
Functional devices (like FW, BACK, PB, ecc.) 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 microswitches opens.

3.1.1 Microswitches

- It is suggested that microswitches have a contact resistance lower than
0,1Ohm  a nd 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.

3.2 Accelerator unit

The analog input can be connected to an accelerator unit.
The accelerator unit can consist of a potentiometer or an Hall effect device.
It should be in a 3-wire configuration. The potentiometer is supplied through
CNA#2.
Potentiometer output signal must be input to CPOT (CNA#3), signal range is from
0 to 10 V.
The negative supply of the potentiometer has to be taken from CNA#9 (GND).
Potentiometer value should be in the 0.5 – 10 kΩ 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
figure (potentiometer on one end at rest) in combination with a couple of Travel
demand switches. On request it is also possible the handling in the Right side of
next figure (potentiometer in the middle at rest) still in combination with a couple
of Travel demand switches.
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