Zapi COMBI AC1, Руководство пользователя, Страница: 8 / 86

3 SPECIFICATION FOR THE INPUT DEVICES
FILLING UP THE INSTALLATION KIT
3.1 Digital inputs
Combi Ac1 digital inputs work in the voltage range [-B; +B]. Related command
devices (microswitches) must be connected to +B (typically to key voltage).
Pull-down resistance to –B is built-in.
Functional devices (like FW, BACK, LIFT, DESCENT, HORN, H&S, TILLER,
BELLY switches) are Normally Open; so related function becomes active when
the microswitch closes.
Safety devices (like CUTBACK, LIFTING CUTOUT switches) are Normally
Closed; so related function becomes active when the microswitches opens.
A number of Dis are input to both microcontrollers, for safety purpose (double-
check in real time). They are listed here following:
-
AMP SAAB version: A7, A5, A11, A18, A19, A20, A33, A34, A35, A6
- AMP SEAL version: A1, A20, A6, A32, A31, A19, A7, A35, A17, A29
It is recommended to connect SAFETY RELATED devices to these double-
checked inputs, in order to increase the application safety level.
3.1.1 DIs technical details – 24 V system
- Switching threshold: 3V [±0,5V]
- Input impedance: 4,7kOhm [±0,5kOhm]
3.1.2 DIs technical details – 48 V system
- Switching threshold: 3V [±0,5V]
- Input impedance: 13kOhm [±1kOhm]
3.1.3 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.
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