AFNZPxxx– DUALACE2 NEW GENERATION – User Manual Page 43/169
4.4.5 MC output
Main (or line) contactor is operated through an open-drain PWM-voltage-
controlled output.
In order to utilize the built-in freewheeling diode, the coil must be supplied with
KEY voltage, pin A3 (A1), see chapter 3.2
A nonstandard hardware configuration permits to utilize a built-in freewheeling
diode connected to pin PEB A27 (A17).
In case the vehicle design does not allow usage of the built-in freewheeling
diode, i.e. if the return path integrity cannot be guaranteed in all situations, an
external one must be applied between the coil terminals.
Output features
Up to 1 Arms continuous current (holding).
Up to 2 A peak (pulling) current for a maximum of 200 ms.
Individual hardware for detection of: shorted driver, open driver, open coil.
1 kHz default PWM frequency.
Configurable output voltage, by means of separate parameters for pulling
and holding stages.
PWM should only be used for inductive loads such as relays, contactors, motor
brakes or hydraulic valves.
PWM frequency can be changed by software. If a different PWM frequency has
to be used, it is suggested to discuss it with Zapi technicians.
Protection
Protected against inductive discharge with internal freewheeling diode to pin KEY
A3 (A1) and ESD protected by means of ESD-suppressing device. Protected
against reverse polarity of the battery.
Built-in diagnostics:
- Overcurrent
- Driver shorted
- Driver open
- Coil open
Refer to chapter 10 for more detailed description.
MC output can only be a PWM-voltage-controlled output. It cannot be used as a
current-controlled output.
When driving an inductive load on PWM open-drain output, there must
always be a path for the current through a freewheeling diode. Do not
connect any switch or fuse in series with the diode.
To Next Page
Loading...
Need help?
General
