Page 46/169 AFNZPxxx – DUALACE2 NEW GENERATION – User Manual
external freewheeling diodes must be applied over the inductive loads supplied
by the open drain outputs.
Up to 1.5 Arms continuous (hold) current and 1.7 A peak current.
Individual hardware for detection of shorted driver, open driver and open
coil.
Self-protected against overload condition.
Dithering feature thanks to a low amplitude current modulation at high
frequency (see paragraph 8.2.6).
Dithering is typically used when controlling proportional valves in order to
create microscopic movements in the valve to prevent it from “sticking”.
Successful dithering improves the valve response for small changes.
Dithering frequency is available in fixed steps:
20.8, 22.7, 25.0, 27.7, 31.2, 35.7, 41.6, 50.0, 62.5, 83.3.
Dithering current amplitude can be adjusted up to 13% of reference value.
Actual dithering amplitude is dependent on load inductance.
Protection
The auxiliary outputs are protected against inductive discharge with internal
freewheeling diodes on pin PIN A24.
The auxiliary outputs are not protected against reverse polarity of the battery. A
way to avoid a failure caused by the polarity inversion is to activate the contactor
only when the voltage over the DC-bus capacitors has reached the accepted pre
charge level (see picture in section 3.1.1).
Built-in diagnostics:
- Overcurrent;
- Shorted driver;
- Open driver;
- Open coil (only for PWM current-controlled outputs).
Refer to chapter 10 for more details about alarms.
PWM shall only be used for inductive loads such as relays, contactors, motor
brakes or hydraulic valves
When driving inductive loads on PWM Open drain outputs there must
always be a path for the current to the freewheeling diodes. Do not connect
any switch or fuse in series with the diode.
Connector position
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A25
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