Motec PDM30 User Manual download pdf (Page 13)

10 Installation

- Set the High Time and Low Time to 0.00s in the park switch input pin

configuration so that the wiper is parked as soon as possible after

reaching the park position.

An sample configuration for this method is included with PDM Manager.

Note: Version 2 hardware is indicated by the symbol 2 next to the engraved

serial number on the PDM case.

Solenoids

The current drawn by a normal single coil solenoid ramps up from zero to its

steady state value over a period of time. The time taken to do this depends on

the inductance and resistance of the solenoid but is normally very short (less

than 0.1 second). This has no effect on the PDM.

A solenoid will generate a voltage spike when turned off; this is clamped and

absorbed by the PDM. The amount of energy absorbed by the PDM depends

on the inductance and current in the solenoid. The PDM is capable of

absorbing the energy of most normal solenoids in a vehicle.

Two Stage Solenoids

Some solenoids have two windings; one is used to turn the solenoid on, the

other is used to hold it on once it has switched. This ensures optimum turn on

characteristics with minimum holding current.

The current drawn by the turn on winding may be higher than the current

drawn by the holding winding. Ensure the Output Load is well clear of 100%

during turn on and during holding.

Starter Solenoids

In many cases it is possible to run starter solenoids from a single 20 Amp

output even though they typically draw more than 20 ampere (possibly as

much as 40 ampere).

The Over-Current Shutdown feature allows excess current for a period of

time. This feature will shut down the output after about 10 to 20 seconds of

cranking. See the Over-Current Shutdown section for details.

The wire can be rated for 20 ampere, also ensuring that the starter motor

does not overheat during excess cranking. A larger wire gauge might be

required if the voltage drop is not acceptable.

Alternatively two 20 Amp outputs may be paralleled allowing cranking for any

period of time (subject to overheating of the starter motor).

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Motec PDM30 User Manual Page 13