PSM Global Functions Function Scope, Basic Function - GF54.21-S-1013A

Model All (Light transporter) 

Overview 

This document contains information on:

• General 
• Function 
  • Parameterizable undervoltage detection 
  • Parameterizable run-on time 
  • Parameterizable keeping awake function 

General 

The PSM (parameterizable special module) control unit makes it possible to individually control and execute global functions such as undervoltage detection, run-on time or keep awake function as needed.

Function 

Parameterizable undervoltage detection 

The parameterizable undervoltage detection makes it possible to make the functions of the PSM control unit conditional on the on-board power supply voltage.

The thresholds and times can be set under "Global functions → Properties".

This undervoltage detection does not cancel out the function of the hardware undervoltage detection in the PSM control unit, instead it should be seen as a configurable add-on. When evaluating the on-board electrical system voltage, the system always falls back on the higher of the two voltage values applied to the two tml. 30 connections of the PSM control unit.

This ensures that undervoltage detection remains functional even if one of the connections fails.

The following three modes are determined for global undervoltage:

• "Normal"
• "Undervoltage detected"
• "Undervoltage aborted"

In the "Undervoltage detected" mode, only the "PSM signal: Undervoltage detected" signal is set to "1" in the signal pool. The functions or outputs parameterized according to the undervoltage are only deactivated in the "Undervoltage aborted" mode. The voltage thresholds as well as times for the switchover between the various modes can be parameterized.

0 s can, of course, also be specified for the times (e.g. between "undervoltage detected" and "undervoltage abort"). The signals listed in the following table are generated.

Parameterizable run-on time 

The run-on time of the PSM control unit can be set in minutes using the "Global functions → Properties" menu item. If "0" is set, the run-on is deactivated. The run-on time progresses when the vehicle is locked via the transmitter key. If the vehicle is unlocked, the run-on time is reset to the parameterized value.

The PSM control unit can enter rest mode after the parameterized run-on time has expired if it is not kept awake by other conditions, e.g. individual outputs of the PSM control unit are active.

All of the functions of the PSM control unit can still be operated during the run-on time, provided that they do not require information from CAN.

Parameterizable keeping awake function 

The PSM contains a function module which can be used to keep the PSM awake. This module can be activated via the menu item "Global functions → Properties".

Thus it is possible to prevent a rest mode of the PSM control unit although all the internal conditions required for this are met. This is important in the case of functions that require a continuously active PSM control unit and for which the time limit for the normal run-on of the PSM control unit is not sufficient.

In the event of an incorrect application the PSM control unit cannot change to rest mode, this leads to an increased quiescent current.

It is necessary to set the parameter "PSM Function "Keep Awake of PSM control unit"" to "ACTIVATED" to activate the function.

The function can then be switched on with any bit signal from the signal pool (e.g. output of a SPS block, input, etc.).

You must assign the corresponding signal to internal input "Wake the PSM control unit" using the "Signals" menu item to do so.