exceed 3750 rpm, etc. If the output of this function is to supply a reference to the position controller in menu 13 it must be the only user function in

menu 9 or 12 enabled. If another function is enabled the input to the position controller will only change every 8 ms (i.e. every 2 samples of

the position controller) and the speed reference applied to the drive could be very noisy.

The following diagram shows how the variable selector in Sectional control mode can be used to provide a position reference for the drive and act as

a source for encoder simulation to give the position reference for the next drive in the system.

Input

SM-Universal

reference

Encoder Plus

module

Output

reference

The input reference is provided by the previous drive in the system via the SM-Universal Encoder Plus module and is used as the position source

(Pr 12.08) for the variable selector. The destination of the variable selector is the local position reference for the menu 13 position controller

(Pr 13.21). Pr 13.21 counts up or down based on the delta position from the variable selector and rolls over or under at 65535 or 0. If the controller is

set up to ignore the local reference turns then Pr 13.21 can be used as the position controller reference.

If Pr 13.21 is also used as the encoder simulation source the local reference can also be used to give the reference for the next drive in the system.

With this arrangement a ratio is provided between the input reference and output reference within the variable selector. An addition ratio can be

provided within the position controller between the position in Pr 13.21 and the position reference used by the position controller. The variable

selector speed reference can be used to move the position reference forwards or backwards with respect to the input reference.

5.13.3

Brake control function

The brake control function can be used to control an electro-mechanical brake via the drive digital I/O.

12.40

Brake release

Bit

Coding

Update rate

Background read

This parameter should be used as a source for a digital output to control an electro-mechanical brake. This parameter is one to release the brake and

zero to apply the brake. Digital I/O can be automatically configured to use this parameter as a source (see Pr 12.41).

Brake controller enable

12.41

Coding

Bit

Range

0 to 3

Default

Update rate

Read on drive reset

0 = dis

The brake controller is disabled and no other drive parameters are affected by the brake controller. When this parameter is changed from a non-zero

value to zero the following parameters are set to zero: Pr 2.03, Pr 6.08, Pr 13.04 and Pr 13.10 (if Pr 12.49 = 1).

1 = rel

The brake controller is enabled with I/O set up to control the brake via the relay output T51/T52. Drive OK is re-routed to digital I/O 2 (T25).

2 = d IO

The brake controller is enabled with I/O set up to control the brake via digital I/O 2 (T25).

3 = User

The brake controller is enabled, but no parameters are set to select the brake output.

The following tables show the automatic parameter changes that occur to set up digital I/O2 (T25) and the relay output (T51/52) after drive reset when

Pr 12.41 has been changed. The changes are done in two stages: the first stage restores the I/O used as defined by the initial setting of Pr 12.41 and

the second stage sets up the I/O as defined by the new setting of Pr 12.41.

Mentor MP Advanced User Guide

Issue Number: 4

format

Parameter description

Source

Pr 12.08 =Pr x.05

Variable selector

in sectional control

mode

Encoder simulation source

Pr x.24 = Pr 13.21