Siemens IP-Module Manual descargar pdf (Pagina 134)

Machine Data, Modes and Traversing Programs IP 266

5.3.18 Enable Drift Compensation (Mode 18)

Enable drift compensation

Mode

Start

Function

Parameters

Prerequisite to correct operation of the IP 266 is a properly calibrated power sec-

tion (see Table 5-17).

Table 5-17. Data for Calibrating the Power Section

Power section

input

The motor

rotates in the forward direction at the rated speed

rotates in the reverse direction at the rated speed

is at zero speed

+10 V

- 10 V

±0 V

These conditions must be regarded as ideal conditions, and cannot be attained

during operation. Drift may occur even in well-calibrated power sections due to

• tolerances in the power electronics components and

• temperature drift

You can use mode 18 to compensate for such a drift.

Prerequisites:

• The axis must be at rest ('finished' status)

• The position control loop must be closed

Drift compensation:

Select mode 18

Start mode 18 with the "Start" function.

The IP 266 now monitors the following error for approximately 4 seconds. The

following error corresponds to the drift in the power electronics. The IP 266 then

computes a voltage value proportional to the following error as setpoint speed.

When mode 18 is exited, this constant voltage is continually superimposed on the

position controller's setpoint speed.

An "External Stop" does not abort this mode.

5-62

EWA 4NEB 812 6057-02

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Siemens IP-Module Manual Pagina 134