Enable Drift Compensation (Mode 18) - Siemens SIMATIC S5 Manual

Machine Data, Modes and Traversing Programs

5.3.18 Enable Drift Compensation (Mode 18)

Enable drift compensation
Mode
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
+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
Start
Parameters
Function
The motor
rotates in the forward direction at the rated speed
rotates in the reverse direction at the rated speed
is at zero speed
IP 266
EWA 4NEB 812 6057-02