User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 39 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
ID Chip Detection
The piezo stage which is connected to the E-727 may contain an ID-chip (located in the stage
connector). The following data is stored in the ID-chip (and cannot be modified there by the
customer):
Stage type
Serial number of the stage
Calibration data
Servo-control data (dynamic tuning, load dependent)
When a stage with ID-chip is connected to the controller for the first time, the stage parameters
from the ID-chip will be written to nonvolatile and volatile memory upon controller power-on or
reboot. Afterwards, the complete set of ID-chip parameters will be overwritten on power-on or
reboot only if the
Power Up Read ID-Chip
option is enabled via the corresponding parameter (ID
0x0f000000) for all input signal channels associated with the stage. By default, this option is
disabled to facilitate maintaining optimized parameter settings on the controller.
INFORMATION
When you connect a stage when the controller is powered on, the ID-chip of the stage is not read
by the controller. To read the ID-chip data, the controller must be power-cycled or rebooted using
the RBT command or the corresponding host software functions.
A piezo stage can be easily exchanged due to the functionality of the ID-chip. For further details,
see p. 131.
Overtemp Protection
INFORMATION
E-727 is equipped with a fan that is automatically switched on when necessary.
A sensor detects the internal temperature of the E-727. Based on the values measured by the
sensor, the E-727 supports the following temperature thresholds for overtemp protection of the
amplifier:
E-727.xxxP and .xxxAP models for higher output current only: Temperature
threshold 1 (“alert threshold”): 66 °C
All E-727 models: Temperature threshold 2 (“switch-off threshold”): 72 °C
If the sensor value exceeds threshold 2, the amplifier output is switched off automatically, and all
axes are switched to open-loop control.
Use the DIA? command to query if a threshold is exceeded and if the amplifier output is active.
Possible measures to avoid overheating:
Observe the installation instructions (p. 47).
With high output power, keep the ambient temperature below 35 °C.
If the sensor value exceeds threshold 1: Reduce the output power of the E-727 by
reducing the frequency and/or the amplitude in dynamic operation. Ensure
adequate ventilation.
If the sensor value exceeds threshold 2: Stop the wave generator. Let the system
cool down. Ensure adequate ventilation.