LVPZT Amplifier Module - PI

Ordering
Information
6-47
E-621
E-621.SR
LVPZT Amplifier & Servo-Controller
Module, Strain Gauge Sensor,
RS-232 Interface
E-621.LR
LVPZT Amplifier & Servo-Controller
Module, LVDT Sensor, RS-232 Interface
E-500.621
Basic Chassis, 19”, for up to
12 Modules, Including Power Supply
E-501.621
Basic Chassis, 9.5”, for up to
4 Modules, Including Power Suppy
Technical Data
LVPZT Amplifier & Servo-Controller
Module with High-Speed RS-232 Interface
� Integrated 20-Bit High-
Speed RS-232 Interface
� Network Capability
with up to 12 Channels
� For LVDT and Strain
Gauge Position Sensors
The E-621 is a newly developed
improvement on the
E-610-series modular controller/amplifier
for low-voltage
PZTs and offers the full functionality
of that line. In addition,
the E-621 is equipped with an
RS-232 interface and command
interpreter, the submodule.
New and Fast
Communications Interface
The RS-232 interface handles
the communications with the
outside world. It performs up
to 300 read or write operations
per second and incorporates
Models E-621.SR, E-621.LR
Function Power amplifier & position servo-control of LVPZTs
Channels
Amplifier
1
Maximum output power 14 W
Average output power 6 W
Peak output current < 5 ms 140 mA
Average output current 60 mA
Current limitation Short-circuit proof
Voltage gain 10 +/- 0.1
Polarity Positive
DC-offset setting 0 to +100 V
Input Impedance 100 k�
Dimensions 7T wide, 3H high
Operating voltage 13 to 30 VDC, stabilized
Operating current
RS-232 Interface
2 A
D/A converter 20-bit resolution
A/D converter (sensor) 20-bit resolution
Baudrate 9.6 kBaud – 115.2 kBaud (default 115.2)
Wave table
Position Servo-Control
64 values, 100 Hz, externally triggered (in preparation)
Sensor types Strain gauge (E-621.SR), LVDT (E-621.LR)
Servo characteristics
Connectors
P-I analog, notch filter
PZT connector LEMO ERA.00.250.CTL
Sensor connector LEMO EPL.0S.304.HLN
Analog input SMB
Monitor output SMB
RS-232 9-pin sub-D (male)
http://www.pi.ws
info@pi.ws
E-621 Module
precision 20-bit D/A and A/D
converters for exceptional
positional stability and resolution.
The sub-module assumes
all communications tasks with
the host PC and/or with other
networked modules in the
system.
Multi-Axis Network
Communications between
several E-621s with any combination
of SGS and LVDT sensors,
is also handled by the
interface sub-module. Up to
12 modules can be networked
and controlled over a single
RS-232 interface. The different
modules are connected in parallel
(not daisy-chained) over
the link. A special chassis
(E-500.621) is available for up to
12 E-612 modules. It automatically
provides the power and
network connections to the
individual E-621 modules, so
no additional wiring is required.
Only an additional 10 ms internal
bus communications time
is required to reach any of the
units behind the one actually
connected to the host PC.
PI General Command Set
The E-621 is to a large extent
freely programmable and its
command structure conforms
to the PI General Command
Set. This command set is common
to the E-516 Piezo
Interface and Display Module
(see p. 6-58) and an increasing
number of PI controllers. All
new controllers for motors and
actuators will understand these
commands, either directly or
via command libraries. This will
greatly reduce the effort required
to produce custom programs,
especially in environments
which include a number
of different controllers. Included
with the E-621 is userinterface
software as well
LabView and other driver
sets.