PI PIFOC N-725.2A Specification sheet

Technical Note
KSch, 2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
N-725.2A PIFOC® Z-Drive with NEXACT® Linear Motor
Contents
System Description............................................................................................................2
Symbols and Typographic Conventions..........................................................................2
Intended Use.......................................................................................................................2
Safety Precautions.............................................................................................................3
Installation...........................................................................................................................3
Connecting the N-725.2A to a Protective Earth Conductor............................................................3
Fastening the N-725.2A................................................................................................................5
Start-Up and Operation......................................................................................................5
General Notes on Start-Up and Operation....................................................................................5
Starting Up and Operating the N-725.2A.......................................................................................5
Maintenance........................................................................................................................6
Cleaning the N-725.2A........................................................................................................6
Customer Service...............................................................................................................6
Technical Data....................................................................................................................7
Dimensions.........................................................................................................................8
Ambient Conditions and Classifications..........................................................................9
Old Equipment Disposal..................................................................................................10

Page 2 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
System Description
The N-725.2A PIFOC® Z-drive with NEXACT® linear motor provides 2 mm travel (closed-loop) in Z
axis, a resolution of 2 nm and features a linear encoder.
Symbols and Typographic Conventions
The following symbols and typographic conventions are used in this technical note:
CAUTION
Dangerous situation
If not avoided, the dangerous situation will result in minor injury.
Actions to take to avoid the situation.
NOTICE
Dangerous situation
If not avoided, the dangerous situation will result in damage to the equipment.
Actions to take to avoid the situation.
INFORMATION
Information for easier handling, tricks, tips, etc.
Intended Use
The N-725.2A is a laboratory device as defined by DIN EN 61010-1. It is intended to be used in
interior spaces and in an environment which is free of dirt, oil and lubricants.
Based on its design and realization, the N-725.2A Z-drive is intended for maximum pull forces of 10 N
and maximum push forces of 10 N. The N-725.2A Z-drive can be mounted horizontally or vertically.
The intended use of the N-725.2A is only possible in combination with suitable electronics that is
available from PI. The N-725.2A can be operated using the E-861.1A1 NEXACT® servo controller.

Page 3 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Safety Precautions
NOTICE
Damange due to manual displacement!
Manual displacement can cause irreparable damage to the piezo modules in the
NEXACT® linear motor.
Do not displace the moving platform of the PIFOC® Z-drive with NEXACT®
linear motor manually!
NOTICE
Fixed operation frequency for permanent operation!
For permanent operation of the drives do not exceed operation frequencies of
800 Hz.
NOTICE
Unsuitable cables!
Unsuitable cables can damage the electronics.
Only use cables from PI for connecting the N-725.2A to the electronics.
INFORMATION
Extended cables can affect the performance of the N-725.2A.
Do not use cable extensions. If you need longer cables, contact our customer
service department (p. 6).
Installation
Connecting the N-725.2A to a Protective Earth Conductor
NOTICE
Ground loops with double connection of protective earth conductor!
In the case of Z drives with Sub-D connectors, ground loops can occur when the Z
drive is grounded via its protective earth connection as well as by the shield of the
connection cable for the electronics.
If a ground loop occurs, contact our customer service department (p. 6).
The N-725.2A is grounded when it is connected to the piezo controller via its HD sub-D15m
connector. However, to comply with the 2004/108/EC, EMC Directive, a functional grounding is
required for potential equalization.

Page 4 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Tools and accessories
Suitable protective earth conductor: conductor cross-section ≥ 0.75 mm2,
insulation green/yellow
Suitable screw driver
Suitable M4 screw, two toothed washers, two flat washers
Suitable cable lug
Connecting N-725.2A to protective earth conductor
Figure 1: Mounting of protective earth connection (schematic)
1 M4 screw
2 Toothed washer
3 Flat washer
4 Cable lug
5 N-725.2A case with protective earth connection (M4 threaded hole) and protective earth
conductor symbol
6 Protective earth conductor
1. If necessary, fasten a suitable cable lug to the protective earth conductor.
2. Have the M4 screw, toothed washers and flat washers available.
3. As shown in the above figure: fasten one flat washer and one toothed washer
each above and below the protective earth conductor or its cable lug with the
screw on the protective earth connection of the N-725.2A.
4. Tighten the screw with a torque of 1.2 Nm to 1.5 Nm.
5. Make sure that the protective earth conductor of the N-725.2A is properly
connected with the existing protective earth system within your application at all
times.

Page 5 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Fastening the N-725.2A
Prerequisite
You have read and understood the safety precautions (p. 3).
Fastening the N-725.2A
Mounting:
Fasten the objective to the thread intended for this purpose.
For detailed instructions refer to the separate technical note P721T0002 for PIFOC®
QuickLock thread options.
Start-Up and Operation
General Notes on Start-Up and Operation
NOTICE
Uncontrolled oscillation!
Oscillations can cause irreparable damage to the Z-drive. Oscillations are indicated
by a humming and can result from the following causes:
The load and/or dynamics of operation differ too much from the calibration
settings.
The Z-drive is operated near its resonant frequency.
If you notice oscillations, stop the Z-drive immediately.
Starting Up and Operating the N-725.2A
Prerequisite
You have read and understood the following sections:
Safety Precautions (p. 3)
General Notes on Start-Up and Operation (p. 5)
Starting up and operating the N-725.2A
Follow the instructions in the manual of the used piezo controller for start-up and operation of
the N-725.2A.

Page 6 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Maintenance
NOTICE
Misalignment from manipulating actuator!
The N-725.2A is maintenance-free and precisely aligned.
Do not try to manipulate or to open the N-725.2A.
Cleaning the N-725.2A
Prerequisites
You have disconnected the N-725.2A from the controller.
Cleaning the N-725.2A
Clean the surface of the N-725.2A with a towel that is lightly dampened with a mild cleanser or
disinfectant, with alcohol or with isopropanol.
Do not do any ultrasonic cleaning.
Customer Service
For inquiries and orders, contact your PI sales engineer or send us an e-mail (inf[email protected]).
If you have questions concerning your system, have the following information ready:
Product codes and serial numbers of all products in the system
Firmware version of the controller (if present)
Version of the driver or the software (if present)
Operating system on the PC (if present)
The latest versions of the relevant user manuals for your system are available for download on
our website (http://www.pi.ws).

Page 7 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Technical Data
N-725.2A Unit Tolerance
Active axes Z
Motion and positioning
Integrated sensor Optical
Open-loop travel 2.5 mm ±0.2 mm
Closed-loop travel 2 mm
Min. incremental motion 5 nm typ.
Mechanical properties
Push/pull force capacity in motion
direction 10 / 10 N max.
Drive properties
Piezoceramics NEXACT ®
Miscellaneous
Operating temperature range* 0 to 50 °C
Material Aluminum
Max. objective diameter 39 mm
Mass 0.28 kg ±5%
Cable length 1.5 m ±10 mm
Sensor / voltage connection HD sub-D15f /
HD sub-D15m
*Specifications assured from 17°C to 23°C, performance may be reduced outside this range.

Page 8 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Dimensions
Decimal places are separated in commas.
Figure 2:Lateral view and top view of N-725.2A

Page 9 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Ambient Conditions and Classifications
The following ambient conditions and classifications must be observed for the N-725.2A:
Area of application For indoor use only
Maximum altitude 2000 m
Air pressure 1100 hPa to 0.1 hPa
(corresponds to roughly 825 torr to
0.075 torr)
Relative humidity Highest relative humidity 80% for
temperatures up to 31°C
Decreasing linearly to 50% relative
humidity at 40°C
Operating temperature 0°C to 50 °C
Storage temperature 0°C to 70°C
Transport temperature -20°C to 70°C
Overvoltage category II
Protection class I
Degree of pollution 1
Degree of protection
according to IEC 60529 IP20

Page 10 / 10
2013-06-13
N725T0002, valid for N-725.2A
Physik Instrumente (PI ) GmbH & Co. KG_Auf der Roemerstrasse 1_76228 Karlsruhe/Germany
Phone [phone], Fax [phone] E-mail in[email protected], www.pi.ws
Old Equipment Disposal
Since 13 August 2005, in accordance with the EU directive 2002/96/EC (WEEE), electrical and
electronic equipment can no longer be disposed of in the member states of the EU with other wastes.
When disposing of your old equipment, observe the international, national and local rules and
regulations.
To meet the manufacturer’s product responsibility with regard to this product, Physik Instrumente
(PI) GmbH & Co. KG ensures environmentally correct disposal of old PI equipment that was first put
into circulation after 13 August 2005, free of charge.
If you have old PI equipment, you can send it postage-free to the following address:
Physik Instrumente (PI) GmbH & Co. KG
Auf der Römerstr. 1
D-76228 Karlsruhe, Germany