Hubner FGH 8 Product guide

English
Translation of the original Operating and Assembly Instructions FGH8_MANUAL-en_R6(2018-11-19)ID74584.docx
ID 74584
Operating and Assembly Instructions
Incremental hollow shaft encoder FGH 8
Read the operating and assembly instructions prior to
assembly, starting installation and handling!
Keep for future reference!

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Trademark
Brand names and product names are trademarks or registered trademarks of their respective owner.
Protected trademarks bearing a ™ or ®symbol are not always depicted as such in the manual.
However, the statutory rights of the respective owners remain unaffected.
Manufacturer / publisher
Johannes Hubner
Fabrik elektrischer Maschinen GmbH
Siemensstraße 7
35394 Giessen
Germany
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.huebner-giessen.com
Headquarters: Giessen
Court of registration: Giessen
Commercial register number: HRB 126
The manual has been drawn up with the utmost care and attention. Nevertheless, we cannot exclude
the possibility of errors in form and content. It is strictly forbidden to reproduce this publication or parts
of this publication in any form or by any means without the prior written permission of
Johannes Hubner Fabrik elektrischer Maschinen GmbH.
Subject to errors and changes due to technical improvements.
Copyright © Johannes Hubner Fabrik elektrischer Maschinen GmbH
All rights reserved.

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Directory
1General............................................................................................................................ 5
1.1 Information about the Operating and Assembly Instructions....................................... 5
1.2 Scope of delivery ....................................................................................................... 5
1.3 Explanation of symbols.............................................................................................. 5
1.4 Disclaimer.................................................................................................................. 6
1.5 Copyright ................................................................................................................... 6
1.6 Guarantee terms........................................................................................................ 6
1.7 Customer service....................................................................................................... 6
2Safety............................................................................................................................... 6
2.1 Responsibility of the owner ........................................................................................ 6
2.2 Intended use.............................................................................................................. 6
2.3 Improper use.............................................................................................................. 7
2.4 Personal protective equipment................................................................................... 7
2.5 Personnel................................................................................................................... 7
2.6 Special dangers......................................................................................................... 8
2.6.1 Electrical current.................................................................................................... 8
2.6.2 Rotating shafts / Hot surfaces................................................................................ 8
2.6.3 Safeguarding against restart.................................................................................. 8
3Technical Data ................................................................................................................ 9
3.1 Type plate.................................................................................................................. 9
3.2 Electrical and mechanical data................................................................................... 9
3.3 Type code.................................................................................................................12
4Transport, packaging and storage ...............................................................................13
4.1 Safety instructions for transport.................................................................................13
4.2 Incoming goods inspection........................................................................................13
4.3 Packaging / disposal.................................................................................................13
4.4 Storage of packages (devices)..................................................................................13
5Installation and commissioning....................................................................................14
5.1 Safety instructions.....................................................................................................14
5.2 Mounting of the encoder (mechanical) ......................................................................14
5.2.1 Mounting Instruction for hollow shaft encoder.......................................................14
5.3 Connecting the encoder............................................................................................16
5.3.1 Connections .........................................................................................................16
5.3.2 Technical note......................................................................................................17
6Dismantling....................................................................................................................17
6.1 Safety instructions.....................................................................................................17
6.2 Dismantling the encoder ...........................................................................................17
7Faults..............................................................................................................................18
7.1 Faults table...............................................................................................................18

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8Inspections.....................................................................................................................19
8.1 Safety instructions.....................................................................................................19
8.2 Maintenance information...........................................................................................19
8.3 Inspection schedule ..................................................................................................19
9Disposal..........................................................................................................................20
9.1 Disposal procedure...................................................................................................20
10Dimension drawings......................................................................................................21
11Connections...................................................................................................................28

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1General
1.1 Information about the Operating and Assembly Instructions
These Operating and Assembly Instructions provide important instructions for working with the device.
They must be carefully read prior to starting all tasks, and the instructions contained herein must be
followed.
In addition, applicable local regulations for the prevention of industrial accidents and general safety
regulations must be complied with.
1.2 Scope of delivery
Incremental hollow shaft encoder FGH 8, Operating and Assembly Instructions.
1.3 Explanation of symbols
Warnings are indicated by symbols in these operating and assembly instructions. The warnings are
introduced by signal words that express the scope of the hazard.
The warnings must be strictly heeded; you must act prudently to prevent accidents, personal injury, and
property damage.
WARNING!
Indicates a possibly dangerous situation that can result in death or serious injury if it is not
avoided.
CAUTION!
Indicates a possibly dangerous situation that can result in minor injury if it is not
avoided.
CAUTION!
Indicates a possibly dangerous situation that can result in material damage if it is not
avoided.
NOTES!
Indicates useful tips and recommendations as well as information for efficient and trouble-
free operation.
NOTES!
Do not use a hammer or similar tool when installing the device due to the risk of damage
occurring to the bearings or coupling!
DANGER!
Life-threatening danger due to electric shock!
Indicates a life-threatening situation due to electric shock. If the safety instructions are not
complied with there is danger of serious injury or death. The work that must be executed
should only be performed by a qualified electrician.

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1.4 Disclaimer
All information and instructions in these Operating and Assembly Instructions have been provided under
due consideration of applicable guidelines, as well as our many years of experience.
The manufacturer assumes no liability for damages due to:
Failure to follow the instructions in the operating and assembly instructions
Non-intended use
Deployment of untrained personnel
Opening of the device or conversions of the device
In all other aspects the obligations agreed in the delivery contract as well as the delivery conditions of
the manufacturer apply.
1.5 Copyright
NOTES!
Content information, text, drawings, graphics, and other representations are protected
by copyright and are subject to commercial property rights.
It is strictly forbidden to make copies of any kind or by any means for any purpose other
than in conjunction with using the device without the prior written agreement of the
manufacturer. Any copyright infringements will be prosecuted.
1.6 Guarantee terms
The guarantee terms are provided in the manufacturer’s terms and conditions.
1.7 Customer service
For technical information personnel is available that can be contacted by telephone, fax or email.
See manufacturer’s address on page 2.
2Safety
DANGER!
This section provides an overview of all the important safety aspects that ensure
protection of personnel, as well as safe and trouble-free device operation.
If these safety instructions are not complied with significant hazard can occur.
2.1 Responsibility of the owner
The device is used in commercial applications. Consequently the owner of the device is subject to the
legal occupational safety obligations and subject to the safety, accident prevention and environmental
protection regulations that are applicable for the device’s area of implementation.
2.2 Intended use
The device has been designed and constructed exclusively for the intended use described here.
Series FGH 8 Incremental hollow shaft encoder are used for measurement of rotations, for instance of
electrical and mechanical drives and shafts.
Claims of any type due to damage arising from non-intended use are excluded; the owner bears sole
responsibility for non-intended use.

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2.3 Improper use
Do not use the device in potentially explosive areas.
The device must not be subjected to mechanical loads in addition to its own weight and
unavoidable vibration and shock loads that arise during normal operations.
Examples for non-permitted mechanical loads (incomplete list):
-Fastening transport or lifting tackle to the device, for example a crane hook to lift a
motor.
-Fastening packaging components to the device, for example ratchet straps, tarpaulins
etc.
-Using the device as a step, for example by people to climb onto a
motor.
2.4 Personal protective equipment
For tasks such as assembly, disassembly or commissioning the use of personal protective equipment
such as safety footwear and protective work clothing is required.
The regulations specified by the owner and that are locally specified apply.
2.5 Personnel
Installation and commissioning as well as disassembly routines must be carried out by skilled technical
staff only.

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2.6 Special dangers
Residual risks that have been determined based on a risk assessment are cited below.
2.6.1 Electrical current
DANGER!
Life-threatening danger due to electrical shock!
There is an imminent life-threatening hazard if live parts are touched. Damage to
insulation or to specific components can pose a life-threatening hazard.
Therefore:
Immediately switch off the device and have it repaired if there is damage to the insulation
of the power supply.
De-energize the electrical equipment and ensure that all components are connected for
all tasks on the electrical equipment.
Keep moisture away from live parts. Moisture can cause short circuits.
2.6.2 Rotating shafts / Hot surfaces
WARNING!
Danger of injury due to rotating shafts and hot surfaces!
Touching rotating shafts can cause serious injuries.
Therefore:
Do not reach into moving parts/shafts or handle moving parts/shafts during operation.
Close to protect from injury all access openings in flanges with the corresponding plug
screw, and provided you exposed rotating components with protective covers.
Do not open covers during operation. Prior to opening the covers ensure that all parts
have come to a standstill.
The encoder can become hot during prolonged use.
In case of contact, risk of burns is existing.
2.6.3 Safeguarding against restart
DANGER!
Life-threatening danger if restarted without authorization!
When correcting faults there is danger of the power supply being switched on without
authorization.
This poses a life-threatening hazard for persons in the danger zone.
Therefore:
Prior to starting work, switch off the system and safeguard it from being switched on again.

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3Technical Data
3.1 Type plate
The figure below shows an example of a nameplate:
Encoder with 2 terminal boxes
The type plate is located on the outside of the housing and contains the following information:
Manufacturer, Address
Type, Year of construction
CE marking
Serial number (S/N)
Commission number (C/N)
Pulse rate
Protection class
Power supply
3.2 Electrical and mechanical data
Pulse rates
Value
Preferred Pulse Rates
1024, 2800, 4096
Special pulse rates
600, 720, 750, 1000, 1200, 2048, 2560
Connection data
Supply voltage
12 V to 30 V DC (option 5 V DC) Ripple max. 10 %
No load-current
approx. 100 mA at 30 V (without Option)
Outputs 1)
Push-pull final stages, resistant to short-circuit
Pulse height (HTL)
approx. as supply voltage, special output:
Output current
50 mA per output
Internal resistance
50 Ωper output
Slew rate
50 V / µs
1) Special output voltage 5V
(specify on order)
Supply voltage: 12 V to 20 V DC or 20 V to 30 V DC
Outptus: push-pull output stages with inverted signals.
Pulse height: 5 V to RS 422.

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Pulse duty factor
1 : 1 ± 5 %
Square wave displacement 0°, 90°
to 50 kHz < 3 %
to 150 kHz < 5 %
Max. frequency
0 to 100 kHz (150 kHz on request)
Encoder temperature ranges
Standard
0°C to + 70°C
Special temperature ranges
-25°C to + 85°C
Special output voltage 5V (TTL)
Pulse height
5V, RS422-compatible (TIA/EIA-Standard)
Supply voltage
12 to 30 V DC
Ambient temperature
The max. permissible ambient temperature depends on the speed and degree of protection of the
device.
Protection class
acc. to
DIN EN 60529
Sealing
Mechanical
speed
Description
Breakaway torque
IP 54
Special seal
≤3000 rpm
Protection against
dust and water
spray
aprrox. 20 to 60 Ncm
IP 56**
both sides
Radial shaft
seal
≤1200 rpm
Protection against
dust and water
spray
approx. 60 Ncm
IP 66
Radial shaft
seal
Protection against
dust and water
spray
approx. 70 –100 Ncm
**Higher speed on request. Seals and attachments increase the breakaway torque.
Only DE side with gasket of radial shaft / NDE side with cover / Sealing or overall protection class
IP 56 feasible.
DE = drive end side, NDE = Non drive end side
Weight
Type EK
Type EEK
approx. 13 kg
approx. 14,2 kg

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Signal outputs
Basic version (n = pulses/revolution)
One pulse channel (basic) with n direct square
wave pulses, corresponding to the segment
division and LED monitoring output. (optional).
Option 90
2nd pulse channel as basic version, but with 90°
electrical phase shift.
Option N / N2
Marker pulse, mechanically fixed. One square
wave pulse per revolution.
Option G
Additional inverted output signals for basic and
90°channels, marker pulse pulse LED check.
Option F
With 2 or 4 times as many pulses as the basic
version.
No direction of motion can be derived from the
multiple number of pulses.
Required: Option 90°
Option B
Fast and precise sensing of rotational direction
at each edge of the basic and 90°channels,
Required: option 90°.
Output
L
R
cw
0
1
Option
B, B2
ccw
1
0
Still stand
0
0
Option B2
Option B2
As option B, but with standstill sensing.
Option V
Electronic pulse doubling of basic and
90°channels by multiple evaluation.
Option L
Power output up to 150 mA for basic channel,
90° channel and the corresponding inverted
signals.
Option J
Reduced rotational frequency modulation by
means of optically adjusted pulse disk.
Option S
Electronic overspeed switch with 2
programmable switching outputs, EGS4 version.

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3.3 Type code
FGH
I
8
EK
1000
G
90G
NG
2F
S
J
40P
Incremental hollow shaft encoder
Encoder with insulating sleeve
Series
Connection method
2x connection = redundant encoder
z.B. EEK: 2x terminal box
EK/EEK: terminal box
ES/EES: EMC industrial plug
ER/EER: 12-pole. round plug
EC/EEC: 2 m connection cable
Pulses per revolution
Basic signal output
Basic channel 0° (A)
Pulse channel 90° (B)
Each with inverted signals
NG: Option reference pulse with inverted signal
2F: Option 2F
4F: Option 4F
B: Option B
B2: Option B2
S: Option S (EGS 4 technic in the second scanning head)
L2: Option L2
V: Option V
J: Option J (J can be combined with V)
Hollow shaft bore
Only with hollow shafts
Ø 42 … Ø 80
Drive shaft connection
P: feather key way
K: clamping
S: spieth pressure sleeve
C: taper

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4Transport, packaging and storage
4.1 Safety instructions for transport
CAUTION!
Material damage caused by improper transport!
Observe the symbols and information on the packaging:
Do not throw - risk of breakage
Keep dry
Do not expose to heat above 40 °C or direct sunlight.
4.2 Incoming goods inspection
Check delivery immediately upon receipt for completeness and possible transport damage.
Inform the forwarder directly on receipt of the goods about existing transport damages (prepare pictures
for evidence).
4.3 Packaging / disposal
The packaging is not taken back and must be disposed of in accordance with the respective statutory
regulations and local guidelines.
4.4 Storage of packages (devices)
Keep dry
Keep packages dry and free from dust; protect from moisture.
Protect against heat
Protect packages from heat above 40 °C and direct sunlight.
If you intend to store the device for a longer period of time (> 6 months) we recommend you use
protective packaging (with desiccant).
NOTES!
Turn the shaft of the device every 6 month 10 times to prevent a possible hardening of
the grease-filling of the ball bearings, which may lead to the destruction of the device.

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5Installation and commissioning
5.1 Safety instructions
Personnel
Installation and commissioning must be carried out by skilled technical staff only.
NOTES!
Observe the safety instructions contained in Chapter 2 when installing or working on the
device!
5.2 Mounting of the encoder (mechanical)
Mounting and disassembly by means of a hammer or similar tools in not permitted (warranty void).
5.2.1 Mounting Instruction for hollow shaft encoder
1. Adapter flange has to be mounted and to be aligned by dial gauge, if necessary optimize by
ball thrust adjusting screws.
2. Ball thrust screws to be fastened with Loctite, remove non-fastened screws of fasten with
Loctite! Max. torque for M12 approx. MD 25 Nm / M16 approx. MD 35 Nm.
The hollow shafts has tapped holes on both sides at the front. For removal use screws to attach the
mounting sleeve, and then use a puller to draw off the unit. A suitable mounting sleeve is
recommended for each plant area (specify on ordering). Remove hollow shaft encoders using
mounting sleeve only:
Fig. 1
Fig. 2

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NOTES!
The radial deviation of the shaft ( Fig. 2) should not exceed 0,05 mm.
3. Use feather keys in accordance with DIN 6885.
4. Mount the torque bracket / torque arm on the housing.
NOTES!
Comply with the information provided in the supplemental data sheet entitled “Mounting
Accuracy of hollow shaft encoders”.
5. Check the mounting position relative to the terminal box, adjust if necessary.
6. Push the device onto the shaft that has been lightly greased.
CAUTION!
Danger of damage to shaft and device if improperly handled.
Ensure that there are no hard impacts on hollow shaft and housing.
Use the mounting sleeve.
7. Fasten axial tensioning elements. (Screw, axial clamping shoes or flange).
8. Tighten the fastening screws on the link head of the torque bracket. Fix the nuts in place with
locknuts.
9. Check the attached torque brackets:
The link rod must be easy to turn within the link head, and the link heads should not tilt. If this
instruction is not followed there is a danger of bearing damage.
10. Connect the cabling in the terminal box ( Appendix, connecting diagrams).
Mounting / removal sleeves for standard bores
FGH 8..
Drg. no. E-52 443a
FGH 8 / B 14
Drg. no. E-52 760
Only mounting sleeve

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5.3 Connecting the encoder
5.3.1 Connections
Cable glands are closed with a stopper to protect the devices on transport and storage.
Cable connections:
Have to be executed according to the encoder type.
Connection diagrams have to be considered!
Use of connection cables with diameter of min. 17.5 mm –max. 20 mm is essential to ensure the
protection class. Cable outlet should show preferably downwards.
Option:
R: 12 - pole round plug.
S: Industrial plug
C: Connection cable
Wiring arrangement and shielding
(EMI measurement)
The cable shielding must be placed on both sides.
The shield of the signal cable has to be connected directly to the housing of the encoder by the cable
gland.
You must observe applicable EMC guidelines when routing cables.
Special note!
The connection must be carried out by skilled technical staff only.
Closing the terminal box cover:
Check the seal of the terminal box cover, clean it if soiled. Then duly close the cover.
Note!
Cable must not be pinched.
Attention with open terminal boxes:
Moisture should not get into the terminal box when connecting the cable.
Print-wedges with
operating whip
Cable gland with
plastic pins
Captive fastening
screws
Terminal boxes seal
Terminal box

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5.3.2 Technical note
Ambient temperature
The permissible ambient temperature depends on the speed and degree of protection (shaft seal) of
the device and the frequency, the signal cable length and mounting situation.
See chapter 3.2
Degree of protection
To fulfill degree of protection requirements the diameter of the connection cable must correspond to
that of the cable gland. Please refer to Chapter 5.3.1.
6Dismantling
6.1 Safety instructions
Personnel:
Dismantling must be carried out by skilled technical staff only.
Observe the safety instructions contained in Chapter 2 when dismantling the device!
6.2 Dismantling the encoder
To dismantling the encoder follow the instructions give in chapter 5.2 in the reverse order.

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7Faults
7.1 Faults table
Faults
Possible cause
Remedy
Moisture in the terminal box
Soiled terminal box gasket or
seal surfaces
Clean terminal box gasket and
seal surfaces
Damaged terminal box gasket
Replace terminal box gasket
Cable gland/blanking plug not
tightened
Tighten cable gland/blanking
plug
Unsuitable cable for cable gland
Use suitable cable and cable
glands
No output signals
Supply voltage not connected
Connect supply voltage
Connection cable reversed
Wire correctly
Output signals subject to
interference
Unsuitable cable
Use data cable with conductors
arranged as twisted pairs and
common shield
Cable shield not connected
Connect cable shield at both
ends
Cable routing not EMC
compliant
Observe applicable EMC
guidelines when routing cables
Signal interruptions
Signal end stage overloaded
Check pin assignment; observe
connection diagram
Do not assign unused outputs
Outputs short-circuited
Do not connect outputs with
supply voltage or GND
Contact Hubner-Service (page 2) if none of the remedies listed above provides a solution)!

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8Inspections
8.1 Safety instructions
Personnel
Skilled technical staff only are permitted to inspect the device and its installation.
Observe the safety instructions contained in Chapter 2 when inspecting or working on the
device.
8.2 Maintenance information
The device is maintenance-free. However, to guarantee optimum fault-free operations we recommend
that you carry out the following inspections.
8.3 Inspection schedule
Interval
Inspections
Tasks
All 12 month
Check coupling
Qualified person
All 12 month
Check the fastening screws for firm
seat
Qualified person
Check the cable connections
Qualified person
After approx. 16000 to
20000 operating hours and
high long-term loading
Check deep-groove ball bearing for
ease of movement and noise.
Qualified person
Worn ball bearings have to be replaced
only by the Manufacturer
Hubner –Giessen Service

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9Disposal
9.1 Disposal procedure
The manufacturer is not obliged to take back the device.
The device is classed as electronic equipment and subject to the WEEE Directive; observe local,
country-specific laws when disposing of the device.
For information on environmentally sound disposal please contact your local authority or a specialist
disposal company.