NSK IHN080 User manual

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Table of Contents
Chapter����������������������������������������������������������������������������������������������������������������������������������������������� Page
Safety Recommendations������������������������������������������������������������������������������������������������������������������������3
1 Introduction��������������������������������������������������������������������������������������������������������������������������������������3
1�1 Intended Use������������������������������������������������������������������������������������������������������������������������������������3
1�2 Principle of Operation����������������������������������������������������������������������������������������������������������������������4
1�3 Distinguishing Feature���������������������������������������������������������������������������������������������������������������������4
2 Description ���������������������������������������������������������������������������������������������������������������������������������������4
2�1 Components�������������������������������������������������������������������������������������������������������������������������������������4
2�2 Technical Data����������������������������������������������������������������������������������������������������������������������������������5
3 Installation of Mains Plug ���������������������������������������������������������������������������������������������������������������5
4 Preparation for Use��������������������������������������������������������������������������������������������������������������������������6
5 Operation������������������������������������������������������������������������������������������������������������������������������������������7
5�1 Function of Displays ������������������������������������������������������������������������������������������������������������������������7
5�2 Function of Buttons �������������������������������������������������������������������������������������������������������������������������8
5�3 Temp Mode��������������������������������������������������������������������������������������������������������������������������������������8
5�4 Time Mode���������������������������������������������������������������������������������������������������������������������������������������9
5�5 Temperature Measurement ������������������������������������������������������������������������������������������������������������9
5�6 Change of Temperature Unit�����������������������������������������������������������������������������������������������������������9
5�7 Demagnetisation �����������������������������������������������������������������������������������������������������������������������������9
5�8 Power Level Selection������������������������������������������������������������������������������������������������������������������ 10
6 Safety Features ����������������������������������������������������������������������������������������������������������������������������� 10
7 Troubleshooting ���������������������������������������������������������������������������������������������������������������������������� 11
8 Spare Parts ������������������������������������������������������������������������������������������������������������������������������������ 11

3
Table of Contents
› Because the IHN080/120 generates a magnetic field,
people wearing a pacemaker must not be within 5m
(16ft) of the IHN080/120 during operation� Electronic
equipment, such as wrist watches, may also be affected�
›Follow the operating instructions at all times�
›Be certain that the voltage supply is correct�
›Electrical arcing may occur when a potential difference
exists between the IHN080/120 and the workpiece� This
is not dangerous to human beings and will not cause
damage to the IHN080/120 or the workpiece� However,
the IHN080/120 must never be used in areas where
there is a risk of explosion�
›Do not expose the heater to high humidity�
›Never operate the IHN080/120 without a yoke in
position�
›Do not modify the IHN080/120�
›Use proper handling equipment when lifting heavy
workpieces�
›Avoid contact with hot workpieces� Wear the supplied
heat-resistant gloves to handle hot workpieces�
Safety Recommendations
1 Introduction
The IHN080/120 induction heater is designed to heat bearings that are mounted with an interference fit onto a shaft� The
heat causes the bearing to expand, which eliminates the need to use force during installation� A 90°C (194°F) temperature
difference between the bearing and shaft is generally sufficient to enable installation� At an ambient temperature of 20°C
(68°F), the bearing must therefore be heated to 110°C (230°F)�
1.1 Intended Use
The IHN080/120 has been designed to heat rolling bearings� However, other metal workpieces that form a closed circuit can
also be heated� Examples of acceptable workpieces include bushings, shrink rings, pulleys, and gears� All bearings that fit
over the inductive coil and between the vertical supports with the top yoke in place can be heated using the IHN080/120�
In addition, smaller bearings can be placed over either of the three standard yokes�

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1.3 Distinguishing Feature
The distinguishing feature of the IHN080/120 induction heater is the location of the workpiece at the same position on the
core as the inductive coil� This design improves efficiency, resulting in less power consumption and faster heating, which
reduces the cost to heat each bearing�
1.2 Principle of Operation
The IHN080/120 generates heat by means of a large electrical
current that is magnetically induced in the workpiece by a
coil within the heater� The high voltage, low current electricity
flowing through the large number of windings in the inductive
coil induces low voltage, high current electricity in the workpiece�
Because the workpiece has the electrical characteristics of a coil
with a single, short-circuited winding, the high current generates
heat within the workpiece� Because the heat is generated within
the workpiece, all of the heater components remain cool�
2 Description
The operation of the heater is controlled by the internal electronics in either of two modes� The operator can either select the
desired temperature of the bearing in TEMP MODE or set the length of time that the bearing will be heated in TIME MODE� The
power level can be adjusted in steps of 20% for slower heating of sensitive workpieces (for example, bearings with C1 or C2
clearance)�
2.1 Components
The IHN080/120 induction heater contains a U-shaped iron core with an inductive coil surrounding one of the vertical sup-
ports� Internal electronics control the operation of the heater� A removable yoke on the top of the vertical supports allows
the workpiece to be placed onto the heater� The top yoke of the IHN120 is mounted on a swivel� To accommodate smaller
workpieces, two smaller yokes are also provided� A temperature probe is included with the heater� Heat-resistant gloves are
also included�

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2.2 Technical Data
IHN080 IHN0120
Voltage (± 9%): 1 ~ 100 – 240 V / 50-60 Hz* 3 ~ 400 – 575 V / 50-60 Hz*
Recommended circuit protection 20 A circuit breaker 20 A circuit breaker
Power consumption (maximum) 3�7 kVA 9�2 kVA
Temperature control 0 – 250 °C (32 – 482 °F)
in steps of 1 °C (2 °F)
0 – 250 °C (32 – 482 °F)
in steps of 1 °C (2 °F)
Probe maximum temperature 250 °C (482 °F) 250 °C (482 °F)
Time mode 0 – 60 minutes in steps of 0�1 minute 0 – 60 minutes in steps of 0�1 minute
Power range 20 – 100% in steps of 20% 20 – 100% in steps of 20%
Demagnetisation, automatic Residual magnetism < 2 A/cm Residual magnetism < 2 A/cm
Overall dimensions 420 x 280 x 345 mm 420 x 280 x 420 mm
Area between supports (wxh) 145 x 205 mm 145 x 205 mm
Coil diameter 115 mm 115 mm
Weight (with yokes) 35 kg 38 kg
Workpiece maximum weight Bearing 80 kg, solid component 40 kg Bearing 120 kg, solid component 60 kg
Maximum heating temperature Approx� 400°C (752°F) Approx� 400 °C (752 °F)
Standard yoke dimensions
55 x 55 x 275 mm (for Ø of 80 mm)
28 x 28 x 275 mm (for Ø of 40 mm)
14 x 14 x 275 mm (for Ø of 20 mm)
55 x 55 x 275 mm (for Ø of 80 mm)
28 x 28 x 275 mm (for Ø of 40 mm)
14 x 14 x 275 mm (for Ø of 20 mm)
3 Installation of Mains Plug
Due to the many types of mains plugs, no mains plug is supplied with the IHN080/120� A qualified electrician must install a
suitable mains plug� The correct supply voltage is shown on the type plate/ underside of the heater�
The wires should be connected as follows:
IHN080
Color of IHN080 Wire Mains Supply Terminal
Yellow/green Protection earth (PE)
Brown Phase 1 (L1)
Blue Neutral (N)
* Each bearing heater family has several voltage options. Please refer to the type plate on the heater body to determine the actual operating voltage.

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Connect the IHN120 to only two of the three phases� Verify that the correct circuit breaker is installed� See section 2�2 for
circuit breaker specifications�
IHN120
Color of IHN120 Wire Mains Supply Terminal
Yellow/green Protection earth (PE)
Brown Phase 1 (L1)
Blue Phase 2 (L2)
4 Preparation for Use
› Place the IHN080/120 in the horizontal position on a stable surface�
›Connect the mains plug to a suitable mains supply�
› For the IHN120 only, follow these steps to install the swivel arm:
›Attach the protection plate (4) to the side post to prevent damage�
›Install the swivel head (1) and the swivel body (2) on the lefthand
side post of the heater�
›Install the large top yoke (55 x 55mm) in the swivel head� Adjust
the swivel body so that there is no visible gap (A) between the
side post and the yoke�
›Tighten the four screws (3) of the swivel body (maximum torque 5Nm)�
›Turn the screw (5) on top of the swivel head to position the top
yoke� The top yoke must contact as much of the upper surface of
the right-hand side post (B) as possible� Noise during
operation could indicate that the top yoke is not positioned properly�
›Special notes for the IHN120:
›The yoke support is required when either of the smaller yokes
(28 x 28mm or 14 x 14mm) is installed� Install the yoke support and
the yoke together in the swivel head� If necessary, rotate the swivel
head to provide better access�
›Heavy workpieces (≥10kg / 22lbs) that must be installed on the top
yoke should be supported until the yoke is in the correct position on
the right-hand side post� The heater may tip over if the workpiece is not supported�
›The swivel body (2) can remain on the heater at all times�
›Turn the screw (5) on top of the swivel head to position the top yoke� The top yoke must contact as much of the upper
surface of the right-hand side post (B) as possible� Noise during operation could indicate that the top yoke is not positioned
properly�

7
B
A
›For workpieces with an internal diameter large enough to fit over the inductive coil, follow these steps:
›Place the workpiece over the inductive coil using appropriate lifting equipment�
›For best performance, adjust the position of the workpiece so that the inductive coil is in the center�
›Remove the protective film from the bright underside of the top yoke before the first use�
›Position the top yoke so that it completely covers the top of both vertical supports�
›If you will use TEMP MODE, plug the temperature probe into the connector on the left side of the heater� Place the magnetic
end of the probe on the inner ring of the bearing or on the innermost surface of the workpiece�
›Use the power switch on the left side to switch on the IHN080/120�
›Observe the self-test of the display and signal tone�
5 Operation
5.1 Function of Displays
A) The main display shows the selected time or temperature for heating:
Display Indication
tTime in minutes
°C Temperature in degrees Celsuis
°F Temperature in degrees Fahrenheit
B) The power display shows the selected power setting:
Display Indication
•20% power
•• 40% power
••• 60% power
•••• 80% power
••••• 100% power

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5.2 Function of Buttons
Button Function
POWER Press to adjust the power in steps of 20%� The selected power is indicated on the power display�
MODE Press to switch between TIME MODE and TEMP MODE�
UP (+) Press to increase the value shown on the main display�
DOWN (-) Press to decrease the value shown on the main display�
START/STOP Press to start or stop the heater� The LED on the START/STOP button is lit when the heater is heating and
flashes during temperature measurement�
5.3 Temp Mode
› If the main display shows “t”, press MODE to select TEMP MODE� The main display shows °C or °F in TEMP MODE�
›The selected temperature is shown on the main display� The default temperature for bearings is 110°C (230°F)� If a different
temperature is desired, press UP or DOWN to adjust the temperature in steps of 1°C (2°F)�
› It may be desirable to heat bearings to temperatures above 110°C (230°F) for increased mounting time� Consult the bearing
specifications to determine the maximum permitted temperature� Always ensure the bearing does not lock due to an
excessive expansion of the inner ring compared to outer ring� See section 5�8�
›All Spherical Roller Bearings (SRBs) are subjected to a special heat treatment� These bearings can be operated at temperatures
as high as 200°C (392°F)� Heating these bearings above 110°C (230°F) will not cause any damage as long as the bearing is
still able to rotate� For other bearings, a temperature of 125°C (257°F) must not be exceeded unless otherwise specified�
› Press POWER to select the power level� Use the guidelines in section 5�8 to determine the correct power setting�
›Make sure the temperature probe is mounted on the bearing inner ring�
›Press START/STOP to start the heater� The main display shows the current temperature of the workpiece�
›When the selected temperature has been reached, the heater demagnetises the workpiece, switches off and generates an
acoustic signal for 10 seconds or until START/STOP is pressed�
›Press START/STOP to stop the heater�
›Remove the workpiece with proper handling equipment�

9
›If the workpiece remains on the heater, the heater will start again when the temperature of the workpiece drops 10°C (18°F)�
Press START/STOP to stop the heater and demagnetise the workpiece�
›The IHN080/120 is now ready to heat another workpiece with the same settings�
5.4 Time Mode
› If the main display shows °C or °F, press MODE to select TIME MODE� The main display shows “t” in TIME MODE�
› Press UP or DOWN to adjust the time in steps of 0�1 minute�
› Press POWER to select the power level� Use the guidelines in section 5�8 to determine the correct power setting�
› Press START/STOP to start the heater� The main display shows the time that remains�
› When the time has elapsed, the heater demagnetises the workpiece, switches off and generates an acoustic signal for 10 seconds�
› Press START/STOP to cancel the acoustic signal and stop the heater�
› Remove the workpiece with proper handling equipment�
› The IHN080/120 is now ready to heat another workpiece with the same settings�
5.5 Temperature Measurement
When the heater is not operating, the temperature of the workpiece can be measured by pressing MODE and START/STOP
at the same time� The LED on the START/STOP button flashes during temperature measurement� Press START/STOP to cancel
temperature measurement�
5.6 Change of Temperature Units
Press MODE and UP at the same time to switch between °C and °F� The temperature unit setting remains the same even after
disconnection from mains power�
5.7 Demagnetisation
The workpiece is automatically demagnetised when heating is complete� Demagnetisation will not occur if the power is
interrupted or the main switch is switched off� To use the IHN080/120 for demagnetisation only, select TIME MODE and set
the time to 0�1 minute (6 seconds)�

10
5.8 Power Level Selection
When heating bearings with an induction heater, most of the heat will be generated in the inner bearing race� The heat
will then be transferred through the bearing� It is therefore important that bearings with small internal clearance or slight
preload are heated slowly� Slow heating ensures that the bearing expands evenly, thereby preventing damage to the bearing�
6 Safety Features
The IHN080/120 is equipped with the following safety features:
›Automatic overheating protection�
›Automatic current control�
›In the TEMP MODE the heater will switch off if the temperature probe does not register a temperature increase of 1°C (2°F)
every 15 seconds� To increase the interval to 30 seconds, press MODE and DOWN at the same time�
›Additionally, the IHN120 is equipped with a main switch with over-current circuit breaker�
The shape, weight, size, and internal clearances all affect the amount of time required to heat a bearing� The large
variety of bearing types prevents the possibility of providing a specific power level setting for each type� Instead, the
following guidelines are provided:
›For sensitive bearings (including bearings with C1 or C2 internal clearance) or bearings with brass cages, do not exceed
20% power when using the small yoke, 40% power when using the medium yoke, or 60% power when using the
large yoke�
›When using the small yoke, never exceed 40% power�
›When using the medium yoke, never exceed 60% power�

11
7 Troubleshooting
Display Fault Action
E01 E General system failure Return heater for repair
E02 E Memory failure Return heater for repair
E03 E Overheated coil Wait until the inductive coil cools
E04 E Not in use
E05 E Temperature increase of less than 1°C (2°F) every
15 seconds (or 1°C (2°F) every 30 seconds)
Check the temperature probe connection� If the connection
is OK, select the 30 second interval as described in section 6
or operate the heater in TIME MODE�
E06 E Temperature probe not connected (or defective) Check the temperature probe
E07 E Failure during current measurement Return heater for repair
E08 E Failure during communication with power printed
circuit board Return heater for repair
E09 E Overheated printed circuit board Wait until the printed circuit board cools�
8 Spare Parts
Description Part Number
Spare temperature probe IHNP2SENSOR
Spare protective gloves IHNGLOVES
Spare set support yoke 55 x 55 x 100 mm for IHN080/120 IHN080/120-YS
Spare yoke 10 x 10 x 275 mm for IHN080/120 IHN080/120-Y1
Spare yoke 14 x 14 x 275 mm for IHN080/120 IHN080/120-Y2
Spare yoke 20 x 20 x 275 mm for IHN080/120 IHN080/120-Y3
Spare yoke 28 x 28 x 275 mm for IHN080/120 IHN080/120-Y4
Spare yoke 40 x 40 x 275 mm for IHN080/120 IHN080/120-Y6
Spare yoke 55 x 55 x 275 mm for IHN080/120 IHN080/120-Y8
Spare swivel arm complete for IHN080/120 IHN080/120-SA
A system fault will be indicated by an acoustic signal and one of the following fault codes on the main display:

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