Perma Star Control Time User manual

perma STAR CONTROL TIMEperma-tec GmbH & Co. KG
The Expert in Lubrication Solutions
Translation of the
Original Operating Instructions
perma
STAR CONTROL TIME

perma-tec GmbH & Co. KG
The Expert in Lubrication Solutions
This operating manual is valid for the lubricator
perma STAR CONTROL TIME in sizes S60, M120 and L250.
© 2006 perma-tec GmbH & Co. KG
Without the specic approval of perma-tec GmbH & Co. KG no part of this documentation can
be copied or made available to third parties.
We have taken great care when compiling all the details contained in this documentation.
However we cannot rule out discrepancies and we reserve the right to make technical
changes to the product without giving advance notice.
We do not assume any judicial responsibility or liability for damages which may ensue as a
result.
We will include any necessary changes in the next edition.
Compiled and printed: 08 / 01 / 2013

perma STAR CONTROL TIME
Table of Contents
1 VARIOUS 1
1.1 About this operating manual 1
1.1.1 Terms used 1
1.1.2 Usage of safety instructions 1
1.1.3 Danger signs 1
1.1.4 Tips 1
1.2 Delivery 2
1.3 Lubricator perma STAR CONTROL TIME 2
1.3.1 Markings 2
1.3.2 Intended usage 2
1.4 Legal requirements 3
1.4.1 Liability 3
1.4.2 Warranty 3
2 SAFETY INSTRUCTION 4
2.1 Persons responsible for safety 4
2.2 General safety informations 4
2.3 Safety information for perma STAR CONTROL TIME 5
2.3.1 Safety during installation and maintenance 5
2.3.2 Safety when handling LC units 5
3 TECHNICAL DATA 6
3.1 Data sheet: power supply 6
3.1.1 Cable construction 6
3.1.2 Values 6
3.2 Product specications 6
3.2.1 Pin assignment 6
3.2.2 Components 7
3.2.3 Airborne noise emission 7
3.2.4 Function 8
3.2.5 Reference table for discharge amount per discharge cycle 8
3.3 Weights and measurements 8
3.4 Operating conditions 9
3.4.1 Temperatures 9
3.4.2 Ambient conditions 9
4 STORAGE 9
4.1 General storage information 9
4.1.1 Storage conditions 9
4.1.2 Storage periods 9

perma-tec GmbH & Co. KG
The Expert in Lubrication Solutions
5 STARTING AND OPERATING 10
5.1 Preparation 10
5.2 Before operation 10
5.3 Initial operation 10
5.4 During operation 11
6 CHANGING THE LC UNIT 12
6.1 General note 12
6.2 How to change the LC unit 12
7 DRIVE UNIT SETTINGS 13
7.1 Function display 13
7.2 Circuit board settings 13
7.2.1 Setting discharge amount 14
7.2.2 Setting volume of LC unit 14
7.3 Table of discharge 14
7.3.1 Examples for determining proper dip switch settings to achieve
optimal lubrication 15
7.3.2 Changing the discharge volume after the perma STAR CONTROL TIME
has been in operation/reset function 17
8 TROUBLE SHOOTING 18
9 DISPOSAL 19
10 ACCESSORIES FOR perma STAR CONTROL IMPULSE 19
10.1 Accessories 19
10.2 Replacement parts 19
11 SERVICE 19
12 SUGGESTION FOR PLC CONNECTION 20
12.1 Suggestion for PLC connection with one output signal 20
12.2 Suggestion for PLC connection with two output signals 21
12.3 Suggestion for PLC connection with three output signals 22
EC Declaration of Conformity

perma STAR CONTROL TIME
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1 VARIOUS
1.1 About this operating manual
♦ This operating manual is intended for the safe operation of the perma STAR
CONTROL TIME automatic lubricator. It contains safety instructions which must
be adhered to.
♦ Everyone who works on or with the lubricator must have access to this operating
manual during their shift. They must also pay attention to all relevant instructions
and notices.
♦ The operating manual must be kept in a complete and easy to read condition.
1.1.1 Terms used
♦ Lubricator
In the following text, the “lubricator” will either be called “lubricator” or by its name
“perma STAR CONTROL TIME”.
♦ Lubrication Canister
In the following text, the “Lubrication Canister” will be called LC unit.
The user can order the LC unit lled with different oils and greases and in sizes
S60, M120 and L250.
1.1.2 Usage of safety instructions
All safety instructions in this operating manual are standardized.
1.1.3 Danger signs
Attention Danger!
This sign warns you of any danger to people’s health, life-threatening injuries
and death.
1.1.4 Tips
This sign alerts you to application tips which will help you in doing certain things
quicker and safer.

perma-tec GmbH & Co. KG
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The Expert in Lubrication Solutions
1.2 Delivery
♦ perma STAR CONTROL TIME can be ordered and delivered according to custo-
mer specications in regards to type of grease and oil, size / content of LC unit.
♦ Upon delivery, make sure to check if the delivered goods correspond to your
order. perma-tec GmbH & Co. KG will not accept liability for subsequent claims
of any shortcomings.
♦ Please immediately forward any claim
▪ of noticeable transport damage: directly to the forwarder
▪ of noticeable faults, shortcomings or defects: directly to your perma distributor.
1.3 Lubricator perma STAR CONTROL TIME
1.3.1 Markings
♦ The lubricator perma STAR CONTROL TIME is clearly marked with a label on
the drive system and a label on the LC unit.
♦ CE Mark on the drive unit
♦ Manufacturer:
perma-tec GmbH & Co. KG
Hammelburger Straße 21
97717 Euerdorf, Germany
Tel: [phone] E-mail: [email protected]
Fax: [phone] Homepage: www.perma-tec.com
1.3.2 Intended Usage
♦ The lubricator perma STAR CONTROL TIME
▪ supplies all lubrication points with oil and grease to a large extent continu-
ously, precisely and temperature independent up to a pressure build-up of
max 5 bar / 75 psi; can be turned off and on via the machine (machine
controlled).
▪ can be used for all lubrication points of sliding- and roller bearings, drive-
and transport chains, sliding guideways, open gears and seals.
▪ is intended for use on machinery and equipment where lubrication is only
to take place when the machine is running, and where a status report to the
machine is desired.
▪ is only to be used for the ordered purpose and purposes conrmed by
perma-tec.

perma STAR CONTROL TIME
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▪ is only to be used for operating conditions recommended in this operating
manual.
▪ is only to be used with settings and variations recommended by this
operating manual.
Any other usage, setting and variation is considered to be inappropriate.
1.4 Legal requirements
1.4.1 Liability
♦ The information, data and tips stated in this operating manual were up-to-date as
of the printing date.
No claims for already delivered lubricators can be made based on the
information, pictures and descriptions.
♦ perma-tec GmbH & Co. KG can not be held liable for damages and malfunctions
caused by:
▪ inappropriate usage;
▪ unauthorized alterations to the drive system or the LC unit;
inappropriate operations on or with the lubricator;
▪ incorrect operation and settings of the lubricator;
▪ incorrect settings of time and size of the lubricator;
▪ ignoring the operating manual.
1.4.2 Warranty
 ♦ Warranty terms and conditions: see terms and conditions of sale and delivery
appertaining to perma-tec GmbH & Co. KG.
♦ Lodge any warranty claims with perma-tec immediately after the defect or error
has been identied.
♦ The warranty expires in all instances where no liability claims can be enforced.

perma-tec GmbH & Co. KG
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2 SAFETY INSTRUCTION
2.1 Persons responsible for safety
 ♦ Operator
  ▪ The operator is any individual or legal entity who or which uses the
lubricator or on whose authority the lubricator is used.
▪ The operator or his safety ofcer must warrant,
- that all the relevant regulations, instructions and laws are adhered to;
- that only qualied personnel will work with and on the lubricator;
- that the operating manual is made available to the personnel
for all work done with and on the lubricator, and that the personnel
adhere to it;
- that unauthorized personnel are not allowed to work with and on the
lubricator;
- and that the safety regulations are adhered to when mounting the
lubricator or during maintenance.
 ♦ Qualiedpersonnel
Qualied personnel are persons who, by virtue of their training, experience,
instruction and information concerning the relevant standards and provisions,
accident prevention regulations and plant and operating conditions, as received
from the person responsible for the safety of the plant, are entitled to carry out
the activities required at any time so that any possible dangers or hazards can
be identied and avoided.
2.2 General safety instructions
♦ We are not laying claim to completeness as regards these safety instructions.
Please contact your local supplier if you have any queries or problems.
♦ At the time of delivery the lubricator is in line with state-of-the-art technology and
in principle is considered to be safe to operate.
♦ Dangers emanate from the lubricator for persons, the lubricator itself and
for other material assets of the operator if:
▪ unqualied personnel operates the lubricator;
▪the lubricator is used inappropriately and for operations that it was not
intended to be used for;
▪the lubricator setting / variation is incorrect.

perma STAR CONTROL TIME
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♦ The lubricators must be lled with the correct oil or grease and must be set to
operate correctly without causing any hazards to people when set, installed, and
used for its intended purpose. This also pertains to their operation together with
the complete machine and its lubrication points.
♦ Make sure to prevent material damage by putting certain measures in place in
the case that the lubricator malfunctions.
♦ Operate the lubricator only when it is in perfect condition.
♦ Retrotting, changing or reconstructing the lubricator is not allowed. perma-tec
must be consulted rst.
♦ The LC unit should not be forced open.
2.3 Safety information for perma STAR CONTROL TIME
2.3.1 Safety during installation and maintenance
♦ Ensure that all workstations and trafc routes are clean and safe!
♦ Ensure that the relevant regulations and guidelines are adhered to when the
installation or maintenance work is carried out in places where danger of falling
exists.
♦ Ensure that the relevant safety and operating instructions are observed when the
lubricators are installed on machines or in factories (i.e. to stop the machine).
2.3.2 Safety when handling the LC unit
♦ Avoid contact of oil and grease with eyes, skin, and clothing!
♦ Avoid swallowing of oil and grease!
♦ Prevent oil and grease from getting into soil or sewer system!
♦ Observe safety data sheets of oils and greases! You may also download data
sheets of lubricants supplied by perma-tec from perma-tec’s web page
(www.perma-tec.com) or ask your local supplier.
♦ Oil and grease on trafc ways will increase the danger of slipping! Therefore,
immediately clean oil and grease from oors!
♦ Only use original LC units from perma-tec!

perma-tec GmbH & Co. KG
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The Expert in Lubrication Solutions
3 TECHNICAL DATA
3.1 Data sheet: power supply
3.1.1 Cable construction:
Conductor cross-sectional dimensions: 4 x 0.25 mm2
Flexible cord construction: Cu ex 32 x Ø 0.1 mm blk
Insulation: PVC Ø 1.3 + 0.05
wall thickness abt. 0.32 mm
Cable covering: PUR / black
3.1.2 Values
Line resistance: 79.9 Ω/km at 20 °C (68 °F)
Safe temperature: static condition: -25 to +70 °C (-13 to 158 °F)
dynamic condition: -5 to +70 °C (23 to 158 °F)
Output load each max. 400 mA, short-circuit proof
 Cableisdragchainqualied,approvedforthesmallestbendingradius60mm.
Power supply 15 to 25 V DC (max. 30 V DC, 5 % residual ripple) must be ap-
plied for at least 2 minutes in order to achieve the correct discharge period!
Typical current consumption 0.2 A (current at make can be up to 1.2 A).
Max. output load (Pin 2 + 4) cannot exceed 400 mA each.
3.2 Productspecications
3.2.1 Pin assignment
Pin assignment cable colour signal
1 brown current +
2 white LED green digital
3 blue current -
4 black LED red digital
Pin assignment of the connector
on the lubricator
2
1
4
3

perma STAR CONTROL TIME
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3.2.2 Components
♦ Lubricators are delivered as requested by the customer in regards to size,
and oil or grease lling. They consist of (see Picture 1):
a) Plug
b) LC unit (Lubrication Canister), available with the requested lubricant and in
three different sizes (thread size R1/4).
LCunitcannotberelled!
c) Drive unit, consisting of a gear motor and circuit board for control of the lubrica-
tor. Every drive has an individual, consecutive series number (this number must
be provided for all inquiries about the system).
Drive unit can be re-used.
d) LED function display
e) Cover (re-usable)
f) Cable with plug (re-usable)
a b c d e f
Pict. 1
3.2.3 Airborne noise emission
Emission sound pressure level of the lubrication system: < 70 dB(A)
(Measuring point: distance 1 m / height 1.6 m)

perma-tec GmbH & Co. KG
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The Expert in Lubrication Solutions
3.2.4 Function
Whenever external power is applied, the lubricator discharges a set amount of lubri-
cant in pre-determined intervals.
In the LC unit, a motor driven spindle pushes the lubricant out of the LC unit. The
piston will move and, depending on the counter pressure, will build up pressure in
the LC unit of up to 5 bar (75 psi). The automatic pressure shut off will turn the
system OFF after several attempts when the pressure exceeds 5 bar.
With dip switch 3 and 4 of the 4-way code switch on the circuit board (marked “VOL”)
you can set the size of the LC unit. With dip switch 1 and 2 (marked “TIME”) you can
set the discharge amount for every 100 operating hours.
perma STAR CONTROL TIME divides the set discharge amount (= size of the LC
unit) into several small discharge cycles within the discharge period (please see the
following chart listing discharge amount per discharge cycle. Please also refer to
chapt. 7.3).
3.2.5 Reference table for discharge amount per discharge cycle
Type Volume
[cm3]Diameter D [mm] Total lenght L [mm] Weight empty [kg] Weightlled with SF01
[kg]
S60 60 71 142 0.344 ≈ 0.400
M120 120 71 165 0.358 ≈ 0.470
L250 250 71 215 0.399 ≈ 0.632
R 1/4
L
DDrive LC unit
3.3 Weights and measurements
Discharge
period Pause time Discharge amount per discharge cycle
S60 M120 L250
[Months) [h:min] [cm3] [cm3] [cm3]
1 1:30
0.13 0.26 0.53
3 4:37
6 9:17
12 18:36

perma STAR CONTROL TIME
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3.4 Operating conditions
3.4.1 Temperatures
♦ Temperature range: -10 °C to +50 °C (+14 °F to +122 °F)
♦ Within this temperature range, a regular discharge and a max. output pressure
up to 5 bar (75 psi) is guaranteed.
♦ For temperatures higher than +50 °C (+122 °F) and lower than -10 °C (+14 °F),
the correct function can no longer be guaranteed.
3.3.2 Ambient conditions
♦ The lubricators are protected against dust and water jets when the individual
parts are assembled correctly.
♦ Ambient media, especially chemically aggressive substances, may affect sealing
rings and plastic materials.
4 STORAGE
4.1 General storage information
When the lubricators are not immediately installed, you must ensure appropriate
storage conditions in dry, dust free, sunlight-protected rooms indoors.
4.1.1 Storage conditions
♦ Dry
♦ Dust free
♦ Temperature +20 °C ± 5 °C (+68 °F ± 9 °F)
4.1.2 Storage periods
♦ Up to one year
▪ LC unit: refer to lling date i. e. 03/06 = June 2003
♦ Up to two years
▪ Drive unit
▪ Drive unit cover
▪ Cable and plug

perma-tec GmbH & Co. KG
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The Expert in Lubrication Solutions
5 STARTING AND OPERATING
5.1 Preparation
Before installing the lubricator, the lubrication points and any extensions must be
adequately pre-lubricated with the same lubricant which is contained in the perma
STAR CONTROL TIME.
For this purpose, perma-tec offers a 400 g lubricant cartridge for grease guns
(see chapter 10.1).
♦ Please use a STAR support ange G1/4o x G1/4i (brass/plastic) from perma-tec
for the installation of perma STAR CONTROL TIME.
♦ For horizontal mounting positions we recommend the clip (plastic) to hold the
lubricator in place.
The perma STAR installation instructions provide support for mounting of the lubrica-
tors and can be downloaded from our homepage.
5.2 Before operation
♦ Completely check the lubricator for visible damages!
♦ Check if the LC unit is lled with the requested grease or oil!
♦ Do “VOL” switches 3+4 of the four-way code switch in the drive unit match the
correct size of the LC unit (see chapter 7.3)?
♦ Do “TIME” switches 1+2 of the four-way code switch in the drive unit match the
desired discharge period (see chapter 7.3)?
♦ Oil-lled LC units: Check if an oil retaining valve is attached.
♦ Were all components properly assembled and screwed together hand-tight?
♦ Ensure that the cable is plugged into the perma STAR CONTROL TIME.
5.3 Initial operation
♦ perma STAR CONTROL TIME is delivered with a pre-set discharge period of
6 months and LC unit M120 (standard setting).
♦ On request, we can pre-set the discharge amount or discharge mode according
to your requirements.
Regardless of which option you choose, the operator must check the setting
again and carry out any desired changes before starting the lubricator
(see chapter 7)!

perma STAR CONTROL TIME
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♦ Pre-lubricate the lubrication point with the same lubricant that is contained in the
perma STAR CONTROL TIME (see chapter 5.1).
♦ Check if the thread of the LC unit corresponds to the thread of the screw
point (R1/4).
♦ In the switch cabinet, connect the cable according to the PLC-wiring diagram for
the status display. The connection may only be carried out by qualied experts
and must be carried out according to local standards (i. e. IEC, VDE etc.).
NOTE: Incorrect connection of the perma STAR CONTROL TIME could
destroy the electronics.
♦ Unscrew and remove the cover of the drive unit. Set the dip switches 1-4
(“TIME” and “VOL”) of the 4-way code switch according to your calculations
(see chapter 7.3). Place cover back on drive unit and remove the plug from the
LC unit. Screw perma STAR CONTROL TIME onto the lubrication point
(handtight). Never screw in the lubricator a second time as this would impair the
self-sealing of the thread. Plug the cable into the connection on perma STAR
CONTROL TIME.
♦ Seal threads of all connecting parts with a suitable, standard sealant. Ensure that
oil lled lubricators are mounted (max. ± 45°) vertically (outlet pointing down).
NOTE: After a reset, perma STAR CONTROL TIME will start with the
corresponding pause time.
5.4 During operation
♦ Carry out regular performance checks during operation.
Check for possible leakages and the status of the lubricator!
♦ Regularly monitor the ll-level of the transparent LC unit!
♦ In case of malfunctions during operation, please check the trouble shooting chart
in chapter 8. If the malfunction cannot be corrected, please contact your perma
distributor.
Please make sure to refer to point 7.3.2 if the settings must be changed after the
perma STAR CONTROL TIME was already put into operation.

perma-tec GmbH & Co. KG
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The Expert in Lubrication Solutions
6 CHANGING THE LC UNIT
6.1 General note
When the red and the green LED light up at the same time, the LC unit is empty and
should be replaced.
During the LC unit exchange, it is possible to choose a different size and a different
discharge period by resetting the dip switches of the 4-way code switch on the circuit
board.
Since the drive unit and the circuit board must always be protected from moisture,
the exchange must be carried out in a dry place!
6.2 How to change the LC unit
a) Unplug the cable from the perma STAR CONTROL TIME.
b) Completely screw off and remove the lubricator from the lubrication point.
c) Unscrew the cover from the drive unit.
d) Remove the drive unit from the LC unit.
e) Dip switches of the 4-way code switch should be changed in cases where a
different size LC unit was used, or if a different discharge period is desired (see
chapter 7.3.2).
f) Place drive unit on top of new LC unit until the teeth of both units are locked.
g) Screw the cover of the drive unit onto the LC unit hand-tight.
h) Remove plug from the LC unit.
i) Screw the lubricator into the lubrication point hand-tight, but DO NOT screw it in
a second time.
j) For oil lled lubricators, make sure that the lubricator is installed (max. ± 45°)
vertically (outlet pointing down).
k) Plug cable back into the perma STAR CONTROL TIME.
l) After a reset/exchange of LC unit, perma STAR CONTROL TIME will start with
the corresponding pause time.
Please note that the warranty will expire if above instructions are not followed.

perma STAR CONTROL TIME
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7 DRIVE UNIT SETTINGS
7.1 Function display
The LEDs (Light Emitting Diodes) are on the circuit board and are visible through the
transparent cover (see picture 2, chapter 7.2).
The perma STAR CONTROL TIME has a red and green LED. The following signals
about operating conditions/malfunctions are displayed by the LED for the user:
7.2 Circuit board settings
The 4-way code switch is located on the circuit board.
Dip switches 1+2 marked “TIME” are used to set the dicharge amount, dip switches
3+4 marked “VOL” are used to set the LC unit size.
You may set/change the switches with the help of a small screw driver or with your
ngers.
LED Signal Meaning
green steady System functions OK
red steady for less than 30 seconds with
motor run STAR CONTROL TIME is discharging
red steady signal for more
than 30 seconds Malfunction/Error
green and red steady signal LC unit empty, please change
Picture 2
LED red
LED green
Four-way
code switch
Four-way code switch
with switches 1-4
Plug connection
Circuit board

{ {
TIME VOL
Vol.Time 34
1 2

perma-tec GmbH & Co. KG
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The Expert in Lubrication Solutions
7.2.1 Setting the discharge amount
The lubricant amount per impulse must be set with dip switches 1+2 “TIME” of the
4-way code switch located on the circuit board of the drive unit.
If the position of code switches 1+2 “TIME” of the 4-way code switch does not
correspond to the desired discharge amount (see chapter 7.3), it will lead to wrong
signals and to over- or under-lubrication (see chapter 8).
7.2.2 Setting volume of LC units
The LC unit size must be set with dip switches 3+4 “VOL” of the 4-way code switch
located on the circuit board of the drive unit.
If the position of code switches 3+4 “VOL” of the 4-way code switch does not
correspond to the actual size of the LC unit, it will lead to an incorrect signalling of
ll level (see chapter 8).
7.3 Table of discharge
Amount of discharge in cm3(1 cm3 ≈ 0.9 g Lubricant)
per 100 operating hours
Dip switches 1+2
“TIME” of the
4-way code switch
Code
switch
LC unit S60 M120 L250
Dip switches 3+4
“VOL” of the 4-way
code switch
Discharge period
8.33 16.67 34.72 ≙1 Month
at continuous
operation
2.78 5.56 11.57 ≙3 Months
at continuous
operation
1.39 2.78 5.79 ≙6 Months
at continuous
operation
0.69 1.39 2.89 ≙12 Months
at continuous
operation
Time
1 2
Time
1 2
Time
1 2
Time
1 2
Vol.
3 4 Vol. 3 4 Vol. 3 4

perma STAR CONTROL TIME
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7.3.1 Examples for determining proper dip switch settings to achieve optimal
lubrication
In the “normal mode” (per 100 operating hours)
Example 1:
A roller bearing is to be provided with 14 cm3of lubricant every 500 hours of
operation: 14 cm3÷ 500 h = 0.028 cm3per h = 2.8 cm3per 100 h
The discharge table in chapt. 7.3 on page 14 shows that 3 different settings are
possible for each LC unit size
Variation I:
2.78 cm3/100 h for a 60 cm3LC unit (S60)
Variation II:
2.78 cm3/100 h for a 120 cm3LC unit (M120)
Variation III:
2.89 cm3/100 h for a 250 cm3 LC unit (L250)
At this point, you can calculate the total discharge life of the LC unit (and the ex
change date). Proceed as following:
The roller bearing to be lubricated is installed in a machine which runs 5 days per
week 8 hours per working day.
To Variation I: 60 cm3LC unit (S60)
2.78 cm3/100 h = 0.0278 cm3/h
60 cm3: 0.0278 cm3/h = 2158.3 h
2158.3 h : 40 h/week = 54 weeks
The lubricant is sufcent for more than 1 year, not including additional operational
breaks or any other machine standstills.
Vol.Time 34
1 2
Vol.Time 34
1 2
Vol.Time 34
1 2

perma-tec GmbH & Co. KG
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The Expert in Lubrication Solutions
To Variation II: 120 cm3LC unit (M120)
2.78 cm3/100 h = 0.0278 cm3/h
120 cm3: 0.0278 cm3/h = 4316.5 h
4316.5 h : 40 h/week = 108 weeks
The lubricant is sufcient for more than 2 years, not including additional operational
breaks or any other machine standstills.
To Variation III: 250 cm3LC unit (L250)
2.89 cm3/100 h = 0.0289 cm3/h
250 cm3: 0.0289 cm3/h = 8650.5 h
8650.5 h : 40 h/week = 216 weeks
The lubricant is sufcient for more than 4 years.
Due to the stability of each individual lubricant we recommend variation I with
a 60 cm3LC unit.
Example 2:
Given the same machine as in example 1, but with different and irregular running
times e.g. 4 hours on day one, 1.5 hours on day two, not running on days three and
four, and 3 hours on day ve.
You can determine the dip switch setting as in example number 1, but the total
discharge life of the LC unit and exchange date cannot be determined.
It is possible to calculate discharge periods of several years. Particular attention
should be paid to these lubrication points. Monitoring is possible with PLC
connection via the output signal “End of discharge”. Please pay special attention to
the shelf life of the grease when you choose long lubrication periods.