SKF LMC 301 Series User manual

EN
for controlling three pumps, each with one- to three -
line SKF Single Line centralized lubrication systems
Lubrication Monitor Controller
of series LMC 301
Version 03
Operating instructions
acc. to EMC, LVD Directives and UL Standard

2
EU Declaration of Conformity in accordance with Directive 2014/30/EU on the electromagnetic compatibility
of devices and Directive 2014/35/EU on the use of electrical equipment within certain voltage limits
The manufacturer, SKF Lubrication Systems Germany GmbH , Walldorf Plant, Heinrich-Hertz-Str. 2-8, DE - 69190 Walldorf, hereby declares
conformity of the device / the electrical equipment
Designation: Lubrication Monitor Controller
Type: LMC 301
Item number: 086500 / 086501 / 086502 / 086503
Year of manufacture: See rating plate
with all relevant provisions of the following Directives at the time of placing on the market. Furthermore, the following Directives and (harmonized) standards
were applied in the applicable areas:
2011/65/EU RoHS II Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment
2014/30/EU EMC Electromagnetic Compatibility
2014/35/EU LVD Use of electrical equipment within certain voltage limits
UL 61010-1 UL (Underwriters Laboratories) Safety Requirements for Electrical Equipment for Measurement, Control,
and Laboratory Use - Part 1: General Requirements
Standard Edition
DIN EN 61000-6-2 2006
DIN EN 61000-6-3 2011
UL 61010-1 2012
DIN EN 61010-1 2011
DIN EN 50581 2013
Walldorf, 2018, March
EN Information concerning EU Declaration of Conformity
Stefan Schürmann
Manager R&D Hockenheim/Walldorf
SKF Lubrication Business Unit
Jürgen Kreutzkämper
Manager R&D Germany
SKF Lubrication Business Unit

3
Masthead
Manufacturer and service address
If you have questions, please contact:
SKF Lubrication Germany GmbH
Hockenheim Plant
2. Industriestraße 4
68766 Hockenheim
Germany
Tel. [phone]
Fax [phone]
www.skf.com/lubrication
EN
Masthead
These operating instructions pursuant to
the EMC and LVD Directives are an integral
part of the product described here and must
be kept for future use.
Other language versions
Versions of these instructions in other
languages can be found at: www.skf.com/
lubrication
Warranty
The instructions do not contain any infor-
mation on the warranty. This can be found
in the General Conditions of Sales, which
are available at:
www.skf.com/lubrication.
Copyright / Integration of instructions
© SKF Lubrication Systems Germany GmbH
All rights reserved.
These instructions are protected by copy-
right.
The use of the contents is permitted for the
purpose of preparing training materials for
internal, non-commercial purposes. Any
other usage of the contents without written
permission of the rights holder is prohibited
and constitutes a violation of copyright.
SKF Lubrication Systems Germany GmbH
Walldorf Plant
Heinrich-Hertz-Str. 2-8
DE - 69190 Walldorf
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
www.skf.com/lubrication
Sales and Service Regions
Europe / Africa / Middle East / India
SKF Lubrication Systems Germany GmbH
Amerika / Asien / Pazifik
SKF Lubrication Business Unit
5148 N. Hanley Rd.,
St. Louis, MO 63134 USA
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
www.lincolnindustrial.com
www.skf.com/lubrication
E-mail: Lubrication-german[email protected]om
www.skf.com/lubrication

4
EN
Table of contents
Table of contents
Operating instructions 1
EC Declaration of Conformity in accordance 2
Explanation of symbols and signs 6
1. Safety instructions 8
1.1 General safety instructions 8
1.2 General behavior when handling the
product 8
1.3 Qualified technical personnel 9
1.4 Electric shock hazard 10
1.5 Operation 10
1.6 Assembly/maintenance/malfunction
/decommissioning/disposal 10
1.7 Intended use 11
1.8 Foreseeable misuse 11
1.9 Disclaimer of liability 12
1.10 Referenced documents 12
1.11 Warning labels on the product 12
1.12 Residual risks 13
2. Overview/System description 14
2.1 LMC 301 controller unit 17
2.2 General design of a Single Line
centralized lubrication system 18
2.2.1 System design 19
3. Technical data 21
3.1 General technical data 21
4. Delivery, returns, and storage 23
4.1 Checking the delivery 23
4.2 Returns 23
4.3 Storage 23
4.3.1 Electronic and electrical devices 23
4.3.2 General notes 23
5. Assembly 24
5.1 General information 24
5.2 Setup and attachment 24
5.2.1 Port dimensions, assembly holes,
and minimum mounting dimensions 25
5.2.2 Opening the controller unit 26
5.2.3 Minimum mounting dimensions 26
5.2.4 Assembly of the controller unit 26
5.3 Electrical connection
5.3.1 General 27
5.3.2 Terminal board 100 to 240VAC 29
5.3.3 Terminal board 24 VDC 30
5.3.4 Line routing 31
5.3.5 Connecting wires 31
5.3.6 Power supply 100 to 240 V AC
and 24 V DC 32
5.3.7 Load switching relay 32
5.3.8 Terminal strip for relay outgoing
terminal 33
5.3.9 Terminal strip for digital inputs 34
5.3.10 Terminal strip for analog inputs 34
5.3.11 Adding an additional IO connection
to RS485 daisy chain 35
5.4 Note on the rating plate 36
5.5 Information on CE marking 36
6. Configuration by operator/local admin 38
6.1 Configuration of the controller
unit with PC software 38
6.2 Configuration of the controller unit
via the display on the controller unit 39
6.2.3 Display and control elements of
the control screen 40
6.2.4 Menu navigation for operators
without password access 44
6.2.5 Menu navigation for local admins
with password access 46
6.2.7 General setting options without
(with) password access 49
6.2.8 Setting options for local admins
(setters) with password access 51

5
EN
Table of contents
6.2.8.1 Changing the password 52
6.3 Single Line-Control system examples 59
6.3.1 2-zone Single Line centralized
lubrication system with
2/2 directional solenoid valves
and 1 pressure switch 60
6.3.2 2-zone Single Line centralized
lubrication system with
3/2 directional solenoid valves
and 2 pressure switches 66
7. Operation/decommissioning and disposal 72
7.1 User-configurable setting options 72
7.2 Temporary shutdown 73
7.3 Recommissioning 73
7.4 Decommissioning and disposal 73
8. Maintenance 74
8.1 General information 74
8.2 Maintenance schedule 75
8.3 Battery replacement 76
8.4 Software update 76
9. Malfunctions, causes, and remedies 77
9.1 Fuse replacement 77
9.2 Display of error messages via
fault LED 78
9.3 Display of error messages on
the screen 78
9.4 Flex-Control unit -Commissioning
malfunctions 82
9.5 System malfunctions 83
9.6 Measures in response to malfunctions 86
10. Spare parts/accessories 87
11. System configuration 88
11.1 Menu navigation for System
configuration - Pump settings 88
11.1.1 Menu navigation for system
configuration - zone settings 90
11.2 Menu structure for system
configuration 92
11.3 Amount of pumps 93
11.4 Setting the pump 94
11.5 Zone 1 Settings (main line settings) 110
11.5.1 Zone 2 Settings (main lines) 117
11.6 Setting parameters to default 118
11.7 Reset to factory settings 118

6
EN
Possible symbols
Meaning
Note
Electric shock hazard
Slipping hazard
Hazard from hot surfaces
Risk of being drawn into machinery
Crushing hazard
Danger from suspended load
Pressure injection hazard
Explosion-proof component
Electrostatic sensitive components
Wear personal safety equipment
(goggles)
Secure (lock) the machine against
accidental starting
Environmentally sound disposal
Explanation of symbols and signs
Explanation of symbols and signs
Activities that present specific hazards to
persons or material assets are indicated
with warnings.
Read the instructions completely and follow
all operating instructions and the warning
and safety instructions.
Warning level Consequence Probability
DANGER Death / serious injury Immediate
WARNING Serious injury Possible
CAUTION Minor injury Possible
NOTE Property damage Possible
Symbol
Information symbols within the text
Symbol Meaning
Prompts an action
Used for itemizing
Refers to other facts, causes, or consequences
Provides additional information within procedures

7
EN
Explanation of symbols and signs
Abbreviations and conversion factors
Abbreviations
re regarding oz. ounce
approx. approximately psi pounds per square inch
°C degrees Celsius hp horsepower
s seconds lb. pound
dB (A) sound pressure level sq.in. square inch
i.e. that is kp kilopond
etc. et cetera cu.in. cubic inch
poss. possibly mph miles per hour
< less than fpsec feet per second
± plus or minus °F degrees Fahrenheit
> greater than fl.oz. fluid ounce
e.g. for example in. inch
if
necessary
if necessary gal. gallon
etc. et cetera
usually usually
Ø diameter Conversion factors
incl. including Length 1 mm = 0.03937 in.
K Kelvin Area 1 cm² = 0.155 sq.in.
kg kilogram Volume 1 ml = 0.0352 fl.oz.
RH relative humidity 1 l = 2.11416 pints (US)
kW kilowatt Mass 1 kg = 2.205 lbs
l liter 1 g = 0.03527 oz.
min. minute Density 1 kg/cm³ = 8.3454 lb./gal.
(US)
max. maximum 1 kg/cm³ = 0.03613 lb./cu.in.
min. minimum Force 1 N = 0.10197 kp
mm millimeter Speed 1 m/s = 3.28084 fpsec
ml milliliter 1 m/s = 2.23694 mph
N Newton Acceleration 1 m/s² = 3.28084 ft./s²
Nm Newton meter Pressure 1 bar = 14.5 psi
Temperature °C = (°F-32) x 5/9
Power 1 kW = 1.34109 hp
Instructions placed on a unit, machine, or
equipment, such as:
o Rotation arrow
o Fluid connection labels must be followed
and kept in fully legible condition.
o Warnings

1. Safety instructions
8
ENEN
1. Safety instructions
1.1 General safety instructions
o The operator must ensure that the in-
structions are read and fully understood
by all persons tasked with working on the
product or who supervise or instruct such
persons.
o The operator must also ensure that the
staff fully understands the content of the
instructions.
o The instructions must be kept readily
available together with the product.
o The manual forms part of the product
and must accompany the product if sold
to a new owner.
o The product described here was manu-
factured according to the state of the art.
o Risks may, however, arise from its usage
and may result in personal injury or dam-
age to property.
o Any malfunctions affecting safety must be
remedied immediately.
In addition to the assembly instructions/op-
erating instructions, all statutory regulations
and other regulations for accident prevention
and environmental protection must be
observed.
1.2 General behavior when handling the
product
o The product may only be used in aware-
ness of the potential dangers, in proper
technical condition, and according to the
information in this manual.
o Personnel must familiarize themselves
with the functions and operation of the
product. The specified assembly and op-
erating steps and their sequences must
be observed.
o Any unclear points regarding proper con-
dition or correct assembly/operation must
be clarified.
Operation is prohibited until issues have
been clarified.
o Unauthorized persons must be kept away.
o All safety instructions and in-house in-
structions relevant to the particular activity
must be observed.
o Responsibilities for different activities
must be clearly defined and observed.
Uncertainty seriously endangers safety.
o Protective and safety mechanisms can-
not be removed, modified, nor disabled
during operation and must be checked
for proper function and completeness at
regular intervals.
If protective and safety mechanisms must
be removed, they must be installed im-
mediately following conclusion of work
and checked for proper function.
o Any malfunctions that occur must be
resolved according to responsibility. The
supervisor must be notified immediately
in case of malfunctions outside one's indi-
vidual scope of responsibility.

1. Safety instructions
9
1
ENEN
1.3 Qualified technical personnel
Only qualified technical personnel may in-
stall, operate, maintain, and repair the prod-
ucts described here.
Such persons are familiar with the relevant
standards, rules, accident prevention regu-
lations, and assembly conditions as a result
of their training, experience, and instruction.
They are qualified to carry out the required
activities and in doing so recognize and
avoid any potential hazards. The definition
of qualified personnel and the prohibition
against employing non-qualified person-
nel are laid down in DIN VDE 0105 and IEC
364. Relevant country-specific definitions of
qualified technical personnel apply for coun-
tries outside the scope of DIN VDE 0105 or
IEC 364.
The operator is responsible for assigning
tasks and the area of responsibility.
The personnel must be trained and in-
structed prior to beginning work if they do
not possess the requisite knowledge.
Product training can also be performed by
SKF in exchange for costs incurred.
o Wear personal protective equipment.
o Observe the relevant safety data sheets
when handling lubricants/equipment.

1. Safety instructions
10
ENEN
1.4 Electric shock hazard 1.5 Operation
The following must be observed while work-
ing on the product.
o All information within this manual and
the information within the referenced
documents
o All laws and regulations that the operator
must observe.
All relevant persons (operating personnel,
supervisors) must be informed of the activ-
ity prior to beginning work.
Precautionary operational measures / work
instructions must be observed.
o Take appropriate measures to ensure
that moving/detached parts are im-
mobilized during the work and that no
body parts can be pinched by unintended
movements.
o Assemble the product only outside the
operating range of moving parts, at an
adequate distance from sources of heat
or cold.
o Prior to performing work, the product
and the machine/system in which the
product will be integrated must be de-
energized and depressurized and secured
against unauthorized activation.
o All work on electrical components may be
performed only with voltage-insulated
tools.
1.6 Assembly/maintenance/malfunction/
decommissioning/disposal
WARNING
Electric shock
De-energize the product prior to
beginning work.
Only qualified, trained personnel
authorized by the operator may
perform work on the Lubrication
Monitor Controller.
Local conditions for connections
and local regulations (e.g., DIN,
VDE) must be observed.
Serious injury or death and property
damage may result from improp-
erly connected products.

1. Safety instructions
1.7 Intended use 1.8 Foreseeable misuse
Any usage of the product differing from the
aforementioned conditions and stated pur-
pose is strictly prohibited.
Particularly prohibited are:
o Use for other control tasks.
o Use in a more critical explosion zone.
o Use to feed, forward, or store hazardous
substances and mixtures as defined in
Annex I Part 2-5 of the CLP Regulation
(EC 1272/2008).
o Use to feed / forward / store gases, liq-
uefied gases, dissolved gases, vapors,
or fluids whose vapor pressure exceeds
normal atmospheric pressure (14,69 psi/
1013 mbar) by more than 0.5 bar at
their maximum permissible operating
temperature.
The Lubrication Monitor Controller is used
for controlling to max. three pumps, each
with one to three zones (one-line to three-
line) SKF Single Line centralized lubrication
systems.
On LMC 301 designs 086501 and 086503
(IO Board), the power supply is provided via
a customer-supplied 110/230 VAC net-
work. They must be connected according to
DIN and VDE or national active lungs/laws.
On LMC 301 designs 086500 and 086502
(IO Board), the power supply is provided
via 24 V DC.
The technical information contained in this
manual must be observed.
Any other usage is deemed non-compliant
with the intended use.
11
1
ENEN
o Fuses must not be bridged. Always re-
place fuses with fuses of the same type.
o Ensure proper grounding of the product.
o Drill holes required for assembly only on
non-critical, non-load-bearing parts.
o Other units of the machine/the vehicle
must not be damaged or impaired in their
function by the installation.
o No parts of the centralized lubrication
system may be subjected to torsion,
shear, or bending.
o Use suitable lifting gear when working
with heavy parts.
o Avoid mixing up/incorrectly assembling
disassembled parts. Label parts.

1. Safety instructions
12
ENEN
1.9 Disclaimer of liability
The manufacturer shall not be held liable for
damage resulting from:
o Failure to comply with these instructions.
o The use of lubricants/media not approved
for the unit type.
o Contaminated or unsuitable lubricants.
o Installation of non-original SKF
components.
o Inappropriate usage.
o Improper assembly, configuration or filling.
o Improper reaction to malfunctions.
o Non-observance of maintenance intervals.
o Independent modification of system
components.
1.10 Referenced documents
In addition to this manual, the following
documents must be observed by the re-
spective target group:
o Operational instructions/approval rules.
o Instructions from suppliers of purchased
parts.
o Manual for the insulation resistance tester
o Project planning documents and other
relevant documents
The operator must supplement these docu-
ments with applicable regulations for the
country of use.
The documentation must be included if the
product is transferred to a new operator.
1.11 Warning labels on the product
The following warning labels are affixed to
the product. Before commissioning, check
that the labels are present and intact.
Immediately replace warning labels if dam-
aged or missing. The product must not be
operated until then. See the positioning
diagram for the order number and position
on the product.
Positioning of warning labels, Fig. 1
Order No. : 246-078-289
Order No : 44-1826-3122

1. Safety instructions
13
1
ENEN
1.12 Residual risks
Table 1
Residual risk Remedy
Life cycle: Assembly/commissioning/operation/setup and retrofit
Electric shock due to defective or incor-
rectly connected power lead on power
supply or load relay
• Inspect the power lead for damage before starting the product
• Correctly wire/connect the power lead
Tearing/damage to lines when installed
on moving machine components
• When installed on movable equipment use flexible lines
Life cycle: Malfunction, troubleshooting, maintenance, repair/decommissioning and disposal
Electric shock due to defective power
lead on power supply
• Inspect the power lead for damage before starting the product
Electric shock from open control cabinet
or active energized components
• Disconnect the customer-provided main switch or mains plug (cut power) before performing
any work on electrical components
• Exercise caution when operating the product

2. Overview/System description
Display, Fig. 2
PUMP A B C
RUN
LL
FA U LT
POWER
RESET
LMC 301
2. Overview/System description
PUMP A B C
RUN
LL
FA U LT
POWER
RESET
LMC 301
CAUTION!
Do not use rigid electrical conduits.
ACHTUNG!
keine starren Elektroinstallations-
rohre verwenden.
PUMP A B C
RUN
LL
FAULT
POWER
RESET
LMC301
14
The installation of the cable glands and the customer provided cord sets to be
done by the customer. The customer is responsible for proper installation.
Cable glands and conduits -see chapter Accessories, page 83.
When mounting the customer connecting cable no rigid connection pipe must be
used - see sign (1) on the controller ground.
1
EN

2. Overview/System description
15
2
Status Overview and triggering an additional lubrication
Symbol Status Function
Press the arrow key to receive a status overview of the pumps resp. zones
(P1Z1 = Pump 1/Zone1 to max. P3Z3 Pump 3/Zone 3).
Press the arrow key again to display the residual pause time resp. residual runtime of the currently
selected pump/zone (e. g. P1Z1).
Press the arrow key again to display the activated inlets of the currently selected pump/zone.
Press the arrow key again to display the activated outlets of the currently selected pump/zone.
Press the "additional lubrication" key shortly to carry out an additional lubrication of the entire system
respectively of the activated zones (P1Z1 = pump 1/zone1 to max. max. P3Z3 pump 3/zone 3).
Overview States
P1Z1
P1Z2
P1Z3
States/Timer P1Z1
P1Z1
State: Hold (Pause/Lube)
Cycle Time:
Inputs (1) P1Z1
State: Lube
Outputs (1) P1Z1
State: Lube
Pump: O
Valve A/B: O
Additional lubrication
komplett
P1Z1
P1Z2
P1Z3
EN

2. Overview/System description
Display and control elements of control screen
Symbol Designation Function
Display o Menu display / Display of values and parameters / Fault notification
o The right bar ( ) indicates that the menu extends beyond the current display
PUMP PUMP
Pumps A B C
Pump / main line A / B / C per pump
Max. of 3 main lines possible
RUN RUNning
Active control
LED lights up =
Indication of currently active pump/active control line (A/B/C)
LL Low Level
Minimum fill level reached
LED lights up =
Minimum fill level (pump A/B/C) reached
FA U LT FA U LT
Error notification
o LED flashes = Error detected
o LED lights up = Fault present
POWER POWER
Control unit On/Off
LED lights up = Control unit switched on
Function keys Control key in combination with the display above the key
Up arrow key menu control <Back menu level> / increase input value
"Down" arrow key menu control <Forward menu level> / reduce input value
Pressing triggers an interim lubrication.
Briefly pressing starts all systems
Actuations while in configuration mode are ignored.
RESET
Long pressing (> 3 seconds) stops all systems or resets an error message.
Long pressing acknowledges and clears error messages.
RESET
16
EN

2. Overview/System description
Display elements of the control screen
Symbol Status Function
Stopped/OFF o The system was stopped by pressing the Reset key and can
be restarted by briefly pressing the Running key.
Pause o Respective lubrication zone is in interval time
Wait Temperature o Waiting period temperature
Wait o Lubrication zone waiting because another zone currently
being lubricated
Lube o System is lubricating
Hold o Holding time
Pressure relief o System is relieving pressure
Runtime o Pump is running
Secured/
access denied o No access as local admin or supervisor
Access o Access as local admin or supervisor
Fault o Fault is present
Digital inputs and
outputs on o Digital output is enabled
Digital inputs and
outputs off o Digital output is disabled
T
!
2.1 LMC 301 controller unit
The SKF LMC 301 Controller is used to
control SKF Single Line centralized
lubrication systems.
Depending on the system design, up to
three independent lubrication zones can be
controlled.
The SKF LMC 301 controller handles control
and monitoring of the system. The current
system status is shown on the LMC 301
controller's display. The user can quickly
adapt the lubrication procedure by changing
the lubrication intensity
<<Normal Cycle Set to Heavy Cycle Set>>.
The SKF LMC 301 Controller offers the
following pump settings according to the
system design:
o Up to three lubricant pumps.
o Up to three lubrication zones (zones 1
to 3) per pump (main lines 1 to 3).
o Type of zone valves via 2/2 or
3/2 directional solenoid valves.
o Time- or pressure-based lubrication
monitoring.
17
2
EN

2. Overview/System description
o Pump control and monitoring.
o Temperature monitoring by internal or
external sensor.
o Automatic filling.
The SKF LMC 301 controller offers configu-
rations for the following zone settings for
each zone:
o Cycle Control, control mode time-based
or counter-based.
o Cycle Control for "light" or "heavy"
machine requirement with according
selection of "Light" or "Heavy" lubrication.
o Lubrication settings, setting of lubrication
time or, with counter control, the number
of pulses delivered by the machine.
o Flow rate monitoring.
o Alarm outputs and defined fault
diagnostics.
Some system settings and timings can be
modified by the customer via the password
level Local Admin.
The previous settings can also be reset
to the default settings via the menu item
Set Params to Default.
)See Figure 3 on page 20
The following descriptions applies to a Single
Line centralized lubrication system with two
zones (two main lines).
The two zones are relieved via a reversing
valve downstream of the pump unit.
Both main lines are switched via a 2/2
directional solenoid valve upstream of the
respective main line.
Prelubrication or relubrication distributors
can be used as the Single Line distributors.
Depending on the design, the changeover
signal is sent by a shared pressure switch
(PT) or a pressure switch assigned to one of
the zones.
The pressure switch(es) can be designed as
NO-contacts (close when pre-defined pres-
sure is reached) or NC contacts (open when
pre-defined pressure is reached).
The fill level is monitored by a fill level switch
in the pump reservoir.
It can be designed as a NO-contact or an NC
contact.
2.2 General design of a Single Line
centralized lubrication system
18
EN

2. Overview/System description
Another system design involves using
3/2 directional solenoid valves instead of the
2/2 directional solenoid valves. In that case,
pressure is relieved via an additional relief
line (7).
This system design does not require an ad-
ditional relief valve.
2.2.1 System design
)See Figure 3 on page 20
Pressure is built up from the pump element
(1) via the mechanical pressure relief valve
(2) and the downstream main lubrication
line (3) to the solenoid valves of zone 1 (4)
and zone 2 (5), and from there to the down-
stream Single Line distributors (6).
The pump feeds lubricant via the mechanical
pressure relief valve (2) and the main line
(3) to both solenoid valves of zone 1 (4) and
zone 2 (5).
Depending on the programming, one of
the two solenoid valves is open, resulting
in pressure build-up of the lubricant in the
corresponding zone, while the other solenoid
valve is closed.
The lubrication proceeds as follows on a
Single Line centralized lubrication system
with prelubrication distributors:
The pump feeds lubricant to the respec-
tive zone (main line) until all prelubrication
distributors have dispensed their defined
quantity of lubricant to the respective lu-
brication lines. The pressure switch sends a
signal to the controller that the changeover
is finished. The controller then switches off
the pump and the mechanical pressure re-
lief valve (2), which leads to pressure relief in
the main line and the previously active zone
(main line).
The active solenoid valve (4 or 5) switches
to an open state once its holding time has
elapsed.
After pressure relief has been performed,
the zones (main lines) are prepared for an-
other lubricating cycle.
The lubrication proceeds as follows on a
Single Line centralized lubrication system
with relubrication distributors:
The pump feeds lubricant to the respective
zone (main line) until a predefined pressure
is reached. The pressure switch (PT) then
switches and sends a signal to the controller.
The controller switches off the pump and
19
2
EN

2. Overview/System description
switches the pressure relief valve to relief,
resulting in pressure relief in the main line
and the previously active zone (main line).
This causes the relubrication distributors to
relieve pressure, and lubricant is delivered to
the respective lubrication lines.
The active solenoid valve (4 or 5) switches
to an open state once its holding time has
elapsed.
After pressure release has been performed,
the system is now prepared for another lu-
bricating cycle.
The pump fill level is monitored by a fill level
switch in the pump reservoir.
2/2 directional solenoid valves and relief valve
3/2 directional solenoid valves and relief line
Zone 1 (main line 1)
Zone 2 (main line 2)
Zone 1 (main line 1)
Zone 2 (main line 2)
System diagrams of Single Line centralized lubrication systems, Fig. 3
M
T
P
PT
M
T
P
PT
PT
20
EN