MAYSER SG-RS 309-2 User manual

Control unit SG-RS 309-2
Original instructions
1006747 SG-RS 309-2 DC 24 to 36 V / 8k2, 10k
Mayser GmbH & Co. KG
Örlinger Straße 1–3
89073 Ulm
GERMANY
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.mayser.com
Innovative by tradition.
Version 1
EN | Operating instructions

Page 2/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Copyright
The reproduction, distribution and utilization of this document as well as the communication of its contents with-
out express authorization are prohibited. Oenders will be held liable for the payment of damages. All rights re-
served in the event of the grant of a patent, utility model or design.
© Mayser Ulm 2021
Safety first!
•Read the manual carefully before use.
•Warning signs in the manual warn of unexpected dangers. Always ob-
serve warning signs.
•Retain the manual throughout the service life of the product.
•Pass the manual on to every subsequent owner or user of the product.
•Insert every supplement received from the manufacturer into the man-
ual.
•Observe chapter on Safety starting on page 5.
Conformity
EC design test
The product was tested by an independent institute.
An EC design type test certificate confirms conformity.
The EC design type test certificate is available in the download section of the website:
www.mayser.com.
The Declaration of Conformity is available in the download section of the website:
www.mayser.com.
The design type of the product complies with the basic requirements of the following
directives:
•2006/42/EC (Safety of Machinery)
•2011/65/EU (RoHS)
•2014/30/EU (EMC)

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 3/23
Inhaltsverzeichnis
Contents
About this manual .................................................................................................................................................................4
Safety..........................................................................................................................................................................................5
Intended use .........................................................................................................................................................................5
Safety instructions................................................................................................................................................................5
Residual dangers ..................................................................................................................................................................6
Parts supplied ..........................................................................................................................................................................7
Storage ......................................................................................................................................................................................7
Product overview....................................................................................................................................................................7
Connections...........................................................................................................................................................................7
LED indicators........................................................................................................................................................................8
Operation..................................................................................................................................................................................8
Reset........................................................................................................................................................................................9
Automatic reset........................................................................................................................................................9
Controlled reset........................................................................................................................................................9
Manual reset ..........................................................................................................................................................10
Installation..............................................................................................................................................................................11
Reset..................................................................................................................................................................................... 12
Automatic reset..................................................................................................................................................... 12
Controlled reset.....................................................................................................................................................12
Manual reset ..........................................................................................................................................................13
Signal outputs.................................................................................................................................................................... 13
Connection examples ......................................................................................................................................................13
Commissioning......................................................................................................................................................................15
Testing.................................................................................................................................................................................. 15
Automatic reset..................................................................................................................................................... 15
Controlled reset and manual reset................................................................................................................... 16
Pressure-sensitive protection device actuated........................................................................................................... 17
Correlations ........................................................................................................................................................................18
Decommissioning .............................................................................................................................................................18
Recommissioning.............................................................................................................................................................. 18
Maintenance and cleaning................................................................................................................................................19
Maintenance ......................................................................................................................................................................19
Cleaning ..............................................................................................................................................................................19
Troubleshooting and remedies ........................................................................................................................................19
Replacement parts ...............................................................................................................................................................21
Disposal ...................................................................................................................................................................................21
Technical data........................................................................................................................................................................22

Page 4/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
About this manual
About this manual
This manual is valid only for the product specified on the title page.Validity
This manual is intended for the owner and electricians. The electrician must be famil-
iar with the installation and commissioning.
Target group
ÄAlso observe the following documents:
-Drawing of the sensor system (optional)
-Wiring diagram (optional)
-Installation instructions of the sensors used
Other applicable
documents
Symbols used Symbol Meaning
Ä... Action with one or more steps whose order is not rele-
vant.
1. ... Action with several steps whose order is relevant.
• ...
- ...
Bullets first level
Bullets second level
(see Section Installation) Cross-reference
Danger symbols and
information
Symbol Meaning
DANGER Immediate danger leading to death or serious injury.
WARNING Imminent danger which may lead to death or serious injury.
CAUTION Possible danger which may lead to minor or moderate inju-
ries.
NOTE Potential danger of property damage or environmental deg-
radation.
Information on easier and safer working practices.
This manual is an integral part of the product.
Mayser will assume no liability and provide no guarantee whatsoever for damages
and consequential damages resulting from failure to comply with the manual.
Dimensions in draw-
ings
Unless otherwise indicated, all dimensions are stated in millimetres (mm).

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 5/23
Safety
Intended use
Safety instructions
The control unit is designed for signal processing of a pressure-sensitive protective
device (PSPD). It evaluates the output signals of sensors with monitoring resistor 8k2
or 10k. The integrated output signal switching devices (OSSD) transmit the evaluated
safety signals directly to the downstream control.
The product complies with ISO13849-1:2015 Category 3 PLd. So that the
safety classification is retained, the downstream control must be of the same or a
higher category.
Safety
ÄDo not open the control unit
Never open, tamper with or alter the control unit.
To prevent irreparable damage to the product, the following safety instructions ap-
ply.
ÄDo not use in ATEX zones
Do not use the control unit in potentially explosive environments (ATEX). The
control unit is not authorised for use in these zones.
ÄDisable in case of error
Disable the safety device in case of malfunctions or visible damage.
ÄPrevent restarting of the machine
As long as a hazard continues to exist, take measures to prevent the machine
from restarting, for example by means of a startup lockout.
ÄPrevent electric shock
When working on electrical systems, always disconnect them from the power
supply and secure them against being switched on again, to prevent injuries from
electric shock.
ÄEnsure careful configuration of interface
The quality and reliability of the interface between the safety device and the ma-
chine aects the overall safety. Take special care when setting up this interface.
For your own safety the following safety instructions apply.
The product has been developed taking EN 50155 into consideration and is suitable
for rail applications.

Page 6/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Safety
Die Klemmen Y1, Y2 und Y3, Y4 sind nicht potenzialfrei.
Residual dangers
There are no known residual dangers associated with this product.
ÄContinue redundancy
Make sure you wire the unit directly in the control circuit or that the downstream
control is also in dual channel mode.
ÄDo not cross link control unit
Do not cross link the control unit with other control units.
ÄFit spark absorbers
When connecting inductive loads, fit spark absorbers (RC modules) to the con-
sumer.
ÄCheck supply voltage
Check supply voltage. It must correspond with the connecting voltage USon the
type plate.
ÄObserve pin assignment
Observe pin assignment when connecting the supply voltage.
ÄDo not overload control unit
Ensure that the specified switching current is not exceeded.
ÄDo not exceed the maximum number of sensors
Do not connect more sensors on the control unit, than the number specified in
the installation instructions of the sensors.
ÄMaintain distance
When installing in the switch cabinet, ensure sucient distance from heat sourc-
es (at least 2 cm).
ÄProtect against strong electromagnetic signals
Protect the control unit against excessive EMC radiation. A strong electromagnet-
ic signal can cause the control unit to switch to a safe OFF state.
ÄObserve degree of protection
Only use the control unit in rooms with a minimum degree of protection of IP54
(e.g. switch cabinet).

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 7/23
Parts supplied
Terminals: Connections:
A1, A2 Supply voltage
Input Sensor:
Y1, Y2 Sensor 1
Y3, Y4 Sensor 2
Reset
S13, S15 Bridge automatic reset
S14, S15 Bridge automatic reset
S13, S14 Button for manual reset
S14 Input controlled reset
Monitoring circuit 1 (Sensor 1)
12 Semiconductor output OSSD 1.1
32 Semiconductor output OSSD 1.2
M1 Signal output
Monitoring circuit 2 (Sensor 2)
22 Semiconductor output OSSD 2.1
42 Semiconductor output OSSD 2.2
M2 Signal output
11, 14; 31, 34 without function
21, 24; 41, 44 without function
Parts supplied
1× Control unit
Enclosure with electronics module and plug-in connectors.
1× Operating instructions
1× Declaration of Conformity
ÄUpon receipt of the parts supplied, check immediately for completeness and
good condition.
ÄStore the control units in the original package, in a dry place.
ÄComply with the storage temperature specified in the technical data.
Storage
Product overview
Connections

Page 8/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Operation
The single-fault-safe electronics module has dual channels (redundant). Two moni-
toring circuits each control two semiconductor outputs (OSSD 1.1, 1.2 and 2.1, 2.2)
and regularly monitor them to make sure they are working. The electronics monitor
the electrical resistance of the connected sensors which have a defined closed-circuit
current.
•green LED „P“ (Power):
Supply voltage connected
•yellow LED „S1“ (Sensor 1):
Sensor 1 activated
•yellow LED „S2“ (Sensor 2):
Sensor 2 activated
•red LED „F“ (Fault):
Fault / Error
If there is a cable break between sensor 1 and the control unit, all OSSDs from mon-
itoring circuit 1 and 2 are in OFF state, signal outputs M1 and M2 are HIGH. The yel-
low LED “S1” and the red LED “F” are flashing.
If there is a cable break between sensor 2 and the control unit, all OSSDs from mon-
itoring circuit 1 and 2 are in OFF state, signal outputs M1 and M2 are HIGH. The yel-
low LED “S1” and the red LED “F” are flashing.
If sensor 1 is activated, then the OSSDs from monitoring circuit 1 are in OFF state,
signal output M1 is HIGH. The yellow LED “S1” is lit up. If sensor 2 is activated, then
the OSSDs from monitoring circuit 2 are in OFF state, signal output M2 is HIGH. The
yellow LED “S2” is lit up. If sensor 1 and sensor 2 are activated, then the OSSDs from
monitoring circuit 1 and monitoring circuit 2 are in OFF state, signal outputs M1 and
M2 are HIGH. The yellow LEDs “S1” and “S2” are lit up.
The control unit is powered with DC24 to 36V. When the supply voltage is connect-
ed, the green LED“P“ is lit.
When the sensors are not activated, the OSSDs from monitoring circuit 1 (OSSD 1.1,
OSSD 1.2) and monitoring circuit 2 (OSSD 2.1, OSSD 2.2) are in the ON state. The sig-
nal outputs from monitoring circuit 1 (M1) and monitoring circuit 2 (M2) are LOW.
If sensor 2 is not connected, then all specifications for monitoring circuit 2 can be ig-
nored.
Operation
If the control unit is being operated with only one sensor (monitoring circuit 2 inac-
tive), then it needs to be connected to terminals Y1 and Y2. Terminals Y3 and Y4 for
sensor 2 remain unconfigured.
LED indicators
Ready for operation
Sensor activated
Sensor cable break
Terminology: ON state,
OFF state according to
ISO13856

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 9/23
Operation
If the defined signal pulse of the higher-level control is applied to terminal S14, the
output signal switching device changes from the OFF to the ON state again with a
delaytw.
Reset signal
control
Reset
no
yes
If a functioning sensor is connected again after a cable break, the device remains in
fault mode. The respective yellow LED “S1” or “S2“ and the red LED “F“ continue flash-
ing, the OSSDs of both monitoring circuits remain in OFF state and the signal outputs
at HIGH. An interruption of at least 500 ms to the supply voltage will reset the fault
mode. A detected cable break which is not fixed on monitoring circuit 2 is no longer
registered after restarting the control unit (supply voltage interruption of < 500 ms).
Monitoring circuit 2 becomes inactive and its OSSDs remain in OFF state. The control
unit is now in the mode: Monitoring circuit 2 inactive.
Fault
no
yes
Automatic reset
Reset
The control unit operates without a reset function. If the pressure-sensitive protection
device is no longer actuated, the output signal switching device of the control unit
automatically changes from the OFF state to the ON state. Without additional start
interlock, the machine would start up again immediately.
The control unit operates with a reset function. If the pressure-sensitive protection
device is no longer actuated, the output signal switching device of the control unit is
in OFF state. This prevents restart of the machine. Only the manual reset command
eectuates the change from the OFF state to the ON state.
Controlled reset
A HIGH signal at terminal S15 triggers a reset.
Conditions for the signal pulse of the higher-ranking control system:
-Signal duration min. / max. 60 ms / 13 s
-Signal voltage min. / max. 10 V / 24 V

Page 10/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Operation
If the reset button is pressed, the OSSDs return to the ON state again with a delay tw.
Reset signal
button
Reset
no
yes
Fault
no
yes
Manual reset
The control unit monitors the reset button and detects a malfunction via the actua-
tion period. The conditions for this are:
-Signal duration min. / max. 60 ms / 13 s
If the actuation period is not reached, then reset will not take place.
If the actuation period max. is exceeded, the control unit changes to the mode:
“Fault/System error” (see Chapter Troubleshooting and remedies).
No reset will take place if the signal pulse min. is not reached or the pulse voltage is
not maintained.
If the signal pulse max. is exceeded, the control unit changes to the mode:
“Fault/System error” (see Chapter Troubleshooting and remedies).
The control unit operates with a reset function. If the pressure-sensitive protection
device is no longer actuated, the output signal switching device of the control unit is
in OFF state. This prevents restart of the machine. Only the manual reset command
eectuates the change from the OFF state to the ON state.

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 11/23
Installation
Installation
Caution: Functional impairment due to overheating
If the control unit is overheated due the eects of external heat, this can result in
functional impairment or failure of the pressure-sensitive protection device.
ÄAlways ensure sucient distance from heat sources (at least 2 cm).
1. Mount the control unit in any position on a 35mm mounting rail type IEC60715.
For your safety, the well-known safety rules also apply for assembly:
•Disconnect all devices and live parts in the immediate vicinity from the power
supply.
•Ensure that all devices and live parts cannot be switched back on.
•Test to ensure that all devices and live parts are disconnected from the power
supply.

Page 12/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Installation
2. Wire the sensors, semiconductor outputs and supply voltage to the cable termi-
nals
The OSSDs 1.1, 1.2, 2.1 and 2.2 are semiconductor outputs (PNP) and short-circuit-
proof. In the HIGH state (ON state) the voltage US-3% tolerance is applied, depend-
ing on the voltage load and supply voltage.
The reset (with reset function) can be set up using a higher-level control (or a push-
button):
This applies for the outputs:
ÄWire the load between the output terminal and A2.
Automatic reset
Bridges must be set for an automatic reset (without reset function).
ÄPlace the bridges between cable terminals S13 and S15 and also between S14
and S15.
Reset
Control
system
autom.
Reset
R1 = 8k2 or 10k
R2 = 8k2 or 10k
1 2
Monitoring cir-
cuit 1
Monitoring cir-
cuit 2
SensorSensor
Reset
Controlled reset
ÄWire the control output to cable terminal S14.
Terminals S13 and S15 remain unconfigured.

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 13/23
Installation
The signal outputs M1 (sensor 1) and M2 (sensor 2) are semiconductor outputs (PNP)
and short-circuit-proof. In the HIGH state, the voltage US-3% tolerance is applied,
depending on the voltage load and supply voltage.
This applies for signal outputs:
ÄWire the load between the output terminal and A2.
man.
Reset
NOTE
In an electromagnetic extreme case (surge pulse) the signal outputs may flicker.
This does not aect the safety function.
ÄProtect the control unit from excessive EMC radiation.
ÄWire up a button between cable terminals S13 and S14.
Terminal S15 remains unconfigured.
Connection examples
Connection examples 1
Manual reset
Signal outputs
Monitoring
circuit 1
Monitoring
circuit 2
higher-level
control

Page 14/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Installation
Connection examples 2
Manual reset
Monitoring
circuit 1
Monitoring
circuit 2
Reset
higher-level
control
Contact duplication
• • •
Monitoring
circuit 1
Monitoring
circuit 2
Reset
Monitoring
circuit 1
Monitoring
circuit 2

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 15/23
Commissioning
1. Make sure that everything is connected and no sensor is activated.
-green LED “P“ is lit
-OSSDs from monitoring circuit 1 and monitoring circuit 2 in ON state
-signal outputs M1 and M2 at LOW
3. Repeat step 1.
2. Actuate sensor 1.
-yellow LED “S1“ is lit
-OSSDs from monitoring circuit 1 in OFF state
-signal output M1 at HIGH
5. Repeat step 1.
6. Disconnect sensor 1.
-yellow LED “S1“ and red LED ”F“ are flashing
-OSSDs from monitoring circuit 1 and 2 in OFF state
-signal outputs M1 and M2 at HIGH
7. Repeat step 1.
8. Disconnect the power supply for at least 500 ms.
-the control unit will restart
4. If connected, activate sensor 2.
-yellow LED “S2“ is lit
-OSSDs from monitoring circuit 2 in OFF state
-signal output M2 at HIGH
Commissioning
1. Make sure the plug connections are firmly attached.
2. Connect the supply voltage.
Testing
WARNING: Danger of injury due to electrocution
ÄNever unplug plug connections with the power on.
Automatic reset

Page 16/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Commissioning
1. Make sure that everything is connected and no sensor is activated.
-green LED “P“ and the LEDs “S1“ and “S2“ are lit
-OSSDs from monitoring circuit 1 and 2 in OFF state
-signal outputs M1 and M2 at HIGH
2. Initiate a reset signal by the higher-level control or press the reset button.
-green LED “P“ is lit
-OSSDs from monitoring circuit 1 and monitoring circuit 2 in ON state
-signal outputs M1 and M2 at LOW
10. Repeat step 1.
11. Disconnect the power supply for at least 500 ms.
-the control unit will restart
9. If connected, disconnect sensor 2.
-yellow LED “S2“ and red LED ”F“ are flashing
-OSSDs from monitoring circuit 1 and 2 in OFF state
-signal outputs M1 and M2 at HIGH
6. Repeat steps 1 and 2.
7. Disconnect sensor 1.
-yellow LED “S1“ and red LED ”F“ are flashing
-OSSDs from monitoring circuit 1 and 2 in OFF state
-signal outputs M1 and M2 at HIGH
8. Repeat step1.
4. Repeat steps1 and 2.
5. If connected, activate sensor 2.
-yellow LED “S2“ is lit
-OSSDs from monitoring circuit 2 in OFF state
-signal output M2 at HIGH
3. Actuate sensor 1.
-yellow LED „S1“ is lit
-OSSDs from monitoring circuit 1 in OFF state
-signal output M1 at HIGH
Controlled reset and manual reset
When the functional test has been successfully completed the pressure-sensitive pro-
tection device is ready for operation.
If the functional test was faulty, see chapter Troubleshooting and remedies.

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 17/23
Commissioning
9. Disconnect the power supply for at least 500 ms.
-the control unit will restart
10. Repeat step2.
11. If connected, disconnect sensor 2.
-yellow LED “S2“ and red LED ”F“ are flashing
-OSSDs from monitoring circuit 1 and 2 in OFF state
-signal outputs M1 and M2 at HIGH
12. Repeat step1.
13. Disconnect the power supply for at least 500 ms.
-the control unit will restart
14. Repeat step2.
As long as the pressure-sensitive protection device remains actuated, the output sig-
nal switching devices of the control unit remain in the safe OFF state.
If actuation of the pressure-sensitive protection device ends, dierent states are pos-
sible on the output signal switching devices of the control unit. This depends on the
selected reset type (see chapter Operation, subchapter Reset).
Pressure-sensitive protection device actuated
When the functional test has been successfully completed the pressure-sensitive pro-
tection device is ready for operation.
If the functional test was faulty, see chapter Troubleshooting and remedies.

Page 18/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Commissioning
LEDs Outputs Meaning
“P“
green
“ S1“
yellow
“ S2“
yellow 1)
“F“
red 1.1, 1.2 2.1, 2.2
1)
M1 M2
1)
LED o: LED on:
LED flashing:
OFF state OFF state LOW LOW Supply voltage o
ON state ON state LOW LOW Control unit ready
OFF state ON state HIGH LOW Sensor 1 actuated
ON state OFF state LOW HIGH Sensor 2 actuated
OFF state OFF state HIGH HIGH Fault at sensor 1 (cable break)
OFF state OFF state HIGH HIGH Fault at sensor 2 (cable break)
OFF state OFF state HIGH HIGH Fault / Systemerror
OFF-/ON-
state OFF state HIGH HIGH
Fault monitoring circuit 1; OSSD
1.1: OFF state and 1.2: ON state
or OSSD 1.1: ON state and 1.2:
OFF state
OFF state OFF-/ON-
state HIGH HIGH
Fault monitoring circuit 2; OSSD
2.1: OFF state and 2.2: ON state
or OSSD 2.1: ON state and 2.2:
OFF state
Recommissioning
ÄCarry out commissioning (see chapter Commissioning).
Decommissioning
ÄSwitch o the pressure-sensitive protection device and safeguard it from being
switched back on unintentionally.
ÄAx a clear warning on the pressure-sensitive protection device warning that
states it is temporarily or definitively decommissioned.
Correlations
1) Only applies if sensor 2 is connected.

110321v1.01-RiO Operating instructions SG-RS 309-2 Page 19/23
Maintenance and cleaning
Fault display Possible cause Elimination
green LED “P“ not lit up No or incorrect supply voltage 1. Check supply voltage, compare with
type plate
2. Check terminal connections
If supply voltage is correctly connected:
control unit is faulty
ÄReplace control unit
yellow LED “S1“ is lit Sensor 1 is faulty 1. Measure resistance at sensor 1: Set val-
ue = 8k2 ±5% or 10k ±5%
2. Actual value ≠ set value: Sensor faulty
3. Replace sensor
Control unit is faulty 1. Connect 8k2 or 10k resistor to termi-
nals Y1, Y2
2. Fault not remedied: Replace control
unit
yellow LED “S2“ is lit Sensor 2 is faulty 1. Measure resistance at sensor 2: Set val-
ue = 8k2 ±5% or 10k ±5%
2. Actual value ≠ set value: Sensor faulty
3. Replace sensor
Control unit is faulty 1. Connect 8k2 or 10k resistor to termi-
nals Y3, Y4
2. Fault not remedied: Replace control
unit
Cleaning
ÄClean the outside of the enclosure with a dry cloth.
Maintenance and cleaning
Maintenance
The control unit is maintenance-free.
ÄRepeat the operational test monthly.
Troubleshooting and remedies
Prerequisite: the control unit is connected to the supply voltage and sensor. No sen-
sor is activated.

Page 20/23 Operating instructions SG-RS 309-2 110321 v1.01-RiO
Troubleshooting and remedies
Fault display Possible cause Elimination
yellow LED “S1“ and red
LED “F“ are flashing
Sensor not connected or incorrectly con-
nected to terminal Y1 and Y2
ÄConnect sensor
Cable break at sensor 1 1. Measure resistance at sensor 1: Set val-
ue = 8k2 ±5% or 10k ±5%
2. Actual value > 1M: Sensor faulty
3. Replace sensor
4. Disconnect power supply for at least
500 ms
yellow LED “S2“ and red
LED “F“ are flashing
Sensor not connected or incorrectly con-
nected to terminal Y3 and Y4
ÄConnect sensor
Cable break at sensor 2 1. Measure resistance at sensor 2: Set val-
ue= 8k2 ±1% or 10k ±1%
2. Actual value > 1M: Sensor faulty
3. Replace sensor
4. Disconnect power supply for at least
500 ms
green LED “P“, yellow
LEDs“S1“ and/or “S2“
are lit
manual reset:
- no reset signal from higher-level
control or reset button not pressed
- signal duration / activation period
too short
ÄInitiate transmission signal from con-
troller or press reset button (≥ 60 ms)
manual reset: connection to control or to
button interrupted
ÄCheck connection
automatic reset: bridges missing ÄPlace bridges between S13 and S15 as
well as between S14 and S15
Control unit is faulty ÄReplace control unit
green LED “P“, yellow
LEDs“S1“ and “S2“ are lit,
red LED “F“ is flashing
manual reset: duration of transmission
signal from higher-level control too long or
button jammed
ÄCheck the duration of the transmission
signal (≤ 13 s) of the higher-level con-
trol or replace reset button on S13 and
S14
Control unit is faulty ÄReplace control unit
The fault can still not be removed?
ÄContact Mayser support: Phone [phone].
ÄIn case of queries, have the information on the type plate at hand.
Type plate A type plate for identification of the control unit is axed on the side.