MAYSER SG-RS 309-2 User manual

Control unit SG-RS 309-2
Original instructions
Mayser GmbH & Co. KG
Örlinger Strasse 1–3
89073 Ulm
GERMANY
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Website: www.mayser.com
Innovative by tradition.
1006747 SG-RS 309-2 24 to 36VDC
Version 1
EN | Operating instructions

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 2/23
Copyright
The reproduction, distribution and utilisation of this document as well as the communication of its contents
without express authorisation is prohibited. Oenders will be held liable for the payment of damages. All
rights reserved in the event of the grant of a patent, utility model or design.
© Mayser Ulm 2022
Safety first!
•Read the instructions carefully before use.
•The warnings in the instructions are there to warn you of any unex-
pected dangers. Always heed the warnings.
•Keep the instructions somewhere safe so you can refer to them
throughout the product’s entire service life.
•Pass the instructions on to every subsequent owner or user of the
product.
•Add any supplement received from the manufacturer to the instruc-
tions.
•Observe the information under “Safety” (starting on
page5).
Conformity
The Declaration of Conformity is available in the Downloads section of our web-
site: 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)
EC type examination
The product was tested by an independent institute.
There is an EC type examination certificate to confirm conformity.
The EC type examination certificate is stored in the Downloads section of our
website: www.mayser.com.
The Declaration of Conformity is available in the Downloads section of our web-
site: www.mayser.com.
The design type of the product complies with the basic requirements of the fol-
lowing UK Statutory Instruments:
•2008 No. 1597 (Machinery)
•2012 No. 3032 (RoHS)
•2016 No. 1091 (EMC)

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 3/23
Table of contents
Table of contents
About these instructions......................................................................................................................................................4
Safety..........................................................................................................................................................................................5
Intended use .........................................................................................................................................................................5
Safety instructions................................................................................................................................................................5
Residual dangers ..................................................................................................................................................................6
Parts supplied ..........................................................................................................................................................................7
Storage ......................................................................................................................................................................................7
Product overview....................................................................................................................................................................7
Connections...........................................................................................................................................................................7
LEDs information..................................................................................................................................................................8
Function ....................................................................................................................................................................................8
Reset........................................................................................................................................................................................9
Automatic reset........................................................................................................................................................9
Controlled reset........................................................................................................................................................9
Manual reset ..........................................................................................................................................................10
Installation..............................................................................................................................................................................11
Reset..................................................................................................................................................................................... 12
Automatic reset..................................................................................................................................................... 12
Controlled reset.....................................................................................................................................................12
Manual reset ..........................................................................................................................................................12
Signal outputs.................................................................................................................................................................... 13
Connection examples ......................................................................................................................................................13
Commissioning......................................................................................................................................................................15
Testing the function..........................................................................................................................................................15
Automatic reset..................................................................................................................................................... 15
Controlled reset and manual reset...................................................................................................................16
Protective device activated............................................................................................................................................. 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

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 4/23
About these instructions
Symbols used Symbol Meaning
Ä… Action with one step or with more than one step
where the order is not relevant.
1. … Action with more than one step where the order is
relevant.
• …
-…
Bullets first level
Bullets second level
(see 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 moder-
ate injuries.
NOTE Potential risk of damage to property or the environ-
ment.
Information on easier and safer working practices.
Other applicable
documents
ÄPlease also observe the following documents:
-Drawing of the sensor system (optional)
-Wiring diagram (optional)
-Installation instructions for the sensors used
Target group These instructions are intended for the operating company and for electrically
skilled persons. The electrically skilled person must be familiar with installation
and commissioning.
Validity These instructions are only valid for the products specified on the title page.
These instructions are part of the product.
Mayser accepts no responsibility or warranty claims for damage and consequen-
tial damage due to failure to observe the instructions.
About these instructions
Measurements used in
drawings
Unless otherwise stated, all measurements are in millimetres (mm).

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 5/23
Safety
Intended use
Safety
Safety instructions
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.
ÄIn the event of a fault, put out of operation
In the event of malfunctions and visible damage, put the control unit out of
operation by decommissioning it.
ÄPrevent the machine from restarting
Prevent the machine from restarting while a hazard exists, e.g. by using a
starting lockout.
ÄAvoid electric shocks
Before working on electrical systems, disconnect them from the power supply
and secure them to prevent them being switched back on to avoid electrical
injuries.
For your own safety, you must adhere to the following safety instructions.
ÄTake care when setting up the interface
Overall safety is aected by the quality and reliability of the interface between
the protection device and the machine. Take particular care when setting up
the interface.
The control unit is designed for processing the signals of a pressure-sensitive pro-
tection device (PSPD). It evaluates the output signals of sensors with monitoring
resistor 8k2 or 10k. The integrated output signal switching devices (OSSDs) trans-
mit the evaluated safety signals directly to the downstream control.
The product complies with ISO13849-1:2015 category3 PLd. To prevent any re-
duction in the safety classification, the downstream control must be of the same
category or higher.
The product has been developed taking EN 50155 into consideration and is suita-
ble for rail applications.

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 6/23
Safety
Terminals Y1, Y2 and Y3, Y4 are not voltage-free.
ÄContinue redundancy
Make sure you wire the unit directly in the control circuit or that two channels
continue to be used in the downstream control.
Residual dangers
There are no known residual dangers associated with this product.
ÄDo not interconnect control units
Do not combine control units by interconnecting them.
ÄFit spark absorbers
When connecting inductive loads, fit spark absorbers (RC circuits) to the con-
sumer.
ÄCheck supply voltage
Check the supply voltage. It must correspond to the connecting voltage US
specified on the type plate.
ÄObserve correct terminal assignment
Observe the correct terminal assignment when connecting the supply volt-
age.
ÄDo not overload control unit
Ensure that the specified switching current is not exceeded.
ÄEnsure sucient clearance
When installing the product in a switch cabinet, ensure sucient clearance
from heat sources (at least 2cm).
ÄObserve protection class
Only use the control unit in spaces with a minimum protection class of IP54
(e.g. a switch cabinet).
ÄDo not open the control unit
Never open, tamper with or alter the control unit.
To prevent irreparable damage to the product, you must observe the following
safety instructions.
ÄDo not exceed maximum number of sensors
Do not connect more than 5 sensors in series to the control unit.

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 7/23
Parts supplied
Terminals: Connections:
A1, A2 Supply voltage
Sensor input
Y1, Y2 Sensor 1
Y3, Y4 Sensor 2
Reset
S13, S15 Bridge for automatic reset
S14, S15 Bridge for automatic reset
S13, S14 Manual reset button
S14 Controlled reset input
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, immediately check the parts supplied to ensure they are com-
plete and in good condition.
Product overview
Connections
ÄStore control units in a dry place inside the original packaging.
ÄObserve the storage temperature in accordance with the technical data.
Storage

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 8/23
Function
•Green “P” (Power) LED:
supply voltage connected
•Yellow “S1” (Sensor 1) LED:
sensor 1 activated
•Yellow “S2” (Sensor 2) LED:
sensor 2 activated
•Red “F” (Fault) LED:
fault/error
The single-fault-safe electronics module has dual channels (redundant design).
Two monitoring 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 elec-
tronics monitor the electrical resistance of the connected sensors which have a
defined closed-circuit current.
If sensor1 is activated, then the OSSDs from monitoring circuit1 are in the OFF
state, signal outputM1 is HIGH. The yellow LED “S1” is lit up. If sensor2 is acti-
vated, then the OSSDs from monitoring circuit2 are in the OFF state, signal out-
putM2 is HIGH. The yellow LED “S2” is lit up. If sensor1 and sensor2 are activat-
ed, 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 operated with a voltage of 24 to 36VDC. When the supply
voltage is connected, the green “P” LED is lit up.
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 signal 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
ignored.
LEDs information
Function
If the control unit is being operated with only one sensor (mode: “monitoring
circuit2 inactive”), then it needs to be connected to terminalsY1 and Y2. Termi-
nalsY3 and Y4 for sensor2 remain unconfigured.
Ready for operation
Sensor activated
Terminology: ON state,
OFF state according to
ISO13856

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 9/23
Function
In the event of a cable break between sensor1 and the control unit, all OSSDs
from monitoring circuits1 and 2 are in the OFF state, signal outputsM1 and M2
are HIGH. The yellow “S1” LED and the red “F” LED are flashing.
In the event of a cable break between sensor2 and the control unit, all OSSDs
from monitoring circuits1 and 2 are in the OFF state, signal outputsM1 and M2
are HIGH. The yellow “S2” LED and the red “F” LED are flashing.
If a functioning sensor is connected again after a cable break, the device remains
in fault mode. The respective yellow “S1” or “S2“ LED and the red “F“ LED continue
flashing, the OSSDs of both monitoring circuits remain in OFF state and the signal
outputs at HIGH. A supply voltage interruption of at least 500ms will reset the
fault mode.
If a cable break is detected on monitoring circuit2 but is not rectified, it will no
longer be registered once the control unit has been restarted (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”.
If the defined signal pulse of the higher-level control is applied to terminal S14,
the OSSDs change from the OFF to the ON state again after a delaytw.
A HIGH signal at terminal S14 triggers a reset.
Conditions for the signal pulse of the higher-level control:
-Min. / max. pulse duration 70ms / 19s
-Min. / max. pulse voltage 10V / 24V
No reset will take place if the pulse duration is shorter than the minimum permit-
ted or if the pulse voltage is incorrect.
If the max. pulse duration is exceeded, the control unit changes to the “Fault / Sys-
tem error” mode (see Troubleshooting and remedies).
The control unit works with an automatic reset function. If the protective device
stops being activated, the OSSDs of the control unit automatically switch from the
OFF state to the ON state after a delaytw. Without an additional starting lockout,
the machine would start up again immediately.
The control unit works with a reset function. If the protective device stops being
activated, the OSSDs of the control unit remain in the OFF state. This prevents the
machine from restarting. Only a “Reset” command will change the state from OFF
to ON.
Sensor cable break
Automatic reset
Reset
Controlled reset

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 10/23
Function
Reset pulse
control
Reset
no
yes
Fault
no
yes
yes
no
ON
OFF
OSSD
If the reset button is pressed, the OSSDs return to the ON state again after a de-
laytw.
Reset pulse
button
Reset
No
Yes
Fault
No
Yes
Yes
No
ON
OFF
OSSD
The control unit monitors the reset button and detects a malfunction via the actu-
ation period. The conditions for this are:
-Min. / max. actuation period 70ms / 19s
If the actuation period is shorter than the minimum permitted, no reset will take
place.
If the max. actuation period is exceeded, the control unit changes to the “Fault /
System error” mode (see Troubleshooting and remedies).
The control unit works with a manual reset function. If the protective device stops
being activated, the OSSDs of the control unit remain in the OFF state. This pre-
vents the machine from restarting. Only a “Manual reset” command will change
the state from OFF to ON.
Manual reset

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 11/23
Installation
1. Fix the control unit in any position on a 35°mm mounting rail acc. to
IEC60715.
Installation
For your own safety, you must also adhere to the following rules during
installation:
•Disconnect from the power supply all devices and live parts that are located in
the immediate vicinity.
•Secure them to prevent them being switched back on.
•Check that they are de-energised.
Caution Impaired operation due to overheating
If the control unit overheats as a result of external heat, operation of the pro-
tective device may be impaired or it may fail completely.
ÄIt is absolutely essential to ensure sucient clearance from heat sources
(at least 2cm).

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 12/23
Installation
2. Wire the sensors, OSSDs and supply voltage to the cable terminals.
R1 = 8k2 or 10k
R2 = 8k2 or 10k
1 2
Monitoring
circuit 1
Monitoring
circuit 2
SensorSensor
Reset
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−0.7V is applied, depending
on the load and supply voltage.
The following applies to the outputs:
ÄWire the load between the output terminal and A2.
ÄPlace bridges between cable terminals S13 and
S15 and also between S14 and S15.
Automatic reset
Manual reset
Reset
Controlled reset
ÄWire the control output to cable terminal S14.
Terminals S13 and S15 remain unconfigured.
ÄWire up a button between cable terminals S13
and S14.
Terminal S15 remains unconfigured.
Automatic reset
Control
Manual reset

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 13/23
Installation
Signal outputs M1 (sensor 1) and M2 (sensor 2) are semiconductor outputs (PNP)
and short-circuit-proof. In the HIGH state, the voltage US−0.7V is applied, de-
pending on the load and supply voltage.
The following applies to the signal outputs:
ÄWire the load between the signal output terminal and A2.
Connection examples
Connection example 1
Connection example 2
Signal outputs
Monitoring
circuit 1
Monitoring
circuit 2
NOTE
In an electromagnetic extreme case (surge pulse) the signal outputs may flick-
er. This does not aect the safety function.
ÄProtect the control unit from excessive incoming electromagnetic radia-
tion.
Monitoring
circuit 1
Monitoring
circuit 2
Higher-level
control

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 14/23
Installation
• • •
Monitoring
circuit 1
Monitoring
circuit 2
Reset
Connection example 3
Connection example 4
Manual reset
Contact multiplication
Controlled reset
Monitoring
circuit 1
Monitoring
circuit 2
Reset
Higher-level
control

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 15/23
Commissioning
1. Make sure that everything is connected and no sensor is activated.
-Green “P” LED is lit
-OSSDs from monitoring circuit1 and monitoring circuit2 are in the ON
state
-Signal outputs M1 and M2 are set to LOW
2. Activate sensor 1.
-Yellow “S1” LED is lit up
-OSSDs from monitoring circuit1 are in the OFF state
-Signal output M1 is set to HIGH
3. Repeat step 1.
4. If connected, activate sensor 2.
-Yellow “S2” LED is lit up
-OSSDs from monitoring circuit2 are in the OFF state
-Signal output M2 is set to HIGH
5. Repeat step 1.
6. Disconnect sensor 1.
-Yellow “S1” LED and red “F” LED are flashing
-OSSDs from monitoring circuits 1 and 2 are in the OFF state
-Signal outputs M1 and M2 are set to HIGH
7. Repeat step 1.
8. Interrupt the power supply for at least 500 ms.
The control unit will restart.
Commissioning
1. Make sure the plug connections are firmly attached.
2. Connect the supply voltage.
Automatic reset
WARNING Danger of injury from electric shock
ÄNever unplug plug-in connectors while live.
Testing the function

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 16/23
Commissioning
9. If connected, disconnect sensor 2.
-Yellow “S2” LED and red “F” LED are flashing
-OSSDs from monitoring circuits 1 and 2 are in the OFF state
-Signal outputs M1 and M2 are set to HIGH
10. Repeat step 1.
11. Interrupt the power supply for at least 500 ms.
The control unit will restart.
1. Make sure that everything is connected and no sensor is activated.
-Green “P” LED plus “S1” and “S2” LEDs are lit up
-OSSDs from monitoring circuits 1 and 2 are in the OFF state
-Signal outputs M1 and M2 are set to HIGH
2. Initiate a reset signal via the higher-level control or press the manual reset
button.
-Green “P” LED is lit
-OSSDs from monitoring circuits 1 and 2 are in the ON state
-Signal outputs M1 and M2 are set to LOW
3. Activate sensor1.
-Yellow “S1” LED is lit up
-OSSDs from monitoring circuit1 are in the OFF state
-Signal output M1 is set to HIGH
4. Repeat steps1 and 2.
5. If connected, activate sensor2.
-Yellow “S2” LED is lit up
-OSSDs from monitoring circuit2 are in the OFF state
-Signal output M2 is set to HIGH
6. Repeat steps 1 and 2.
7. Disconnect sensor1.
-Yellow “S1” LED and red “F” LED are flashing
-OSSDs from monitoring circuits 1 and 2 are in the OFF state
-Signal outputs M1 and M2 are set to HIGH
Controlled reset and manual reset
Once the functional test has been successfully completed, the protective device is
ready for operation.
If the functional test could not be completed correctly, see Troubleshooting and
remedies.

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 17/23
Commissioning
8. Repeat step1.
9. Interrupt the power supply for at least 500 ms.
The control unit will restart.
10. Repeat step2.
11. If connected, disconnect sensor2.
-Yellow “S2” LED and red “F” LED are flashing
-OSSDs from monitoring circuits 1 and 2 are in the OFF state
-Signal outputs M1 and M2 are set to HIGH
12. Repeat step1.
13. Interrupt the power supply for at least 500 ms.
The control unit will restart.
14. Repeat step2.
Throughout the entire time the protective device remains activated, the OSSDs
stay in the OFF state.
If the protective device stops being activated, various states are possible for the
OSSDs. This depends on which reset type is selected (see Function, Reset).
Protective device activated
Once the functional test has been successfully completed, the protective device is
ready for operation.
If the functional test could not be completed correctly, see Troubleshooting and
remedies.

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 18/23
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 OFF LOW LOW No supply voltage
ON ON LOW LOW Control unit ready for operation
OFF ON HIGH LOW Sensor 1 activated
ON OFF LOW HIGH Sensor 2 activated
OFF OFF HIGH HIGH Fault on sensor 1 (cable break)
OFF OFF HIGH HIGH Fault on sensor 2 (cable break)
OFF OFF HIGH HIGH Fault or system error
OFF, ON
or
ON, OFF
OFF HIGH HIGH
Fault on 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
OFF, ON
or
ON, OFF
HIGH HIGH
Fault on monitoring circuit 2;
OSSD 2.1: OFF state and 2.2: ON
state or OSSD 2.1: ON state and
2.2: OFF state
Correlations
Recommissioning
Decommissioning
ÄCarry out the commissioning process (see Commissioning).
ÄDisconnect the protective device and secure it to prevent unintentional recon-
nection.
ÄAttach a clear notice to the protective device stating that it is temporarily or
permanently out of service.
1) Only applies if sensor 2 is connected.

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 19/23
Maintenance and cleaning
Fault indication Possible cause Remedy
Green “P” LED not light-
ing up
No or incorrect supply voltage 1. Check supply voltage, compare with
type plate
2. Check terminal assignment
If supply voltage is correctly connect-
ed: control unit is faulty
ÄReplace control unit
Yellow “S1” LED is lit up Sensor 1 is faulty 1. Measure resistance at sensor 1: target
value = 8k2 ±5% or 10k ±5%
2. Actual value ≠ target value: sensor is
faulty
3. Replace sensor
Control unit is faulty 1. Connect an 8k2 or 10k resistor to
terminals Y1, Y2
2. Fault not rectified: replace control unit
Yellow “S2” LED is lit up Sensor 2 is faulty 1. Measure resistance at sensor 2: target
value = 8k2 ±5% or 10k ±5%
2. Actual value ≠ target value: sensor is
faulty
3. Replace sensor
Control unit is faulty 1. Connect an 8k2 or 10k resistor to
terminals Y3, Y4
2. Fault not rectified: 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 functional test monthly.
Prerequisites:
•The sensor system has passed the latest test (see sensor installation instruc-
tions).
•The control unit is connected to the supply voltage and sensor.
•No sensor is activated.
Troubleshooting and remedies

121022 v1.02-RiA Operating instructions SG-RS 309-2 Page 20/23
Troubleshooting and remedies
Fault indication Possible cause Remedy
Yellow “S1” LED and red
“F” LED are flashing
Sensor not connected (or not connect-
ed correctly) to terminals Y1 and Y2
ÄConnect sensor
Sensor 1 cable break 1. Measure resistance at sensor 1: target
value = 8k2 ±5% or 10k ±5%
2. Actual value > 1M: sensor is faulty
3. Replace sensor
4. Disconnect power supply for at least
500ms
Yellow “S2” LED and red
“F” LED are flashing
Sensor not connected (or not connect-
ed correctly) to terminals Y3 and Y4
ÄConnect sensor
Sensor 2 cable break 1. Measure resistance at sensor 2: target
value = 8k2 ±1% or 10k ±1%
2. Actual value > 1M: sensor is faulty
3. Replace sensor
4. Disconnect power supply for at least
500ms
Green “P”, yellow “S1”
and/or yellow “S2” LEDs
are lit up
Automatic reset: bridges missing ÄPlace bridges between S13 and S15 as
well as between S14 and S15
Controlled reset: no reset signal from
higher-level control or pulse duration
is too short
ÄTrigger a signal pulse from the control
system (≥70ms)
Controlled reset: connection to control
interrupted
ÄCheck connection
Manual reset: reset button not
pressed or not held down long
enough
ÄPress reset button (≥70ms)
Manual reset: connection to reset but-
ton interrupted
ÄCheck connection
Control unit is faulty ÄReplace control unit
Green “P”, yellow “S1”
and yellow “S2” LEDs
are lit up, red “F” LED
flashes
Controlled or manual reset: duration
of signal pulse from higher-level
control is too long or reset button is
jammed
1. Check the duration of the signal pulse
(≤19s) from the higher-level control
or replace the reset button at S13 and
S14
2. Disconnect power supply for at least
500ms
Control unit is faulty ÄReplace control unit
Still unable to resolve the fault?
ÄContact Mayser-Support: Tel. [phone].
ÄIn the event of enquiries, have the information from the type plate to hand.
Type plate There is a type plate on the side of the control unit for identification purposes.