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Tower Oszillation Monitor GEL 3010



  • 2-axis tower oscillation monitor in compact design
  • Integrated safety relay switches on reaching the adjustable limits
  • Maintenance and wear-free operation due to MEMS acceleration sensors
  • Measuring system is not subject to ageing, is insensitive to temperature fluctuations, dirt or condensation
  • Redundant system possible due to usage of 2 tower oscillation monitors


  • Measuring direction X and Y
  • Resolution 0.01 m/s2
  • Extended temperature range -40 ºC to +85 ºC
  • Interfaces:
    - EtherCAT,
    - CANopen
    - Adjustable safety relay output
  • Protection class IP 67
  • Installation altitude 4000 m


  • Suitable for all standard applications and also for real heavy-duty applications
  • Temperature behaviour stable over the long-term
  • Full function in case of condensation: dew-point resistant!

Field of application

  • Wind power


Construction and design

The tower oscillation monitor GEL 3010 is designed for monitoring oscillations and vibration on machines and installations "in accordance with DIN ISO 10816".
MEMS acceleration sensors, safety relay and EtherCAT or CANopen interface are integrated into a compact housing made of anodised aluminium. The state of the vibration monitor can be checked on-site using 6 diagnostics LEDs. The tower oscillation monitor contains a positively driven switched output that can be integrated into an existing safety chain. A redundant system can be realised by using two tower oscillation monitors.
The GEL 3010 is suitable for standard and heavy-duty applications, it also withstands aggressive media and impresses with a long, maintenance-free service life. It can be used in an expanded temperature range from -40 ºC to +85 ºC.


The tower oscillation monitor is available with an EtherCAT interface or a CANopen interface.
The switched output is a positively driven, floating safety relay with one normally closed contact and one normally open contact. In the de-energised state and in case of an error, the relay is open. The switching points (trigger limits) and the trigger delay are adjustable.

Sensing principle

The tower oscillation monitor GEL 3010 measures the accelerations in the X and Y direction using so-called MEMS acceleration sensors, micro-electro-mechanical systems that operate like spring-mass systems.
In principle a freely moving mass is suspended in the MEMS module; this mass is held in the middle position between two reference electrodes by springs. The mass forms the moving electrode of two capacitors.
The moving mass is accelerated by oscillations and vibration. It moves and the distance between the middle electrode and the reference electrodes changes, as a consequence the electrical capacitance of the capacitors also changes. The electronics measure this change in the capacitance and compare the values measured with the limits set. If the acceleration reduces, the springs return the moving mass to its original position. If the acceleration is zero, the installation has reached the required speed or it is not in operation, as a result the spring-mass system is at rest.
The GEL 3010 contains two acceleration sensors that measure the movement in both the X and Y direction. This configuration makes it possible to test the sensors internally during the self-test.

Safety function


After power up the GEL 3010 checks the internal acceleration sensors and the relay during the self-test. Once the device is ready for operation, the status is sent to the installation control system via the bus interface.
The continuous self-test function in the GEL 3010 ensures both acceleration sensors are tested during operation. A defective sensor is reliably detected and the device signals the failure of the sensor via the field bus.
During operation a self-test can be triggered by the installation control system using the field bus protocol. For this purpose the relay is switched once, as a result the safety circuit is opened.
To ensure an interruption-free safety circuit even during the self-test, two tower oscillation monitors should be connected in parallel. In this case the self-test triggered via the field bus must not be initiated on both devices simultaneously.

Safety chain

The GEL 3010 can be permanently wired in series with other monitoring devices in the safety chain. If a monitoring device triggers, the safety chain is interrupted and, if necessary, emergency braking initiated.
On reaching the limit set, the safety relay in the tower oscillation monitor can be switched and the safety chain opened. In parallel the critical state is signalled to the installation control system via the field bus. In this way dangerous, superimposed resonances are reliably detected and the installation shut down.
By using several tower oscillation monitors in the safety chain, different safety concepts can be realised:
Onshore  Usage of two devices provides redundancy by                   means of cross-comparison
Offshore  Usage of three devices ensures safe operation                   even in case of the failure of a device

Technical data

Measuring axes 2 (X, Y direction)
Measuring range ± 20 m/s2 (2g)
Resolution ± 0.01 m/s2
Accuracy ± 0.05 m/s2 typical
Zero point offset(1) ± 0.5 10-3 m/s2K
Cross-sensitivity ≤ 2 %
Electrical data
Operating voltage 15 to 36 V DC
Power consumption
< 2.4 W
< 3.5 W
Scanning rate 5 ms
Digital interfaces CANopen, EtherCAT
Switched output
Relay 1 x NC, 1 x NO,
positively driven, floating,
Position in the de-energised state: open
Position in case of error: open
Relay nominal values 24 V DC / 0,5 A
Relay minimum current ≥ 5 mA at 24 V DC
Trigger limit X direction ± 2 m/s2 (0.2g)
Trigger limit Y direction ± 2 m/s2 (0.2g)
Trigger delay 0.05 s
Inhibit time after relay triggering 30 s
Cut-off frequency low-pass filter 10 Hz
Mechanical data
Housing material Anodised aluminium
Weight 625 g
Dimensions (WxDxH) 156 x 76 x 46 mm
Environmental conditions
Assured operating temperature range -40 ºC to + 85 ºC
Storage temperature range -50 ºC to + 85 ºC
Installation altitude 4000 m
Protection class in accordance with DIN 60529 IP 67
Vibration resistance (DIN EN 60068-2-6) 200 m/s2, 10 ... 2000 Hz
Shock resistance (DIN EN 60068-2-27) 1000 m/s2, 11 ms
EMC EN 61000-6-1 to 4
Insulation strength Ri > 1 MΏ, at a test voltage of 500 V AC
Max. relative humidity of air 99 %
Condensation permitted yes

Overview of connections and status monitoring,
Switching variants

Overview of connections and status monitoring
Identifier Function LED status indication
X1 RELAY Relay off Triggered (SC open)
green Ready (SC closed)
flashing red Error
X2 POWER Power
red 24 V power supply in order
orange Internal device power supply in order
DIAG Device status green brighter/dimmer Ready (SC closed)
green flashing Bus communication interference (SC opened)
flashing red Error
red/green flashing Relay has triggered, switching back on not yet allowed
(SC opened)
X3 IN Bus input green/red Function dependent on the interface
X4 OUT Bus output green/red Function dependent on the interface
STATUS Bus status green/red Function dependent on the interface
Switching variants within the safety chain

Pin layout,
Technical data — interfaces

Pin layout
Pin layout — interfaces
Technical data — interfaces
Interface EtherCAT CANopen
Device profile CoE (CANopen over EtherCAT) DS 401 CANopen DS 401
Connection D-coded M12 connection and diagnostics
A-coded M12 connection and diagnostics
Parameter Limits in X and Y direction, trigger delay, relay
inhibit time, cut-off frequency (low-pass filter)
Limits in X and Y direction, trigger delay,
relay inhibit time, cut-off frequency (lowpass
Sensor ID Automatic address assignment LSS in accordance with DS 302
Operating temperature -40 ... +85 ºC -40 ... +85 ºC

Dimensional drawing

Dimensional drawing GEL 3010

Type code,

Type code GEL 3010

Customer-specific designs

Customer-specific modifications to mechanical and electrical features are in principle possible.


Description Item number
CANopen connection cable 10 m, 5-pin plug / flying lead with ferrules BK 2100
CANopen connection cable 2 m, 5-pin plug / flying lead with ferrules BK 2101
CANopen connection cable 10 m, 5-pin socket / flying lead with ferrules BK 2102
CANopen connection cable 2 m, 5-pin socket / flying lead with ferrules BK 2103
CANopen connecting cable 10 m, 5-pin socket/plug BK 2104
CANopen connecting cable 2 m, 5-pin socket/plug BK 2105
CANopen, mating connector 5-pin socket, A-coded FS 3020
CANopen, mating connector 5-pin plug, A-coded FS 3021
CANopen terminating resistor M12 FS 3040
Power supply connection cable 10 m, 4-pin A-coded socket/ flying lead with ferrules FS 3019
Power supply connection cable 2 m, 4-pin A-coded socket / flying lead with ferrules FS 3018
EtherCAT, mating connector, M12, 4-pin plug, D-coded FS 3039
Relay output connection cable 10 m, 4-pin socket D-coded / flying lead with ferrules FS 3075
Relay output connection cable 2 m, 4-pin socket D-coded / flying lead with ferrules FS 3074
Relay output mating connector, M12, 4-pin socket, D-coded Upon request