Designated Use; Safety Requirements On The Customer System - Lenord, Bauer GEL 3011 Betriebsanleitung

Lenord + Bauer
2.2

Designated use

The tower oscillation monitor GEL 3011is used to monitor oscillations and vibration on
installations and machines. It measures acceleration values in X, Y and Z direction. If
a fixed limit range in the X/Y direction (horizontal plane) is exceeded, a relay output is
switched and a corresponding message output via the fieldbus.
The primary application area is wind turbines for monitoring the oscillations that occur
on the tower. However, the device can also be used in other sectors of industry with
comparable tasks as a so-called oscillation monitor. The operating altitude is limited to
4000 m.
The tower oscillation monitor is designed as a safety component as part of a safety
circuit in SIL systems and has the Performance Level PLd as per EN ISO 13849.
2.3

Safety requirements on the customer system

The higher level control, regulation and safety system must meet a number of require-
ments so that the specified function can be ensured. These are:
1. Ambient and operating conditions
The device must be transported, stored, installed and operated within the ambient
and operating conditions defined in the Technical Data
2. Regular self-test
At least once in an interval of 12 months, the higher level (safety) control system
must trigger the device self-test via the fieldbus or by interrupting the supply of
power for at least 10 seconds. In this way it is also possible to detect relay faults
that would not be apparent in normal operation.
3. Re-start protection
If previously defined limits are exceeded or a fault is detected, the safety circuit is
opened by the device. Provided the limits are not exceeded again during the inhibit
time (customer-specific) or the fault state has been left, the safety circuit is auto-
matically closed again by the device.
It is the task of the higher level control system to ensure the plant is not started
again in such a case without prior diagnostics on the cause of the triggering. (For
example this feature can be realised using an RS flipflop.)
4. Operating parameters
Depending on the type of installation, various operating parameters have been set
in the factory: limits, filters, trigger characteristic, mounting position, mounting ori-
entation. As the manufacturer is not familiar with the physical model, the control
parameters or the safety concept for the related type of installation, it is the respon-
sibility of the customer to determine the operating parameters such that safe oper-
ation of the installation and reliable shutdown in undesirable operating states is
ensured.
GEL 3011
Designated use
2 Safety
(→ page 41).
29