Function - Lenord, Bauer GEL 3011 Betriebsanleitung

Lenord + Bauer
4

Function

The tower oscillation monitor measures the acceleration values on three axes (X, Y and
Z direction) and signals if the factory-set limits are exceeded in the X/Y direction (hor-
izontal plane) via a switched output (safety-related section). A trigger delay can be set
in the factory (as standard 50 ms). The current acceleration values determined for all
axes are output via a fieldbus interface (non-safety-related section).
The triggering behaviour corresponds to one of two possible criteria (pre-defined by the
factory):
– axis-related acceleration values
– geometric sum of the acceleration values
The following illustration clarifies this issue.
Axis-related
a
x1
a
a , a
x1 x2
a , a
y1 x2
a
r
Grey areas
The acceleration values are pre-filtered using up to two digital signal filters and factory-
set parameters to remove undesirable frequency components. If the acceleration ex-
ceeds the limit – combined with the opening of the safety circuit – the restoration of
normal operation is inhibited for a period of time also set in the factory (as standard
30 s), even if the acceleration then drops below the limit.
The architecture of the system is based on parallel redundancy with continuous moni-
toring.
GEL 3011
a
y
a
y1
a
x
0
a
x2
a
y2
Acceleration
Trigger values in negative and positive X direction
Trigger values in positive and negative Y direction
Trigger radius
No triggering
Geometric sum
a
y
OK
a
0
4 Function
a
x
a
r
a ≤ a
r
33