3. Architecture, configuration and applications
3.1. Architecture (gearbox sizing)
For gearbox architecture (gearbox sizing) the maximum torques, run torques,
reduction ratios and operating times are taken into consideration.
Incorrect gearbox architecture can lead to device damage within the safety-
related system!
Possible consequences: e.g. Damage at valve, gearbox or actuator.
→The gearbox technical data must imperatively be observed when selecting the
gearbox.
→Sufficient reserves have to be provided to ensure that gearboxes are capable
of reliably opening or closing the valve even in the event of an accident.
Information Gearboxes of GS type range may only be used in duty class 1. Extension flanges
may not be used. Only gearboxes with splash lubrication using greases F02, F13 or
F15 may be used.
3.2. Configuration (setting)
For GS type range, the end stop setting (if available) is performed in compliance
with the operation instructions.
3.3. Protection against uncontrolled operation (self-locking/brake)
For self-locking AUMA gearboxes, it can be assumed that a load up to maximum
torque will not result in uncontrolled operation from valve standstill due to valve torque
load.Consequently, in these cases, further protection against uncontrolled operation
is not imperatively required.However, certain applications may require active position
locking, for example by using a brake. Furthermore, you should bear in mind that
conditions may be different if a standstill is also to be achieved from the movement
of the valve.There are user-specific standards demanding a brake.Therefore, each
project must be subject to individual verification if any further protection is required.
In any case, this protection is required for gearboxes without self-locking.
Information Under normal operation conditions, gearboxes of GS type range are self-locking at
standstill. Gearboxes of the GK type range are NOT self-locking.
3.4. Operation mode (low/high demand mode)
The safety functions of the gearboxes supplied by AUMA are suitable for the low
demand mode and may only be used in this operation mode.If a non-safety
instrumented function of the basic process control system is executed in addition to
the safety functions via the same gearbox, note that while considering the sum of
operational function, required tests and safety function, the maximum permissible
lifetime and cycle time within a safety instrumented system specified for gearboxes
may not be exceeded.
3.5. Further notes and indications on architecture
HFT is 0.This is a type A component.
Safety figures
Safety figures vary depending on the gearbox type.The safety figures relevant for
the product supplied as well as any potential further restrictions must be indicated
on the declaration of incorporation.The declaration of incorporation is specific for
each order and directly supplied with the order.
3.6. Applications (environmental conditions)
Whenspecifying and using thegearboxes within safetyinstrumented systems, make
sure that the permissible service conditions are met.Service conditions are indicated
in the technical data sheet.
6
Gearboxes
Architecture, configuration and applications
