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Moog DS2000 User Manual

Moog DS2000
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SECTION EIGHT – Safety function RESTART INTERLOCK (Optional)
DS2000 USER’S MANUAL (rev.C)
8.2
8.2 RESTART INTERLOCK FUNCTION
The restart interlock safety function by Moog has been validated compliant with the
provisions of category 3 as defined in the harmonized standard EN-954-1:1996 by
demonstrating that:
a single fault does not lead to the loss of the safety function
some, but not all, possible faults can be detected
the accumulation of undetected faults can lead to the loss of the safety function
The remaining risk is in this case when two errors/faults occur simultaneously in the power
section; the motor briefly rotates through a small angle (6-pole motor 60°, 8-pole motor 45°,
12-pole motor 30°, 16-pole motor 22.5°).
The drive controls the movements of an AC three-phase motor via the generation of a
rotating magnetic field. To do this, the microprocessor generates a complex model of pulses,
which are amplified and used to drive the power semiconductors.
The Restart Interlock function operates via hardware, with a relay with forcibly guided
contacts which interrupts the auxiliary power supply to the IGBT drivers, and via software by
blocking the generation of PWM pulses.
As a result of a risk analysis and evaluation which must be carried out according to the
Machinery Directive 98/37/EC modified and referring to standards EN ISO 12100-1, EN ISO
12100-2, EN 954-1 (EN ISO 13849-1) and EN 1050 and, if it exists, the product standard
(e.g. EN 775, safety requirements for robots), the machinery manufacturer must configure the
safety circuit for the complete machine taking into account alI of the integrated components
of the safety chain, including the electric drives.
The principle to achieve category 3 safety is mainly characterized by structure, which is
strictly connected to the consequences of the loss of the safety function and to the risk of a
specific application.
The greater the reduction of risk is dependent on the circuit parts, then the performance level
of these parts is required to be higher.
To improve the reliability level of the safety function of the drive (one hardware channel and
one software channel) or to discriminate the intervention of different protection systems on
the machine by checking the NC contacts, on the RIC board there are two relays with forcibly
guided contacts approved by TUV according to EN 50205, and both are able to interrupt the
auxiliary power supply to the IGBT drivers.
For example, the product standard EN201/A2:2005 related to injection moulding machines
with electrical axes, specifies for the axis for the horizontal movement of the platen (fig.G3)
the use of both the relays in order to have two independent hardware channels in addition to
the standard SW channel.
Moreover the architecture of all the circuit parts (external to the drive) which are involved in
the safety function must be compliant with category 3 of EN 954-1 (EN ISO 13849-1).

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Moog DS2000 Specifications

General IconGeneral
BrandMoog
ModelDS2000
CategoryDC Drives
LanguageEnglish

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