Appendix
5.2.2
Important terms
Term
Meaning
Safe
Safe
in conjunction with drive functions (e.g.
safe stop
,
safe standstill
) means that in case of an error, the behaviour of the control
elements will be subject to a control category according to EN 954-1 pertinent to the risk analysis in accordance with EN 1050. In some
cases, the categories to be applied are specified in machine-specific standards (C-standards).
Standstill
Standstill
is the state, in which the mechanical component is at a standstill. The drive is no longer supplied with energy.
Safe standstill
1), 2)
At a
safe standstill,
the power supply to the controller is safely interrupted according to EN 1037, section 4.1. The controller need not
be able to generate a torque and thus dangerous rotations (see EN 1037, section 5.3.1.3). The standstill position must not be
monitored. A contactor can be used to disconnect the power supply.
If at
a safe standstill
an external force is likely to act, e.g. stalling of hanging loads, additional measures have to be provided that
safely prevent these movements (e.g. mechanical brakes). The following measures can be taken to ensure a
safe standstill
:
•
Contactor between mains and drive system = mains contactor
•
Contactor between power unit and motor = motor contactor
•
Safe blocking of the pulses of the power semi-conductors = safe pulse inhibitor
Controller enable
(ctrl. enable)
Internal controller function, e.g. for the pulse blocking of the the final power stages
Controller enable = Controller inhibit
If controller inhibit is active the power stages are inhibited. All controllers are reset.
•
Controller enable can be controlled from 6 inputs.
•
Terminal X5/28 (LOW = controller inhibit)
•
Control word CAN-CTRL, bit 9 of CAN-IN1
•
Control word AIF-CTRL, bit 9 of AIF-IN
•
Control word C0135, bit 9
•
Free inputs: DCTRL-CINH1, DCTRL-CINH2
•
All inputs are OR linked.
•
C0136/1 displays the control word C013. 5
Quick Stop (QSP)
Internal drive controller function for the operational stop
Quick Stop
The drive is braked to standstill via the deceleration ramp C105 and generates a holding torque.
•
Quick Stop can be controlled from 3 inputs.
•
Control word CAN-CTRL, bit 3 of CAN-IN1
•
Control word AIF-CTRL, bit 3 of AIF-IN
•
Control word C0135, bit 3
•
All inputs are OR linked.
•
C0136/1 displays the control word C013. 5
1)
According to the national and the European preface to EN 60204-1, electronic equipment for emergency off installations may be used, if it
corresponds to the standards EN 954-1 and /or IEC 61508. If this is the case, the function “Safe standstill” can be used for emergency off
functions, provided that EN 954-1 and IEC 61508 are applied.
2)
According to EN 60204-1, section 5.3, machines have to be additionally equipped with a mains switch.
5.3
Important standards and categories
5.3.1
Applied standards
Directive / standard Title
RL 98/37/EG
Directive 98/37/EG of the European Parliament and of the Council of 22 June 1998 on the approximation of the laws of
the member states relating to machinery
EN 292-1/2
Safety of machinery. Basic concepts, general principles for design; part 1: Basic terminology, methodology; part 2:
Technical principles and specifications
EN 418
Emergency stop equipment, functional aspects. Principles of design
EN 954-1
Safety of machinery; safety-related parts of control systems; part 1: General principles for design
EN 1050
Safety of machinery. Principles for risk assessment
EN 1070
Safety of machinery. Terminology
EN 60204-1
Safety of machinery. Electrical equipment of industrial machines. Part 1: Specification for general requirements
EN 1037
Safety of machinery. Prevention of unexpected start-up
Draft IEC 22G/52/CD
Adjustable speed electrical power drive systems; part 5: Electrical, thermal and functional safety requirements,
electrically adjustable speed power drive systems
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