Instruction Manual PMC-2
BA * PMC-2 * EN * 01/98 Page 23
CAUTION
The PMC-2 leads increased leakage current and may be operated only
with connected earth conductor.
The leakage current exceeds 3.5 mA. Therefore appliances require a fixed
mains connection (according to draft DIN EN 50178/ed. 11.94, section 5.2.11).
3.7 Protection of dangerous movements
There may be various causes of dangerous movements:
• wiring mistakes
• software errors
• faulty components
• faults in measuring value and signal encoders
• mistakes in operation
CAUTION
Hazardous movements!
Risk of life hazard, serious injuries or material damage!
• Controls at the driving components to a large extent rule out malfunction in the connected drives.
For personal protection, one must not rely on these controls alone. Until these built-in controls
become effective, one must expect a faulty drive movement the extent of which depends on the
kind of malfunction and the operating mode. Therefore personal protection must be ensured by
monitoring or superior measures. These are planned by the engineer after a risk and error analysis
according to the specific situation of a plant. The respective safety regulations valid for the plant
are taken into consideration.
• No person is allowed within the moving range of the machine. This must be ensured e.g. by means
of protective fences, grids, covers or photoelectric barriers.
• Sufficient stability of fences and covers to resist maximum possible motive energy.
• The emergency stop switch must be easily accessible and located close to the operators. The
functioning of the emergency stop switch must be tested before initial operation.
• Secure against unintentional machine start by enabling the drives’ mains connection via
emergency stop circuit or use a secure start-up block.
• Before accessing the danger area, bring drives to a standstill.
• Before working at the plant, switch the electrical equipment current-free by main switch and secure
against switch-on.
• Avoid operating high-frequency, remote-control and radio devices in the vicinity of the plant
electronics and connecting wires. If the use of these devices is inevitable, check system and plant
for possible malfunctions in all working situations before initial operation. A special
electromagnetic tolerance check for the whole plant may be necessary.
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