Operating & Mounting instructions – 8 074 143.03/03 – Page 67
Projecting
Special safety instructions
Short mains failure
During a mains failure, the >pDRIVE< CX profi frequency inverter continues operating until the
intermediate circuit voltage drops below the minimum working level (approx. 20 % below the lowest
supply voltage). The time depends on the mains voltage before switching off, and on the load.
If a Start command is issued, the motor runs up again as soon as the power supply returns. This can
be blocked with the function "USP". If a digital input is parametrised for the function 13 USP "Restart
lock" and this signal is also issued, an error message (E13) is issued whenever the mains supply is
switched on, if a Start command has already been issued. (See description of parameters C001 to
C005)
Automatic restart
y After low mains voltage:
If a Start command is issued, there is an automatic restart every time the mains supply returns.
y After confirming an error
y After autoreset (parameter b001)
Frequencies > 60 Hz
When operating motors with frequencies over 60 Hz, the suitability of the corresponding components
must be checked first. An inquiry with the motor or machine manufacturer is important. 4-8 pole
motors are usually suitable for operation up to 100 Hz.
Insulation tests
All >pDRIVE< CX frequency inverters are tested for voltage stability and insulating resistance in
accordance with EN 50178. Insulating resistance measurements, e.g. within the scope of an
inspection, must be carried out between the short-circuited power terminals and earth only. For a
correct, complete insulation test, the CE filters must be disconnected.
Do not carry out any insulation resistance tests with the control terminals !!
Installation rules for compliance with CE regulations
The >pDRIVE< CX profi frequency inverters together with the available filter options CE-DR comply
with the EMV directive 89/336/EEC and the low-voltage directive 73/23/EEC, i.e. conformity with
EN 61800-3 and EN 50178
• Use of the option "CE-DR Filter" or use of an equivalent filter solution
• Assembly on a properly grounded metal assembly plate with good HF connection between the
motor cable screen and filter.
• Use and proper connection (bipolar !!) of screened motor cables
• Use of an AMF (Output Motor Filter) for greater motor cable lengths
• Use and proper connection of screened control cables
• Grounding the frequency inverter with at least 10 mm
2
personal safety
• Separate installation of motor cables and other cables, especially control wires
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