3.8.2 Safe generator operation
Take note of the following to ensure the safe operation of the machine with a generator:
➤ Check correct function of the insulation monitoring device daily.
➤ Do not earth the neutral line (N) or connect it to the common protective earth/equipotential
bonding (PE).
➤ Make sure the equipotential bonding to earth is properly carried through (mains and machine
through cable to consumer).
➤ If the generator feeds a network (TN network), let the network's protective measures remain
effective or create another protective measure that is effective.
➤ Adjust the protective measures accordingly if the generator feeds a different network.
➤ Only a qualified electrician is allowed to carry out work on the generator or generator control
box. The electrician is responsible for the effectiveness of the protective measures provided.
➤ Do not use the generator for feeding the construction current distribution.
➤ A generator with insulation monitoring must not be connected to another insulation monitoring
device as these monitoring devices can then have counter effects.
➤ Ground fault current (F1) protection switches do not function in unearthed networks (IT network
such as provided by the generator). The isolation provided by the generator, however, makes a
further ground fault current protection switch unnecessary.
➤ Follow the regulations of the local electricity supply utility and obtain any necessary permits.
➤ When cleaning the inside of the machine, do not direct water or steam jets directly at the gen‐
erator or terminal box.
➤ Check regularly that all electrical connections are tight and in proper condition.
3.8.3 Connecting extension cables
➤ When operating the generator, observe the regulations regarding the connection of extension
cables.
Bear in mind:
■ In IT networks, the total length of power cables may not exceed 250 m ((DIN VDE 0100, Part
728 / IEC 60364-5-551).
■ Use at least H07RN-F cables to DIN VDE 0282 Part 4 (IEC 60245-4 / HD 22.4) as non-fixed
extension cables.
3.8.4 Do not exceed the maximum supply system load
➤ When operating the generator, do not exceed the maximum supply system load due to con‐
nected consumers.
Bear in mind:
■ The power consumption values of simultaneous consumers are added.
■ The maximum continuous power loading on the generator by the connected consumers is limi‐
ted by the safety cut-out.
3.8.5 Perform regular generator inspections
To ensure a safe operation, the machine must be subjected to regular inspections.
Daily inspection prior to activating the device by authorised operating personnel:
➤ Insulation monitor function check.
3
Safety and Responsibility
3.8
Generator operation
36
Operating Manual Portable Rotary Screw Compressor
MOBILAIR M27 PE
No.: 9_9548 22 HCE
