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When operating frequency inverters, please also note that the site power
distributor or the supply line is equipped with an all-current intensive residual
current circuit breaker.
When using frequency inverters, DC residual currents with low residual
ripple occur in the event of a fault. The pulse current-intensive residual
current (RCD) circuit breakers that have proven themselves in industry
cannot switch this type of residual current safely. For this reason, all-
current-intensive residual-current circuit breakers must be used when
operating with frequency inverters.
12.1.5 Notes on the delivery hoses
Observe the following points for the delivery hoses and their routing:
− Only use approved delivery hoses and hose couplings with a minimum
diameter of 50 mm, an operating pressure of 10 bar and a burst
pressure of 40 bar.
− To prevent blockages, do not use delivery hoses with different nominal
diameters.
− When setting up the machine and when laying the cables, make sure
that no employees or persons outside the company are hindered or
endangered. In individual cases, appropriate warning signs may have to
be put up.
− The delivery hoses and hose couplings are subject to natural wear due
to abrasion and ageing. Check the delivery hoses and hose couplings
for perfect condition. Check the delivery hoses, the couplings on the
hoses, the connection couplings on the mixing and delivery vessel or
the pump.
➢ The inspection must be carried out by a specialist (safety control
sheet) at least every 3 months.
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