Installation
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300407956_002_C1 - 01/2017 - © Leybold
Fig. 3.9 Establishing the potential equalisation at the pump casing
Washer
Lock washer
Hexagon socket screw M 10
Copper strap, for example
In the case of FC operation considerable electromagnetic interference occurs.
Here the limits specified in the pertinent standards and guidelines need to be
complied with under all circumstances by the installer. In order to reduce the
level of electromagnetic interference, shielded motor cables, shielded cable
feedthroughs, mains filters and EMC compliant ground connections are
required between frequency converter and pump.
In order to protect the pump, current limits in the frequency converter as a
function of the frequency must be taken into account.
Permissible frequencies range
The permissible frequencies range for LEYVAC pumps is between 20 Hz
to max. 70 Hz, except for the LV 250 it is between 20 Hz and 60 Hz.
Establishing Potential Equalisation
In the case of operation with a frequency converter and ground leakage-
currents of over 3.5 mA, the protective ground conductor must have
across-section of the least 10 mm
2
. Or a further protective ground conduc-
tor having at least the same cross-section as the connection cable must
be provided.
A M10 thread is provided at the motor casing for connecting the external
potential equalisation cable.
The potential equalisation conductor must be connected as depicted
in Fig. 3.9.
After connecting the motor and every time you alter the wiring, check the
direction of rotation (cf. Section 3.6.3 for more information)
.
NOTICE
