Operating & Mounting instructions – 8 074 143.03/03 – Page 97
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Remarks
• The switching frequencies of >pDRIVE< CX must be set to a value of 3 kHz or less in
accordance to the table “allowed cable length”
• Because of the higher earth capacitances, parallel motor cables
should only be used for short
distances (see table “allowed cable length”)
• The kind of laying the cable
influences the losses of the choke. The table refers to laying
the cable into a cable location line. Laying under ground or in water increases the leakage
current. The switching frequency has to be reduced furthermore.
• It is not allowed to operate the frequency inverter without an effective connection to earth
. The
connection has to be in accordance to the local regulations for high leakage current (> 3,5 mA).
• It is not allowed to operate the frequency inverter with a standard earth-leakage breaker
, if the
local regulations don´t permit this because of a possible D.C. amount in the leakage current.
Overtemperature protection
1.) Set the switching frequency
in accordance to the table.
Low switching frequencies mean less losses of the choke and reduce the leakage current.
Set parameter b083 to 3 kHz or less.
2.) Integrate the thermoclixon
of the choke for switchoffs in case of overtemperature
e.g. use of terminal 3 as external trip
Parameter C013 = 01 (Inversion of Te. 3)
Parameter C003 = 12 (=EXT, "external trip")
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