188 HEIDENHAIN Technical Manual MANUALplus 620
X7: Bridge for
signal ground
(= functional
ground)
In shipping condition of the CC 61xx, the signal ground (pin 1) is connected to
the housing (pin 2) over an external bridge. If only one CC 61xx is in the sys-
tem, it ensures the correct signal-ground connection of the CC.
If there are two or more CC 61xx units in the system that are connected over
a UV power module to the same supply bus (X69), this external signal-ground
bridge can stay connected with only one CC 61xx. Disengage these bridges
on all other CCs in order to prevent ground loops.
If there are two or more CC 61xx units powered over more than one UV power
module and are therefore connected with different supply bus systems (X69),
then the external signal-ground bridge is to be connected with only one
CC 61xx of the respective supply bus. In order to prevent ground loops, disen-
gage this bridge for the signal ground on all other CC 61xx units that are on a
common supply bus (X69).
Connecting terminal
X7
Assignment
1 Connection for signal ground (= functional ground)
2 Connection on housing
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