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4
4.1.1.2
Grounding the bus cabl e shield directly to the AC drive frame using an RC- filter
We r ecom mend you t o do the gr ounding in this manner when the distance between the devices ex-
ceeds 50 meter s (55 yds.). When the distance between the devices is l ong, distur bances (e.g. voltage
spikes) ar e mor e likely to appear . In this gr ounding method, the distur bances ar e filter ed out. Even if
the gr ound planes of A, B and C ar e differ ent (which is ver y typical e.g. in constr uction) ther e is no
cur r ent between them because the points do not have a gr ound connection.
NOTE:
If a pot ential differ ence occur s between the gr ounding point s, equal ization cur r ent can fl ow t hr ough a
shiel d connect ed at bot h ends. In this case, install an addit ional pot ent ial equal ization l ine and set this
jum per X1 in ON posit ion.
Figur e 4- 10. Gr ounding with RC filter
1
Set jumper settings depending on used har dwar e ver sion:
a) PC00257: Set jumper X1: Cable shiel d is connected to PE thr ough RC
X1
11688_00
Jumper X1
Cable shield is connected
directly to PE
Cable shield is connected to PE
through RC
Figur e 4- 11. PC00257 gr ounding jumper
b) PC01294: Set jumper X14
Upper r ow: GND connected to cabl e shield
Lower r ow: Cabl e shield is connected to PE thr ough RC
Profibus cable
Profibus cable
Profibus cable
A
B
C
