ABB REG316 4 Series Operating Instructions Manual page 52

ABB Switzerland Ltd
However, when using FOX optical fibre equipment, the set-
ting is determined by the connection between the RE.316*4
and the FOX equipment.
The data transmission distance setting influences the output
power of the transmission diode. It must therefore be se-
lected such that the receiver diode at the remote end is not
overloaded.
To make sure that the setting is correct, measure the optical
signal strength while commissioning the system. The output
power must be in the respective range given in the following
table (MM = multi-mode optical cable 50/125 µm, SM = single
mode optical cable 9/125 µm):
OFC type
EA6.....S
MM -26 ... -20 dBm
SM -32 ... -22 dBm
Select the setting such that taking the attenuation to be ex-
pected due to the optical cable into account, the power at the
receiving end is between –34 dBm and –22 dBm. Measure
the signal strength at the receiving end to make sure that it is
within this range.
Note:
· Take care when measuring the output power to set
the level for the correct type of optical cable in use.
· One device must be configured as master (i.e.
'MstFox') and the other as slave.
· The same transmission distance, i.e. either 'EA62...S'
or 'EA6.....L', has to be configured at both ends.
· If an A/D converter Type 316EA62 or 316EA63 is
installed, the 'A/D' parameter must be set to 'EA6.....'
even if the optical fibre link is not in operation yet.
3-14
REG 316*4 1MRB520049-Uen / Rev. F
Setting
EA6.....L
-16 ... -13 dBm
-20 ... -17 dBm