C-2

FACTORY MUTUAL (FM)

TheFM entity parameters listed in Table1 only apply to associated

apparatuswith linear output.

.

Before connecting the model 275 into the loop, determine the connected

inductanceof the system by adding the Liof the transmitter and cable.
The sum must be less than the La, as determined from Table2, before the

275can be connected into the loop.

If the connected inductance is greater than the value determined from the

table,a barrier with a lower Isc must be chosen.
Table1: FM Entity Parameters
InputParameters ClassI,Div.1,GroupsA,B,C,D
Vmax=30Vdc VTorVocof barrier must be < 30 Vdc
Imax=300mAITorIsc of barrier must be < 300 mA
Ci=0.07µFCAofbarrier must be > 0.07 µF
Li=0mHLAofbarrier must be > 0mH
OutputParameters
Voc=1.7Vdc N/A
Isc=32mAN/A
Table2: Maximum Allowable Connected In ductance
ImLa(mH)
(mA) Groups
A&B
Group
C
Group
D
300 0.20 1.80 3.20
280 0.21 2.00 3.70
270 0.23 2.20 3.90
260 0.25 2.50 4.30
250 0.27 2.70 4.60
240 0.30 3.00 5.00
220 0.40 3.20 5.90
200 0.50 4.00 7.20
180 0.60 5.00 8.80
00275-0081
DWGNo.
Rev.D. Sheet1 of 2