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QM7 and QS7 Instruction Manual
60950-1: Series modules
For SB, SC and DM modules, all outputs are SELV except under the following circumstance: Outputs
connected in series are non-SELV if, using the formula below, V
V
= (n-1) × V
Total
outmax
Where n is the number of seriesed outputs
Where X is taken from the table below
Where V
is taken from the table below
outmax
SC modules
Voutmax
5
5.5
12
13.2
24
26.4
36
39.6
48
52.8
SB modules
Voutmax
3.3
3.63
5
5.5
12
13.2
15
16.5
18
19.8
24
26.4
28
30.8
48
52.8
DM modules
Voutmax
12
16.1
24
28.8
For DH modules, all outputs are SELV except under the following circumstance: Outputs connected in series
are non-SELV if, using the formula below, V
V
= (2× V
×1.3) + (n-2) × V
Total
outmax
Where n is the number of outputs connected in series
DH modules
Voutmax
12
13.8
15
17.25
24
27.6
27
31
If the total voltage of outputs connected in series exceeds the 60Vdc SELV limit then all outputs must be
considered non-SELV.
Non-SELV outputs are hazardous and must not be made user accessible. Consideration must be given to
service engineers making inadvertent contact with the output terminals in the end equipment.
+X
OVP (%
)
X
V
outnom
140
7
140
16.8
130
31.2
140
50.4
125
60
OVP
(% V
)
X
outnom
140
4.62
140
7
140
16.8
140
21
140
25.2
130
31.2
140
39.2
125
60
OVP
(% V
)
X
outnom
135
21.7
135
38.8
is found to be >60Vdc
Total
outmax
OVP (%
V
outnom
130
130
130
130
is found to be >60Vdc
Total
)
Page 24 of 40
260297-10, Nov 2021
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