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QM8 HANDBOOK
Module
Slots
Number
Code
of
Outputs
LL
7
2
LN
7
2
LQ
7
2
MB
8
2
MD
8
2
MG
8
2
MJ
8
2
ML
8
2
MN
8
2
MQ
8
2
MS
8
2
Cooling for unit
Component temperatures, for customer air cooled models, must be monitored in the end use application as
described in the "Cooling for Unit Temperature Table" below.
The following method must be used for determining the safe operation of PSUs.
The components listed in the following table must not exceed the temperatures given. To determine the
component temperatures the heating tests must be conducted in accordance with the requirements of the
standard in question. Consideration should also be given to the requirements of other safety standards.
Test requirements include: PSU to be fitted in its end-use equipment and operated under the most adverse
conditions permitted in the end-use equipment handbook/specification and which will result in the highest
temperatures in the PSU. To determine the most adverse conditions consideration should be given to the end
use equipment maximum operating ambient, the PSU loading and input voltage, ventilation, end use
equipment orientation, the position of doors & covers, etc. Temperatures should be monitored using type K
fine wire thermocouples (secured with cyanoacrylate adhesive or similar) placed on the hottest part of the
component (out of any direct airflow) and the equipment should be run until all temperatures have stabilised.
Module
ES1 (<42.4Vpk,
Description
60Vdc)
(Module nominal
voltage used)
Modules
connected in
-
series, split after
9th output
Modules
connected in
-
series, split after
11th output
Modules
connected in
-
series, split after
13th output
Modules
connected in
-
series, split after
1st output
Modules
connected in
-
series, split after
3rd output
Modules
connected in
-
series, split after
5th output
Modules
connected in
-
series, split after
7th output
Modules
connected in
-
series, split after
9th output
Modules
connected in
-
series, split after
11th output
Modules
connected in
-
series, split after
13th output
Modules
connected in
-
series, split after
15th output
ES2 (Anything above
ES1 but below
70.7Vpk, 120Vdc)
(Module nominal
voltage used)
-
-
-
-
-
-
-
-
-
-
-
Page 28 of 40
ES3 (anything above ES2)
(Module nominal voltage used)
All LL modules are ES3
All LN modules are ES3
All LQ modules are ES3
All MB modules are ES3
All MD modules are ES3
All MG modules are ES3
All MJ modules are ES3
All ML modules are ES3
All MN modules are ES3
All MQ modules are ES3
All MS modules are ES3
260401-05 July 2019
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