CDM Commissioning Guidance T1689 Technical Manual Rev 07
Visual Inspection MV3000 Air Cooled DELTA
Page 130
6.2 VISUAL INSPECTION
The pre-commissioning visual checks now outlined apply to DELTA equipment housed in an enclosure and
where appropriate, to DELTA modules supplied loose. The checks outlined include those for the cooling system
within the enclosure. Check that:
• If multiple modules are required, ensure they are of the same type and voltage grade;
• Check that the Timed Overvoltage links (if fitted) on the DELTA 1 SMPS module are correct;
• The modules have been correctly assembled in the appropriate mounting frames in accordance
with the instructions in Section 5; CDM Assembly.
• There is adequate clearance around the control components within the enclosure for ventilation;
• There is adequate clearance around the enclosure for ventilation, and that the ventilation louvres
are not covered or blocked;
6.3 ELECTRICAL SAFETY TESTS
6.3.1 Introduction
When the visual inspection has been completed, it is recommended that earth continuity and insulation tests
be carried out, prior to the equipment being commissioned. This is to check that cables have not been
damaged during installation and that the equipment is correctly bonded for earthing purposes. These tests will
vary in detail for each application, and therefore only general guidance is included.
6.3.2 Earth Continuity
All external metal parts (such as doors, side and rear panels, roof plate) and internal panels, support rails and
other metal hardware must be tested to ensure that they are effectively connected to the main incoming
enclosure earth connection. The test is performed by injecting a current of at least 25A between the earth
connection and each panel in turn.
The measured resistance MUST be less than 0.1Ω.
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