User's Manual

4
Model PSU138 Power Supply
Important Safety Information
The Model PSU138 Power Supply must be mounted in a ventilated cabinet/enclosure designed
to house 240V AC mains electrical equipment.
The cabinet must be in a protected indoor environment, close to a 240V electrical supply, e.g.
an electrical cupboard. Connections to the 240V AC mains supply must be carried out by a
qualified electrician or similar competent person, and made in accordance with accepted safety
practices. A good mains safety earth must be connected to cabinet and Power Supply. A two-
pole switch (as provided by a Consumer Unit or Switch-Fuse) must be included to isolate both
Live and Neutral during Installation or Maintenance. The circuit must be protected by a current
limiting fuse or other device with a maximum rating of 5A.
The transformer is protected by a fuse; always replace this with the correct type and rating:
T315mA 250V (20mm glass fuse, 315mA, 250V, Time delay, approved to
BS EN 60127 or equivalent.)
Mains Cables
Use only mains cable to BS6004, BS6500, or equivalent, within the following specified limits:
Minimum Maximum
Conductor Diameter 1.0mm (0.75mm
2)
2.25mm (4mm
2)
Cable Diameter 4.0mm 8.0mm
When fitting the cables (both primary and secondary) only feed them through the blind
grommets provided, first cutting a slit in each. Do not remove the grommets or make any other
holes.
Battery
The enclosing cabinet must be vented to avoid the build-up of gases. Do not block any vents
which maybe apparent. Care must be taken to ensure the battery terminals are not shorted
together by metal objects as this may constitute a Fire Hazard. Observe the correct polarity
when connecting:
Red wire - Positive
Black wire - Negative
The Battery is protected by a fuse, always replace this with the correct type and rating:
F3.15A 250V (20mm glass fuse, 3.15A, Fast Blow, approved to BS EN
60127 or equivalent.)