PULSAR MEASUREMENT
25
Terminal Connections
Power
The UltraTWIN can operate from mains AC and automatically from DC or
battery backup in the event of power failure or can be operated permanently
from DC or batteries.
The AC and DC wiring should be completed using either 16
–
14AWG (1.5
–
2.5mm
2
) stranded or 16
–
14AWG (1.5
–
4mm
2
) solid wire.
An external supply isolator/circuit breaker (AC or DC) must be fitted near to
the unit and labelled to identify the instrument to which it refers.
Important Information
All terminal connection screws should be tightened to 4.5in.lbs. (0.5Nm).
Care should be taken not to overtighten the screws.
Important Information
The protective earth must be connected prior to any other cabling taking place.
This is connected to terminal 3, on all wall mount units, and should be tightened
to 4.5in.lbs. (0.5Nm). In the case of the fascia unit the earth should be connected
to the stud at the rear of the enclosure and tightened to 7.4lbF (10Nm).
