Installation Manual

ValveWatch II Hardware Installation and Setup Manual
Page 17 of 34
CRANE
Nuclear
5 Local Data Acquisition Unit Installation
The Local Data Acquisition Unit (LDAU) consists of DIN rail mounted electronics modules
enclosed in a stainless steel IP66 enclosure. The number of modules and configurations may vary
with customer options. There is one LDAU for each valve being monitored.
Mount the electrical enclosure according to specific site mounting specifications or codes. Use
caution not to damage the radio frequency antenna if pre installed on the electrical enclosure. The
antenna is electrically isolated from earth ground and should not touch adjacent metal structures. If
the RF communications model is being installed, the unit should be mounted to prevent personnel
from having normal access within a 20 cm distance from the antenna.
Low voltage DC power supply cables must be rated for temperatures from -40 to 70 degrees C and
have a 300 volt working operating voltage.
Route the low voltage DC power supply cable(s) from the ValveWatch HUB Assembly location in
the non-hazardous area to the ValveWatch Local data Acquisition Unit in the hazardous area
according to specific site cable routing specifications or codes. Connect power supply conductors
to the LDAU according to J-51008ExS. Assure that the proper sealed cable entry glands are used.
It is critical that the wiring be installed correctly. There are two power lines associated with the
system. One power is dedicated to the sensor modules and the second power pair is associated
with the communications power. Properly label the individual wires on both LDAU and HUB side
of the field cabling. Discrete color coding and proper polarization will help assure the system is
wired and working correctly the first time.
The LDAU modules have reverse polarization protection. Connecting the wires incorrectly will
cause no power to flow into the system.
Caution:
The LDAU must be installed per Installation Drawing J-51008ExS.