Watlow Electric Revision 5 - Manual (Page 15)

10
3.0 INSTALLATION
There are some precautions that must be observed when installing SYSTEM 32:
WARNING: ELECTRICAL SHOCK DANGER
It is very important that all system power including the power input
be disconnected before servicing the ANAFAZE SYSTEM 32. HIGH
VOLTAGE MAY BE PRESENT EVEN WHEN POWER IS TURNED
OFF.
To reduce the danger of electrical shock always mount the SYSTEM 32
in an enclosure that prevents personnel contact.
Since the ANAFAZE SYSTEM 32 can make measurements of input signals that
are not referenced to ground, the SYSTEM 32 ground and other signal lines can
have power line or other high voltage present even if the input power is turned off.
This could happen, for example, if a thermocouple was inadvertently shorted to the
AC power line.
WARNING: USE CORRECT INSULATION TRIM LENGTH AND
WIRE GAGE
The correct insulation trim length is 1/4" or 5mm. Care must be taken
to prevent contact between any wires and the case which is grounded.
The terminal manufacturer has UL approval for #14 to #30 AWG
(American Wire Gage). ANAFAZE recommends using #18 or #20
AWG.
To effectively use the plug-in terminals, the wire insulation should be trimmed so
that the wire fits inside the terminal with no bare wire exposed. Stranded wire
should be tinned.
WARNING: SUPPORT CABLES
Power, input, and output cables should be supported to reduce strain
on the connectors and to prevent them from being pulled out of the
terminal strips.
3.1 PHYSICAL CONSIDERATIONS
The ANAFAZE SYSTEM 32 consists of a number of plug in modules for a
housing with a passive backplane. Three or six slots are provided for plug-in
option boards.
3.1.1 MOUNTING [SEE DIAGRAMS ON NEXT 3 PAGES]
For optimum performance when directly connecting thermocouple inputs
the unit should be protected from thermal shocks whenever possible. This
will minimize any temperature gradients across the terminal strips and result
in the highest accuracy.