Control B
2-25
Checking an RTD or RTD
Circuit
Follow this
procedure
to check an RTD or RTD
circuit.
NOTE:
lf the faulted zone is
a hose or a
gun, you
can remove the hose
or
gun
and replace it with
a hose or
gun
that is known to be
good.
lf the
fault
disappears,
then the
problem
is in the hose
or
gun,
not inside the
unit. As an alternative
to using this
procedure, you
can refer to
your
hose
or
gun
manual for instructions
on checking
the hose
or
gun
RTD and
replacing
the
gun
RTD.
WARNING:
Risk of equipment
damage,
personal
injury or
death. Disconnect
and lock
out electrical
power
to the unit,
including inpuUoutput
(l/O)
lines.
1. Place
the unit's POWER switch
in the off
position,
disconnect and
lock out electrical
power
to the
unit at the branch circuit disconnect
switch,
and disconnect and lock
out electrical
power
supplied through
any l/O wiring.
2.
Open
the
electrical enclosure.
Refer to Opening and Closing the
Electrical Enclosure.
3. Check the RTD
by measuring
its resistance. Refer to Table
B
2-6
lf the RTD
is defective, replace
the RTD. lf a hose RTD is
defective,
you
must replace
the hose. To replace a
gun
RTD,
refer to
your gun
manual.
To replace a tank RTD, refer to
Replacing an RTD or
a Thermosfatin Repair Procedures.
NOTE:
Flex the hose when
you
are checking a hose RTD.
Some
hose FITDs
exhibit
problems
intermittently.
lf
the RTD is
good, go
to the next step.
a
a
o
2000 Nordson
Corporatlon
All rights reserved
41-3000v
lssued 5/00
82EN-04-[3V-X-4XXVj-5