B
2-12
Control
Under-Temperature
(UT)
Warning
WARNING:
Risk
of equipment damage,
personal
injury or
death.
Some troubleshooting
procedures
require
you
to
perform
work inside
the electrical enclosure with
the
power
on.
Follow
electrical safety
procedures
and observe
all
high-voltage
indicators. Refer
to Electrical
Safety
During
Troubleshooting
and
Opening
and Closing the Electrical Enclosure
before
performing
any troubleshooting
procedure.
1.
Press the
CLEAR FAULTS key
and
wait for
the system to return
to
the system-ready
state.
2. lf the warning
disappears
and the unit appears to be working
again,
the
voltage
to the unit may have temporarily
sagged or
you
may have
an intermittent
problem.
Repetitive warnings
in the same zone
indicate
a
problem
with
the circuitry in that zone ot an intermittent
RTD failure.
Take the following
steps to troubleshoot intermittent
under-temperature
warnings:
a. Check for
a change in environmental
conditions, such as added
ventilation
or sources of drafts. A
cold draft can keep
your
unit,
hoses,
and
guns
from heating.
b. Make
sure the
power
is turned
on at
your
branch circuit disconnect
switch
and that
your power
supply
is supplying the
proper
voltage
to the unit.
c.
Check all hose and
gun
electrical
plugs.
Make sure the
connections
are tight and free
of corrosion.
When the
FAULT
light....
And the
Selector
display..
And the
Multipurpose
display...
It means...
Do this...
Flashes
(See
Note A)
Shows a
zone number
(refer
to
Table
B 2-3)
Flashes
UT
(See
Note B)
UL
The
indicated zone's
actualtemperature is
more
than
19.5
'C
(35
'F)
below the setpoint
temperature.
Refer
to the following
procedure.
NOTE
A: When
the FAULT light flashes,
the warning
output contact
is open and the fault output contact
is closed
When
the FAULT light
is off, both output
contacts are closed. For
more information on
these output
contacts,
refer to
Connecting Output
Contacts in lhe lnstallafion
section.
B:
UT
(under{emperature)
occurs when
a heater zone
is more than 19.5
C
(35
F)
under the setpoint
temperature.
82EN-04-[3V-X-4XXU-5
41-3000y
lssued
5/00
@
2000 Nordson
Corporation
All rights reserved
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