Nordson 3100V Series Customer Product Manual page 255

B
2-22
Control
Checking
the 480 Vac
Distri bution Board Harnesses
and the Transformer
@ontd.)
Checking a Heater or Heater
Circuit
7.
Repeat the voltage measurement at pins 6 and
B of
the harness
connected to X1D.
Voltage does not measure
207-253 VAC: defective harness or
transformer.
Replace the
harness. lf
replacing
the harness does
not solve
the problem, replace the transformer.
Voltage measures 207-253 VAC: normal indication.
Go to the
next step.
8.
Measure the voltage at pins
2
and
4
of
the harness connected to X3D
on the
480 VAC distribution board and
at
TBI
positions
A and
B on
the power board.
Voltage does not measure 230
VAC: defective harness or
transformer.
Replace the
harness. lf
replacing the harness does
not solve
the problem, replace the transformer.
Voltage measures 230
VAC:
normal
indication.
Return to
the Unit
Not Powering
On
troubleshooting table.
Follow this procedure to check a heater or heater circuit.
WARNING:
Risk of
equipment damage, personal injury, or
death. Disconnect and lock
out
electrical power to the unit,
including inpuVoutput (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 heater by measuring its resistance
at
the heater connector
harness
pins.
Refer to Table B 2-5 to determine which board the
zone's heater connectors are located on.
See Figure
B 2-4 for the
location of
the connectors on the boards.
Remove the harness from
the
connector and measure the resistance
across
the harness pins
identified in Table B 2-5.
Resistance reading of zero
(0):
heater short
circuit.
Check
for a
short in the heater circuit and repair the short.
lnfinite resistance reading: open
heater
circuit or heater.
Go
to
the next step.
a
a
a
a
a
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82
EN-04-[3V-X-4XXyl-s
41-3000y
lssued 5/00
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