20
• Unicell is structurally weak, loose steel rivets, deterioration
to cell plate spacers or paper thin cell plates due to utilizing
the improper detergent.
Parts should be replaced as required.
Sometimes a flashing indicator light will clear itself by removing
the unicell(s) from the module and then installing the unicell(s)
back into the unit.
The Bench Test Procedure will determine which unicells are
causing a flashing indicator light, refer to Section 10.7.
Place toggle switch in the off position; connect all wires which
have been disconnected and install unicell(s).
The high voltage probe can be used to determine which circuit
is arcing by isolating each circuit ionizer or collector cell.
1. Disconnect high voltage wire #7 (collector cell) and measured
high voltage to the ionizer circuit (high voltage wire #8).
2. Connect high voltage wire #7 and disconnect high voltage wire
# 8.
3. Measure high voltage to the collector cell circuit (high voltage
wire #7) Fluctuating high voltage during a measurement will
indicate an arcing circuit.
RISK OF ELECTRICAL SHOCK.
The high voltage circuits to the ionizer and collector
should be grounded before removing the power pack,
high voltage wires, door feed through insulators and
unicell(s). The grounding procedure can be accom-
plished by waiting one minute after placing the toggle
switch in off position or refer to Figures 12 and 13. The
grounding procedure statement is not identified within
the bench test procedure but should be performed.
The power pack total current output is limited to a
maximum of 5 milliamps to assure personnel safety.
!
CAUTION
Testing the Ionizer
1. Select one unicell to be tested.
2. Connect one high voltage wire to the ionizer contact spring and
to the power pack connector identified as “Ionizer #8”.
3. Connect the other high voltage wire (use as a ground wire) to
the metal frame of the unicell and to the ground stud on the
power pack.
4. AC cable should be connected to the power pack conectors
5 and 6 with ground wire secured to the ground stud on the
power pack.
5. Connect AC cable plug to the wall outlet.
6. Measure high voltage with the high voltage probe, ionizer volt-
age should be 10.0 to 11.8 KVDC, not to exceed 12.0 KVDC.
If ionizer voltage exceeds 12.0 KVDC, the ionizer wires are
moderately to extremely coated with contaminant (clean ionizer
wires), or the power pack is not within specifications.
7. If there is an arcing condition, determine the problem and repair.
8. Disconnect AC cable plug from the wall outlet.
High Voltage Specifications:
Ionizer Circuit Operating Range: 10.0 to 11.8 KVDC
Collector Cell Circuit Operating Range: 5.0 to 7.5 KVDC
This procedure can be utilized to determine an electrical problem
with the unicell(s) or a power pack or testing the unicell(s) after
manual cleaning.
Do not use a power pack that is not within the high voltage speci-
fications, refer to “Testing the Power Pack” (Page 23).
Figure 18
High Voltage Measurements at the Power Pack
10.6 High Voltage Probe Measurements
A high voltage probe (refer to manufacturers instructions) is
required to measure high voltage output from the power pack.
Refer to Figure 18. The component door should be closed with
the indicator light illuminated. If the indicator light is flashing or not
illuminated perform step 1 and if required step 2.
1. Place toggle switch to the power pack enclosure in the on
position.
2. Open the lid door to the power pack enclosure and connect
the ground wire from the high voltage probe to the bare metal
push rod.
3. Engage the interlock switch and place the tip of the high
voltage probe to the ionizer door feed through insulator. The
high voltage measurement should be 10.0 to 11.8 KVDC. If
the ionizer voltage is below specifications refer step 2, “Ionizer
Conditions Causing Failure”. Bench Testing may also be
required. Low ionizer voltage will decrease the collector cell
voltage, but low cell voltage will not affect the ionizer voltage.
4. Engage the interlock switch and place the tip of the high
voltage probe to the collector cell door feed through insulator.
The high voltage measurement should be 5.0 to 7.5 KVDC.
If the collector cell voltage is below specifications refer step
2, “Collector Cell Conditions Causing Failure.” Bench Testing
may also be required. Low ionizer voltage will decrease the
collector cell voltage.
10.7 Bench Test Procedure
