8
At the start of the cleaning process, electrical
switches that could be accidentally activated shall
be locked out. Components of the fire suppression
system (if installed) shall not be rendered
inoperable during the cleaning process.
Care should be taken not to apply cleaning
chemicals on any fusible links or other detection
devices of the automatic extinguishing system.
6. Troubleshooting
WARNING:
EXERCISE THE USUAL PRECAUTIONS WHEN WORKING
WITH HIGH VOLTAGE. THE MAXIMUM OPERATING
OUTPUT FROM THE POWER SUPPLY IS 15,000 VDC AND
5.5 MA. to 11.0 MA. WHEN IN PARALLEL.
IF SAFETY SWITCHES ARE CLOSED AND CIRCUIT IS
ENERGIZED, DO NOT TOUCH HIGH VOLTAGE. WHEN
THE CIRCUIT IS DE-ENERGIZED, ALWAYS BLEED OFF
REMAINING STATIC CHARGE WITH AN INSULATED
HANDLED SCREW DRIVER BY SHORTING to GROUND
THE POINTS OF HIGH VOLTAGE DC POTENTIAL
.
WARNING
Risk of Electrical Shock
The servicing Instructions are for use by qualified
personnel only. To reduce the risk of electric shock,
do not perform any servicing other than that
contained in the service instructions unless you are
qualified to do so.
A. Introduction
This section on troubleshooting provides a
description of potential malfunctions, their cause,
location and correction. A Trouble Reference Chart
listing the most probable causes and corrections
follows the general text.
The electronic air cleaner is the unit within the
system that has the highest efficiency collection
rating and is also the one with the highest potential
for malfunction. When a malfunction does occur, the
outage is usually found in the electrical secondary
circuit in the ionizing-collecting cell(s).
Indicating lights are installed in the face panel of the
control to monitor the electrical operation of each
power supply and the ionizing-collecting cell(s) they
energize. The quantity of power supplies per unit is
dependent upon unit size with one or two power
supplies for each ionizing-collecting cell tier in
height. Other than the basic hand tools, it is
advantageous to have a volt/ohm/milliammeter with
a 20 KVDC high voltage probe. These instruments
are standard catalog items by several
manufactures.
B. Secondary Short Circuit
The most common outage is a short in the
secondary circuit and is best located through the
process of elimination. Symptoms are a flickering
indicating light accompanied by an arcing noise in
the ionizing-collecting cell(s) or an indicating light
that is not glowing.
A flickering light with an arcing noise is an indication
of a high resistance short circuit and a light that is
not glowing is an indication of a dead short. (A light
that is not glowing can also be an indication of an
open circuit in the primary circuit. Refer to the
paragraph on open circuits.) The short may be in
the power supply, the high voltage cables or the
ionizing-collecting cell(s). To isolate the short to any
one of these three components, proceed as follows:
WARNING
When safety interlock switches are closed, do not
come in contact with high voltage components. The
operating output from the high voltage power
supply(s) is 12,600 VDC and 6 MA. to 11.0 MA.
When the power supply(s) is de-energized there Is a
20 second delay for the voltage to decay. Always
short from ground to a point of high voltage with a
well Insulated jumper wire or an insulated handled
screwdriver to bleed-off any remaining residual
charge.
1.
Disconnect both high voltage leads from their
respective terminals in the power supply and
support them away from any point of contact.
2.
Energize the power supply:
a. If the light still flickers or does not glow, the
trouble is indicated to be in the power supply. First,
check the inline fuse mounted on the circuit board
and replace if it is blown. Second, replace the power
supply in its entirety.
b. If the light glows steady with the leads
disconnected the power supply is indicated to be
normal.
NOTE: It will be necessary to close the access door
electrical interlock switch operated by the access
door, to complete the primary circuit to the power
supply.
3.Next reconnect both high voltage leads to their
respective terminals inside the power supply and
disconnect them at the ionizing-collecting cell(s).
Support them away from any point of contact and
energize the power supply.
a. If either high voltage lead is defective the light will
indicate the trouble. Each lead may then be checked
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