10
Improper blower speeds adversely affect system
performance. Contact Parker before adjusting motor
variable pulley settings.
4.1.7 Power Pack Operation
The power pack voltage range is 90 to 130 AC, 60 Hz, supplied
by the unit Main Electrical Panel or electrical panel supplied by
others. If the electrical panel is supplied by others the power
pack circuit should be electrically interlocked with the blower
circuit. The PSG will be operating in an unsafe mode if an
electrical interlock is not installed. The power pack indicator light
on the unit is illuminated when high voltage output is within
specifications. If the indicator light is flashing or fails to illuminate
refer to Section 10 Troubleshooting.
4.1.8 Remote Status Panel
The remote status panel (a remote amber light to each power
pack enclosure indicator light circuit identified by a letter/
number) will display the following conditions. The amber light(s)
could be integrated with the unit Main Electrical Panel or as a
separate panel, refer to unit Electrical Drawings.
Amber light(s) will be illuminated under normal conditions,
high voltages within specifications.
Amber light(s) are in the flashing condition, high voltages are
not within specifications. The PSG system is online.
Amber light(s) are not illuminated, PSG system is off line, or
amber light/flasher module has failed, refer to troubleshooting
section.
Maintenance procedures and the majority of the troubleshooting
section refer to the power pack enclosure indicator light.
Figure 8
Adjustment Motor Pulley Settings
4.1.6 Adjusting Motor Variable Pitch Pulley
Increasing blower speed (RPM) will increase airflow (CFM) and current
amperage. Refer to Figure 8. To increase speed, close the variable
pitch pulley (from “normal,” as in Figure 8A, toward “full closed,” as in
Figure 8B). Decreasing blower speed will decrease airflow (CFM) and
current amperage. To decrease speed, open the variable pitch pulley
(from “normal,”as in Figure 8A, toward “full open,” as in Figure 8C).
To adjust the variable pitch pulley:
1.
Loosen motor base nuts, adjust motor slide base and
remove the drive belt.
2. Loosen set screw “A” to clear the drive key between pulley
halves.
3. Remove the key.
4. Adjust pulley in increments of one turn to the desired setting.
5. Install key and tighten set screw “A.”
6. Install drive belt.
7. Loosen set screw “B.”
8. Align belt centerlines of motor and blower pulleys using
straight edge and square.
9. Set belt tension using a belt tension gage.
Some system exhaust blowers will not have an adjustable motor
pulley.
Check operation of each amber light by placing the power pack
toggle switch in the off position, one at time, amber light should
be flashing corresponding to module identification on remote
status panel.
The remote status can be in the configuration of a beacon light
instead of individual amber lights. The beacon light is common
to all the modules. The beacon light is illuminated when a failure
occurs to one or more modules.
4.1.9 Power Pack Enclosure Push Rod and
Grounding Bar
Each power pack enclosure has a captive, spring loaded “push
rod” extending into the module.
Factory-set, the push rod serves the following purposes:
1. High voltage DC power is automatically shut down with the
unicells removed from the module.
2. Whenever a module door or power pack enclosure lid
cover is opened, the limit switch is disengaged, placing
115 VAC off line to the power pack.
3. Opening either of the module door or the power pack
enclosure lid cover also releases the spring loaded push-
rod, placing the grounding bar in contact with the cell door
feed through insulator acorn nut, removing residual cell
voltage.
The opening of only the module door is such that
the grounding bar may not completely short out the cell
circuit. As a precaution, perform the grounding proce-
dure, refer to Figures 12 and 13.
CAUTION
CAUTION
