FRICK
QUANTUM™ COMPRESSOR CONTROL PANEL S90-010 M
MAINTENANCE Page 21
to find a short to earth problem is to disconnect all the
sensor plugs and ohm out each plug screw terminal to
earth for open (infinite) impedance. All sensors should
read open to earth with the exception of the CT motor
current channel. One side of the CT is grounded in the
Motor Control Center (MCC). (The third pin on pressure
sensors is ground.)
Replacing a Defective Analog Board
The procedure to replace an Analog board is outlined
below:
1. Shut off control power.
2. Remove the old board from the machine and the
new board from its packing and place both on an
anti-static surface.
3. Remove any required chip(s) from the defective
board and install them in the replacement board.
4. Check that all jumpers, dipswitches and
components are properly setup on the new board
as it was on the old board.
5. Install the modified replacement board in the
panel.
Adding Analog Board 2
The procedure to add Analog Board 2 is outlined below:
1. Remove the new board from its packing and
place it on an antistatic surface.
2. Make sure the board’s dipswitch ID has been set
properly.
3. Check that all jumpers and components are
setup properly (refer to the Analog Settings
tables at the end of this section).
4. Shut off control power.
5. Install the new board in the panel. See the
Control Center Assembly (refer to the
QUANTUM™ DRAWINGS list for drawing
number) for proper mounting location of the
board.
6. To prevent possible noise problems from
improper wiring:
• When routing wiring to the terminal strip,
keep as much separation as possible
between the Analog boards wiring and the
AC control wiring of the Digital I/O boards.
• DO NOT run any AC lines parallel to sensor
lines!!
• All DC analog wiring is to enter the panel on
the left side. All AC digital wiring is to enter
on the right side of the panel.
After replacing or installing an Analog Board and powering
on the control panel, select [Detect I/O Boards] from the
“Change Communications” screen in Panel Setup (this
section appears later in this manual). This selection
provides a method to detect all connected Analog and
Digital boards. If a board has been removed, a
communication error shutdown will be issued until this key
is selected. The “About” screen will show what was
detected.
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