QUANTUM™ LX/HD SYSTEM INTERFACE PANEL
INSTALLATION-OPERATION-MAINTENANCE
090.030-IOM (OCT 13)
Page 20
POWER SUPPLY
DESCRIPTION
The power supply of the SIP control panel consists of a
DIN rail mounted 12 VDC power supply, located on the
inside of the front door.
This supply is adjustable and has a green LED indicator to
show that it is powered.
POWER DISTRIBUTION
DC power from the power supply is wired directly to a wir-
ing harness that supplies power to the Q5 control board.
MEASURING VOLTAGE
CAUTION!
Measuring and adjusting the power supply
voltage requires the control power switch to be ener-
gized. Extreme care must be observed when taking any
readings, as 120 or 230 VAC (depending on incoming sys-
tem voltage) will be present next to the power supply.
Adjusting the supply requires the use of a small insulated
Philips screwdriver inserted into the supply to access an
adjusting potentiometer.
CAUTION: It is possible for the
screwdriver (and the person making the adjustment)
to come into contact with potentially lethal voltages.
Proper Personal Protective Equipment (PPE) measures
need to be observed.
The Q5 control panel requires accurately adjusted DC
voltages to function properly. Periodic measurement and
adjustment of the DC power system is recommended for
optimum system operation. Over time, it is possible for
temperature, humidity, vibration and component age, to
degrade the accuracy of these voltages. If the DC voltage
begins to stray from its optimum range, mysterious prob-
lems can begin to arise.
Some examples of problems could be:
•
Loss of or intermittent communications failures.
•
Q5 reboots for no apparent reason.
•
LED's on the Q5 are lit, but nothing appears on
the display.
To perform measurements and adjustment on the power
supply voltage, use a reliable, calibrated Digital Volt Meter
(DVM). The DVM should be accurate to 1/100 of a volt DC.
With the control power switch turned ON, wait until the
List page appears. This is because the graphics required
to create this screen will draw more current than when
the screen is not fully booted. If the screen never appears
however (possibly due to a voltage problem), you will
need to proceed regardless of what is or is not displayed.
In order to properly measure the DC power, it must be
checked at the DC power supply.
Ensure that the meter is set to the proper range (DC, 0-50
V or equivalent), as well as observing proper wire polarity.
The acceptable range for the supply is as follows:
•
12 Volt Supply (+12.10 to +12.20 Vdc)
120 VAC
or
240 VAC
DC
DC
Voltage
Adjust
Power Supply
+12 VDC Adjustment
Place the negative lead on the minus (-) terminal
of the supply, and the positive lead on plus (+).
Verify that the DVM is displaying in the range of
+12.10 to +12.20.
If adjustment is required, locate the adjust-
ment access hole on the supply, as previously
shown. While watching the DVM, slowly rotate
the screwdriver blade clockwise to increase the
voltage or counter-clockwise to decrease until
the voltage is correctly adjusted.
NOTE: Extreme
care must be used when adjusting the po-
tentiometer. Adjustment should only be per-
formed by quali
fi
ed personnel. The use of a
non-conductive device is recommended.
POWER SUPPLY REPLACEMENT
If the power supply is found to be bad, or not capable
of acceptable adjustment, the supply will need re-
placing. Refer to the Recommended Spare Parts list
for the part number.
