363-205-401 Power Up:
Issue 7, March 1997 Page 1 of 4
DLP-536
Check 4A or 4B Fan Unit Operation
Summary:
The 4A and 4B fan units are identical except for the air flow direction
from the shelf. The 4A or 4B has a built-in controller circuit pack. The 4A or 4B fans
will start running at +10°C (+50°F) and run at 2 speeds depending on temperature
(3600 RMP above 40•C, 3200 RMP below 40°C) and a third speed (2800 RPM) if the
SLC
###V-Rg-V###-2000 remote terminal (RT) is on batteries. The 4A or 4B fans will
begin to operate when the power shelf is equipped and the power shelf circuit
breakers are turned on. To check the 4A or 4B fans press the
CHANGE FAN SPEED
button at least 3 times to verify high, medium, and shut off speeds. The
CHANGE
FAN SPEED
button also functions as an LED TEST for the 4A or 4B fan
FAULT
indicator.
1. Verify that the power equipment has been turned up and batteries have been
installed. Verify that the power equipment DC circuit breakers are turned on.
The
CHANGE FAN SPEED
button on the fan unit
should not have been
pressed in the last 10 minutes
to perform this procedure.
2.
NOTE:
The fans will start operating if the temperature is +10°C (+50°F) or higher
and if power is supplied. The fans will not turn off until the temperature is
-10°C (+14°F) or less. The 4A or 4B provides
TEMP
voltage test jacks
that can be used to determine the temperature of the fan controller (1
volt DC per 10°C above 0°C).
If the 4A or 4B
FAULT
indicator is on (see Figure 1), proceed to Step
6
.
3. Press and hold down the
CHANGE FAN SPEED
button and verify that the
FAULT
indicator lights. Press and release the
CHANGE FAN SPEED
button
at least 3 times and verify that the fans run at high speed, medium speed, and
then off. Leave the fans in the off mode.
4. Did the fans step through 3 speeds and did the
FAULT
indicator light for the
CHANGE FAN SPEED
test?
If
YES, THEN STOP. YOU HAVE COMPLETED THIS PROCEDURE.
If
NO
, then continue with Step
5
.
5. If
FAULT
indicator did not light and/or the fans did not operate, check
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