GatesAir Inc. CZF User Manual
APEX
™
Exciter Incorporating FLO
™
Technology
Maintenance and Troubleshooting
Exciter Troubleshooting
Page: 5-20
888-2604-001
03/08/07
WARNING: Disconnect primary power prior to servicing.
A faulty controller board may be the cause of a bad front panel display. If LEDs 0
through 7 are scrolling, the fault is probably a cable going to the front panel board or
the board itself. If they are not scrolling, and the controller board power supplies are
ok, change the controller board.
through 7 are scrolling, the fault is probably a cable going to the front panel board or
the board itself. If they are not scrolling, and the controller board power supplies are
ok, change the controller board.
5.8.3
Power Supply Voltages
Circuit board operating voltages are listed on most of the status screens. If the voltages on
these screens are out of tolerance, a red fault indication appears to the right of the voltage
indication.
these screens are out of tolerance, a red fault indication appears to the right of the voltage
indication.
If one or more of the +5, +15, or -15 volt supplies are faulted on more than one board, or if
the display is dark and cannot be illuminated by touching it, the regulated power supplies
in the top (analog) side of the exciter should be checked.
the display is dark and cannot be illuminated by touching it, the regulated power supplies
in the top (analog) side of the exciter should be checked.
The power supply voltages are listed in Table 5-3.
Warning
Removal of the plastic shield which covers the exciter power sup-
ply and fan exposes 120 Vac to the technician. Therefore, proper
procedure for measuring voltages in the following paragraphs re-
quires prior removal of all power before the plastic shield is re-
moved from the analog tray. The test meter is to be located outside
the shield and the plastic shield replaced prior to applying power.
ply and fan exposes 120 Vac to the technician. Therefore, proper
procedure for measuring voltages in the following paragraphs re-
quires prior removal of all power before the plastic shield is re-
moved from the analog tray. The test meter is to be located outside
the shield and the plastic shield replaced prior to applying power.
All of the power supply voltages can be accessed by removing the top cover of the supply.
• The three 15 volt supplies can be measured at J4 of the UDC Interface board or at
SK2 of the power supply, refer to Table 5-3 for the pin numbers.
• The 5 volt supply can be measured at J6 of the controller board (bottom side of the ex-
citer) or at SK3 of the power supply, refer to Table 5-3 for the pin numbers.
A short in the wiring or in one of the circuit boards could cause a supply voltage to fold
back (to zero volts). This can be checked by unloading the supply one circuit board at a
time.
back (to zero volts). This can be checked by unloading the supply one circuit board at a
time.
If the supply is totally dead, follow all precautions listed in the warning above and check
the fuse located in the power supply input filter assembly.
the fuse located in the power supply input filter assembly.
Table 5-3 Exciter Power Supply Voltages
Voltage
Use
Tolerance
PS Jack and Pin
Destination Jack and Pin
+5 Vdc
Power for digital tray
SK3 pin 2
Controller, J6 pins 10 - 13
Common for +5 V
SK3 pin 1
Controller, J6 pins 1 - 4
+15
Power for analog tray
SK2 pins 1 - 2
UDC Interface, J4 pins 1 - 2
-15
Power for analog tray
SK2 pin 6
UDC Interface, J4 pin 6
Common for +/- 15 Vdc
SK2 pins 3 - 5
UDC Interface, J4 pins 3 - 5
+15 Vdc Float
Fan power
SK2 pin 8
UDC Interface, J4 pin 8
Common for +15 Vdc Float
SK2 pin 9
UDC Interface, J4 pin 9