Nautel NV5, Troubleshooting Manual

Page: 20 / 228

NV5/NV3.5 Troubleshooting Manual Responding to alarms
Page 1-12 Issue 3.2 2014-12-10
Controller: IPA PS A
(or B) AC Fail This alarm occurs if IPA power supply module A (U9) or B (U10) is
reporting an ac failure, indicating its ac input voltage is less than 175
V ac. If a bank of power supply modules are indicating an AC Fail
alarm, it is possible that an ac phase loss has occurred. Check the ac
voltage applied to the suspect IPA power supply module. If the ac
voltage is acceptable, replace the IPA supply module (see
“Fan, IPA
and Module Power Supply Replacement” on page 1-43 ).
Controller: IPA PS A
(or B) Fail This alarm occurs if IPA power supply module A (U9) or B (U10) is
reporting a PS failure, indicating its output voltage is outside its
acceptable range. Check the dc voltage output of the suspect IPA
power supply module. If the dc voltage is out of tolerance, replace the
IPA supply module (see
“Fan, IPA and Module Power Supply
Replacement” on page 1-43 ). If the voltage is acceptable, suspect the
control/interface PWB (A1) or interconnect cabling.
Controller: IPA PS A
(or B) High Temp This alarm occurs if IPA power supply module A (U9) or B (U10) is
reporting a high temperature alarm, indicating its operating
temperature has exceeded its internal threshold. This alarm is most
likely caused by a module fan failure or blockage. Allow the module to
cool and attempt to
Reset
the alarm. Verify the module turns on and
its fan is operational. If the fan is not operational, inspect it for
possible blockage. If necessary, replace the IPA supply module (see
“Fan, IPA and Module Power Supply Replacement” on page 1-43 ). If
the alarm persist after replacing the module, suspect the control/
interface PWB (A1) or interconnect cabling.
Controller: IPA PS A
(or B) Module Not
Present This alarm occurs if IPA power supply module A (U9) or B (U10) is not
being detected or has been removed.
Controller: Low AC This alarm occurs if the ac input voltage is below the switching power
supplies’ internal threshold or one of the phases of a 3-phase source
has been lost. For 1-phase or 208 V ac 3-phase sources the low ac
threshold voltage is 175 V ac. For 400 V ac sources the low ac
threshold voltage is 303 V ac. Check the three amber LEDs (DS1
through DS3) in the bottom, left-hand of the transmitter. If the LEDs
are off, there is likely a problem with the ac service. Measure the ac
source voltage at the service entrance. Normally this should measure
between 180 and 264 V ac line-line [for 3-phase (nominal 208 V ac)
and 1-phase (nominal 230 V ac)] or between 312 and 457 V ac line-
line [for 3-phase (nominal 400 V ac)].
Alarm (with Prefix) Description and Troubleshooting Action