Sageon III Power System
Maintenance
PM990-8800-00, Rev. 9
6-5
6.7 TROUBLESHOOTING
Symptom
Likely Causes
Action
Rectifiers do not power up – no LEDs lit
on front panel
AC power is not connected or internal
fuse blown or rectifier not properly
plugged in.
Re-insert rectifier(s) and make sure the
rear connections are good. Confirm that
AC power is available to the rectifier
backplanes. Replace the rectifier module
if the unit is suspected to have failed.
No output current from rectifiers and the
Green LED on each rectifier blinks
occasionally
AC power either <70VAC or >320VAC.
An internal relay will be heard open and
close periodically if the AC voltage is
excessive.
Check that the AC supply voltage and
connection arrangement are correct and
match the expected system supply
wiring.
Over-temperature alarm or fan failure
alarm present
High ambient temperature.
Fan air intake/exhaust vents are blocked
or a fan is jammed with a foreign object
or excessive dust.
Check the ambient temperature and
improve site cooling if possible.
Check and remove obstructions from the
air vents. Replace the module or remove
and replace the fan assemblies in the
module (requires only that the rectifier
lid be removed)
LVBD will not close
One or more batteries are reverse
polarity.
No battery is connected to the battery
distribution module.
Fuse link blown in the battery
distribution module (BDM).
Controller setting for LVLD is “Off”.
Low Voltage Load Disconnect setting is
greater than the current bus voltage.
Check battery wiring polarity.
Connect a battery.
Check that the Controller is powered up
even when no rectifier is operational. If
not, service the fuses in the BDM.
Set LVLD to “On”.
Power up the rectifiers and reduce the
load until the bus voltage increases to the
float voltage.
Load or Battery circuit breaker alarm
does not set when the breaker is opened
or is incorrectly alarmed as battery
switch instead of load trip or visa-versa.
No battery or load alrm/aux switch is
connected to the circuit breaker
connection.
Alarm link in BDM is incorrectly
configured.
Check load and battery alrm/aux switch
connections to the BDM and that the
alarm links are correctly configured.
Battery or Ambient temperature sensor
reading is indicated as “Not Available”
Sensor / cable faulty.
Sensor connector reversed.
No sensor installed.
Turn cable connector around and
reconnect.
Replace faulty sensor assembly.
Battery current indicated does not match
independent measurement.
Full-scale current of the DC hall effect
current transducer is incorrectly set and
will result in an error larger than +/- 5%
at more than 50% full-scale current.
Change the setting of the “FS Batt Curr”
value in the Base Menu of Controller to
the correct full-scale value.
Battery current indicates 0A when more
than 5A is flowing in the battery or is
inaccurate at low currents (<5A)
Transducer is not calibrated
DC hall effect transducer or wiring is
faulty.
Current transducer sensitivity is too low
for 1A measurement.
Calibrate transducer
Service the DC current transducer –
check the wiring is intact and still
connected properly, or replace the DC
CT is suspected to be faulty
Revise size of DC CT full-scale value
for the size of the load and battery
charging requirements.
Load current indicates 0A when known
to be >5A
Number of RECTIFIERs is incorrectly
set too low or the battery current FS is
set too high. The load current is
calculated from the sum of the
RECTIFIER currents minus the
measured battery currents
Check that the number of RECTIFIERs
in the Controller Base menu matches the
actual number of rectifier modules
installed.
Check the Battery DC CT rated full-
scale value is correctly set in the Base
menu.
One unit is alarmed as HVSD (high
voltage shutdown) and is latched off.
The unit has developed a fault that
causes it to output a voltage above the
HVSD protection limit and has been
supplying load current while above this
voltage limit.
A random event on the DC bus has
occurred that forced a unit into HVSD.
Replacing the rectifier module is
recommended. However, a random
event may have triggered the HVSD and
to determine if the unit has a real fault,
the HVSD latched alarm can be reset
using the “Reset Latched Alarm”
function in the Controller RECTIFIER
Menu. (If the system does not have any
