Maintenance
Sageon III Power System
PM990-8800-00, Rev. 9
6-6
Symptom
Likely Causes
Action
batteries, cycling the AC power will
have the same effect). If the unit does
not recover by latching off again, it is
faulty.
“RECTIFIER Urgent” alarm activated
One or many RECTIFIERs are off due to
AC power failure, internal faults,
incorrect command signal from
Controller or all rectifiers are in current
limit
Check the AC power and restore.
Replace faulty rectifier modules.
Check for DC bus overload faults.
All units are latched off as HVSD
Absolute Overvoltage shutdown
protection activated. The system is
likely to have no load and without a
battery. An event on the DC bus has
caused the voltage to exceed 70V for
48V systems. The event could be caused
either by a faulty rectifier or other
equipment connected to the bus.
Add a small amount of load (>2A per
rectifier) to the system and check for a
faulty rectifier.
Check for other faulty equipment
connected to the bus that could cause the
overvoltage transient.
Use the “Reset Latched Alarm” from the
Controller to reset the system.
A rectifier is indicating “RECTIFIER
Off” or “No Response” on the Controller
RECTIFIER display
An AC failure to the rectifier is the most
likely cause. While the rectifier internal
power rails are still available, the unit
will communicate with “RECTIFIER
Off” if the AC has failed on its input.
Once the internal power dies, the unit
will no longer communicate and
Controller will indicate “No Response”.
“No Response” all the time and the
RECTIFIER is known to have AC power
indicates a communications wiring
problem.
Check the AC feed to the rectifier for a
tripped circuit breaker, blown fuse or
faulty connection.
Check the RECTIFIER communications
10-way ribbon cable for broken
connections and replace cable if
necessary.
One or more rectifiers has a current limit
or power limit alarm activated
Total load, including battery charging
current is equal to the output limits of the
rectifiers. (System overload)
One rectifier in current limit only
indicates a likely calibration problem
with the module. The Controller can
usually compensate for an out of
calibration unit in a system and will take
a few minutes to adjust the unit to
correctly share the load.
Revise the load level on the system and
expand the number of rectifiers as
required to remove the overload
condition.
One rectifier has an “UNCAL
RECTIFIER” alarm
The Controller has not been able to make
the unit share the load with the other
units. Either the RECTIFIER is faulty
(excessive internal voltage drop) and
cannot be adjusted to share load, or it is
too far out of calibration.
Replace the rectifier module. Send the
unit for repair and re-calibration.
“System Voltage Clamp” alarm
activated
Controller cannot reach the desired
system voltage. This can be due to
possible excessive voltage drop along
the DC bus bars, inside one or more
rectifiers or “System V Drop” parameter
has been set too low.
If this alarm comes up during equalize,
the maximum output voltage from the
rectifier may not be high enough to
overcome the system drops to the sense
point and allow the system to regulate at
the desired high equalize voltage.
Increase “Sys V Drop” parameter.
Replace faulty rectifier (unlikely to
current share as well).
Check that the number of RECTIFIERs
in the system is correctly set (more
RECTIFIERs than declared can generate
this problem).
Revise the requirements for high
equalize voltage level.
RECTIFIER “EEPROM Fail” alarm is
activated as indicated at the RECTIFIER
Menu for a particular RECTIFIER.
Corrupted data found on the EEPROM
inside the rectifier that is outside the
allowable data range. The rectifier
software has attempted to over-write and
has failed due to the memory cell being
damaged.
Note: excessive electrical noise can
corrupt the read data transfer, which can
lead to the same alarm being generated.
Replace the faulty rectifier if the
memory cell is confirmed to have failed.
This can be done by, modifying each of
the RECTIFIER parameters on the
Controller and checking to see if the
alarm clears. (EEPROM corrects the
data).
Check for EMC problems and
remove/reduce the source of electrical
