Elmdene 2402STE Bedienungsanleitung Seite 2

Features
Loss of Mains and Brown-out compensation
If the mains input has been lost for greater than 10s, a Loss of Mains condition is detected, an EPS Fault is signalled and the green Mains LED is
extinguished. Short duration mains "brown-out" conditions are not signalled thus reducing nuisance alarms. The red Fault LED will show a heart-
beat pulse indicating that the PSU is operating correctly in standby mode.
Standby Operation
When the mains input is lost, the power supply will automatically switch to the standby batteries and provide uninterrupted power the connected
load whilst there is capacity in the standby batteries. The front panel Fault LED is pulsed periodically to indicate that the PSU is healthy and
operating in standby mode.
During standby operation, the standby battery voltage is continually monitored. Once this drops below the Low Battery Voltage threshold
(approximately 23V), a PSU Fault signal is generated and a Low Battery condition is signalled on the front panel LED.
Battery Management
The standby batteries are tested regularly. If a battery becomes disconnected, a PSU Fault signal will be generated within 20s of the
disconnection.
If the impedance of the battery circuit connections increases above 500mΩ, for example due to corrosion or damage to the cabling, a PSU Fault
signal will be generated within 60 minutes.
If the battery is unable to supply significant current to the load, for example due to cell degradation, a PSU Fault signal will be generated within 24
hours.
Battery Charging
The standby batteries are charged automatically when the mains is present. The PSU uses a fast bulk charge regime to quickly recharge the
batteries to approximately 80% capacity followed by a reduced charging current to reach full capacity. The batteries are held at full capacity using
a temperature compensated float regime. The battery temperature is measured at its terminals using a special sensing probe. An extended probe
may be fitted for use with an external standby battery pack.
Note: if the batteries are disconnected the battery charger is switched off and there will be NO measurable voltage at the BATT terminals.
Battery Auto-Start
The power supply will self-start if a set of charged standby batteries are connected without any mains present. An EPS Fault signal will be
generated under this condition.
Note: a pause of 5s must be observed between repeated battery connections and disconnections to guarantee an auto-start.
Signalling
Fault Outputs:
100mA @ 60Vdc solid state relay (Open indicates fault condition)
EPS Fault PSU Fault
C C
LOSED LOSED
O C
PEN LOSED
C O
LOSED PEN
O O
PEN PEN
Local Indicators – front panel
Red LED Green LED
Fault Mains
O O
FF N
F
LASH
O or O
N FF
C
ONTINUOUS
1 P O
ULSE FF
Diagnostic Indicator – internal
Red LED Green LED
Diagnostic Mains
O
N
O
FF
O
FF
O
N
O or O
N FF
C
ONTINUOUS
F
LASH
O or O
N FF
C
ONTINUOUS
1 P O
ULSE N
O
N
2 P
ULSES
O
FF
3 P O or O
ULSES N FF
4 P O or O
ULSES N FF
5 P O or O
ULSES N FF
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Condition
Normal operation Mains present
Battery fully charged
Standby Mode Mains lost
Battery driving load
Fault Present Blown fuses
Battery fault
Overload
Internal fault
PSU Shutdown Mains lost
Standby battery exhausted
Condition
Mains present
Normal operation
Battery fully charged
Blown fuses
Battery fault
Fault
Overload
Internal fault
Mains lost
Standby Mode
Battery driving load
Condition Possible Cause
Mains present
Normal operation
Battery fully charged
Mains Lost. No faults present
Standby Operation
Battery driving load
Software fault detected
Internal Fault
PSU running in Safe Mode
Output fuse blown
No output Output overload
Output short circuit
No faults active
Battery Charging Battery charging normally but
< 90% of full charge
Battery disconnected
No Battery Battery fuse blown
Battery heavily discharged
Standby Mode
Low Battery Volts
Battery almost discharged
High impedance in battery
Battery Fault connection
Battery internal fault
Charger Fault Internal failure of battery charger
Battery temperature monitor
Battery Temperature
disconnected or damaged
Probe Fault
PSU running in Safe Mode
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Possible Cause
None
Investigate loss of mains
Investigate fault source using
diagnostic LED
Rectify fault where possible
Restore mains as soon as
possible
Possible Cause
None
Contact service engineer
Investigate loss of mains
None
Investigate loss of mains
Return to manufacturer
Check and replace output fuse
Disconnect output load and test load
None
Check battery connections
Check and replace battery fuse
Check battery terminal voltage and
replace if battery aged
Restore mains as soon as possible
Check battery connections for damage
e.g. corrosion. Replace battery if aged
Return to manufacturer
Check temperature sensor
connections and condition of sensor
and cable
Replace if suspect
Action
Action
Action