DP-PSUEN EN54-4 Fire Alarm Power Supply Series
– INSTALLATION & OPERATION MANUAL
DP-PSUEN Series Installation & Operation Manual Rev 11.1 220323.docx
E&OE
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AC
FLT
BAT
FLT
PSU
FLT
Wire Links
Normally Closed
Generic Fault
Output
The table below shows the relation between fault and outputs.
FAULT
OUTPUT
DISPLAY
DESCRIPTION
AC power
missing
AC
Fault
DC Power
AC Power
The front panel DC power LED will be on to indicate that DC is
available, with or without AC power, The internal AC power LED
will be off.
OP1 or OP2
shorted
PSU
Fault
PSU
The outputs will automatically retry to restore power every 5
seconds until the short is removed.
Over-
voltage
1
PSU
Fault
PSU
If the power supply voltage exceeds 30 volts, both outputs will be
switched off and a latched fault generated
2
.
Battery
connection
fault
BAT
Fault
Battery
If any of the battery connectors are disconnected a battery fault
will be generated.
Battery high
2
resistance
fault
BAT
Fault
Battery
The battery or battery connections are tested every hour and if the
resistance is over 0.18ohms, a fault is generated
4
.
PSU low
voltage
PSU
Fault
PSU
If the internal PSU power rail voltage is too low to charge the
battery, a fault will be generated
5
.
PSU
Failure
PSU
Fault
PSU
Should the switching power supply fail due to overloading, over-
temperature or a component failure, a fault will be generated.
Charging
3
Failure
PSU
Fault
PSU
Should the charging circuit fail, then a fault will be generated.
Battery Low
Fault
APS
3
Fault
Battery
If any individual battery is left to discharge below 11.5V when the
PSU is in standby mode, a fault will be generated.
NOTES
1. Over voltage protection is done at two levels, the first being where the internal power low voltage rail (nominal
24V) is monitored and the second is where the off-line, high voltage side of the switched mode power supply is
monitored. Should an off-line fault be found then the high voltage switching circuit will be disabled. In both
conditions the power supply should be switched off and the batteries removed for 15 minutes to reset the fault.
2. The battery and connection resistance is tested every hour, except when first powered up. On power-up the
battery is tested after 5 minutes to alert the installer to any potential battery condition fault. The fault threshold is
approximately 0.18 Ohm.
3. This fault condition is detected by comparing the internal rail voltage to the calculated temperature compensation
voltage. If more than 1 volt lower, then a fault will be generated.
5.9
BATTERIES
NB:
WARNING: There is a risk of fire and explosion if the wrong batteries or battery connection cables
are fitted. Care should be taken with polarity when connecting the batteries. Used batteries should be
disposed of in accordance to the WEEE directive.
Two identical batteries of the specified type shall be used, preferably from the same batch and date of
manufacture. This is important to maintain a balance of charge between the two batteries. Two cable harnesses
are provided for individual connection to the board, where they are connected in series. The remote temperature
