LED 4* Condition Possible Cause Action
Diagnostic
(DIAG)
Flash x1 No Output
Output fuse fail or
Output overload or
Short circuit
Check and replace output fuse.
Disconnect and test output load.
Flash x2
No Battery
Low Battery Volts. Battery disconnected or
Battery heavily discharged
Check battery connections
Check battery fuse.
Check battery condition / replace
battery.
Flash x3 Battery Fault.
High impedance in battery
connection or
Battery internal fault (detected
during load test)
Check battery connections for
corrosion. Replace battery if aged.
Flash x4 Charger Fault. Internal failure of battery charger Return to manufacturer.
Flash x5
Battery Temperature
Probe Fault.
Battery temperature monitor
disconnected or damaged &
PSU running in Safe Mode
Check temperature sensor connections
and condition of sensor.
Replace if suspect
Flash x6 Dual Path Fault.
Fault in output connections to the
load
(DUAL-PATH mode active ONLY)
Check all cables between PSU and load.
EPS relay GEN relay Condition Possible Cause Action
(COM TO N/C)
CLOSED
(COM TO N/C)
CLOSED Normal operation. Mains present &
Battery healthy None
(COM TO N/C)
OPEN
(COM TO N/C)
CLOSED Standby Mode. Mains lost &
Battery driving load Investigate loss of mains
(COM TO N/C)
CLOSED
(COM TO N/C)
OPEN Fault Present.
Blown fuses or
Battery fault or
Internal PSU fault or
Investigate fault source using
diagnostic LED &
Rectify fault where possible
(COM TO N/C)
OPEN
(COM TO N/C)
OPEN PSU Shutdown. Mains lost or
Standby battery exhausted.
Restore mains as soon as
possible.
2405ST
LED INDICATION
AND FAULT DIAGNOSTICS
Technical Support 02392 696638 #3
FAULT DIAGNOSTIC LED GUIDE
FAULT RELAY GUIDE
*when LED 4 is flashing, LEDs 1,5 OR 6 may be Green or Yellow
OP1≠OP2
DUAL-PATH ENABLED
DUAL-PATH MODE FAULT SIGNALLING
-
PSU LOAD OUTPUT
1 & 2
+
DUAL PATH LOAD INPUT
-+
-+
•FAULT SIGNALLED
WHEN MORE THAN
10% IMBALANCE
BETWEEN PATHS
REF: EN54-13 5.3.4.1
SFAULT & 5.3.4.2 PFAULT
VALUES
+
-
*Equipment must be have 2 separate power inputs capable of
withstanding a short to ground on one path
FAULT RELAY STATES
COM / NO / NC
HEALTHY
COM / NO / NC
FAULT
PAK200626_01A July 2019
