41
6.Protections and Failure Correction
6.1 Protections
6.1.1 Output over load protection
Model
Channel
Protection method
LAD-120
C 1
H
CH2 is
connected to
the battery
When CH1 is at 105%~120, it enters UPS mode.
the
When
total output of CH1+CH2 reaches 125%~135%, and it
enters
,
hiccup mode(For D type shuts down output).
CH2 is not
connected to
the battery
Enter hiccup mode (D series closes output), can be
recovered after restart.
CH2
Constant current limiting, recovers automatically after fault condition
removed.Fault condition does not affect CH1 output.When connected in
series with the battery, an external fuse must be installed to protect the
battery.
LAD-
240/360/600
C 1
H
CH2 is
connected to
the battery
When CH1 is at 105%~120, it enters UPS mode, the total
output of CH1+CH2 reaches 125%~135%, and shuts down
output.
CH2 is not
connected to
the battery
Turn off the output voltage, it can be recovered after
restart.
CH2
Constant current limiting, recovers automatically after fault condition
removed.Fault condition does not affect CH1 output.When connected in
series with the battery, an external fuse must be installed to protect the
battery.
6.1.2 Over temperature protection
When the automatic turns of the power supply is too high, the
power supply off the output. Recycle AC power to recover the
output after the power supply cooled down.
6.1.3 Output overvoltage protection
When the output voltage is too high and reaches the OVP
protection point, the power supply turns off the output Recycle AC
power to recover the output.
Once the LAD-600 triggers the protection, the output recovers
after recycling AC power and 3 minutes of cold standby.
6
42
6.1.4 Low battery voltage protection
When the battery voltage is too low, the power supply turns off
the output.
Model
Battery off voltage
A type
1 ±0.5V
0
B type
21.5±0.5V
C type
32±0.5V
D type
43±0.5V
6.1.5 Battery reverse connection protection
When the battery is reversely connected, the power supply is
protected against reverse connection by the internal MOSFET, the
output of the power supply is turned off, the power supply does
not damage, and automatic recover after the abnormal condition
is removed.
6.2 Failure Correction
Status
Possible Reason
Method of exclusion
Battery backup function fails
Battery is not connected or the
voltage of battery is too low
Check
check
the wiring is good,
whether the battery specifications
match the replaced battery
Can't force start
CN2: The wires are not in good
contact
Check CN2 Pin 7&8 of LAD-X series
or CN2 Pin 1&2 of LAD-xU is well
connected
When the AC power supply is
normal, it automatically shuts
down
OTP
Cool down LAD for 3 minutes before
restarting
OVP
C
whether the battery
heck
specifications match
Short
Restart after eliminating short circuit
The battery is still not fully
charged after a long charge
Batteries are aged or damaged
Replace new battery
Output wire diameter is too thin
Choose appropriate thickness of wire
Incorrect charging curve setting
Reconfirm the battery charging
curve
Note: Please contact MEAN WELL's distributor if above faulty
conditions are not corrected.
6
Summary of Contents for LAD Series
Page 26: ......