BLVD
The power supply system has load low voltage disconnection (LLVD) function and battery low voltage
disconnection (BLVD) function.
LLVD means when the mains fails and batteries supply power, the power supply system cuts the non-priority
load off when the battery voltage drops down to 44V. In this way, the battery remaining capacity can sustain the
priority load longer. The LLVD voltage is settable, refer to
4.7.2 Battery Settings
for setting method.
BLVD means that when the battery voltage drops down to 43.2V, the power supply system will cut off the battery
automatically to avoid shortening the battery life owing to the over-discharge of the battery. The BLVD voltage is
settable, refer to
LVD parameters
in
4.7.2 Battery Setting
for setting method.
BLVD and LLVD function is enabled before delivery, which means that if power outage lasts for a long time or
the power supply system fails, there might be LLVD and BLVD. Users should connect the non-priority loads to
LLVD routes, and connect the priority loads to BLVD routes according to the importance of the loads. For vital
loads, users can disable BLVD to ensure reliability of the power supply.
The method of disabling BLVD is:
1. Hardware disabling BLVD: unplug the signal cable from J427 terminal of controller, and tag the BLVD-disabled
label. Refer to
2.4.2 Connecting Signal Cables
for the controller position and interface description.
2. Software disabling BLVD: set
‘BLVD Enable’ parameter through the controller to ‘N’. Refer to
LVD Parameter
in
4.7.2 Battery Setting
for the setting method.
Note
The advantage of enabling BLVD is protecting the batteries from over-discharge when the battery voltage is too low. The
disadvantage of enabling BLVD is that when the battery voltage drops down to a certain value, all the loads (including
non-priority loads and priority loads) will be cut off due to battery disconnection.
The advantage of software disabling BLVD is prolonging the power supply of priority loads. The disadvantage is that
software disabling cannot prevent unwanted power failure due to misoperation or power system failure.
The advantage of hardware disabling BLVD is preventing unwanted power failure due to misoperation or power system
failure, and ensuring the continuity of vital loads’ power supply.
Others
I. Safety
Note
When replacing the power input fuse of the controller and the power distribution unit, you must use the fuse with same
type.
II. Sharp object
Warning
When moving equipment by hand, wear protective gloves to avoid injury by sharp object.
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