26
Section 5.
Tools
5.3 System Operation
(continued)
--User-Configurable Settings
–
(Page Left)
Charge Mode
has 3 settings:
•
Auto
-Automatic Charge mode driven by an algorithm
with critical user-configurable setpoints that are within
this System Operation page, including EQ Voltage, EQ
Charge current, EQ End current, EQ End Time, and FL Voltage.
•
Manual FL
–
this setting forces the Shelf into
Float Charge
mode; DC Bus will stay at the
FL Voltage
setpoint until taken out of this mode of operation.
•
Manual EQ
-
–
this setting forces the Shelf into
EQ Charge
mode; DC Bus will stay at the
EQ Voltage
setpoint until taken out of this mode of operation.
FL Voltage
–set to the battery manufacturer’s recommended Float voltage, which is a value
also stated as Volts-Per-Cell (VPC) recommendations. The 27.0V factory setting is based on a
24V VRLA battery string (12-cell) 2.25 VPC charge-rate.
This FL Voltage setting must always be
at least 0.5V lower than the DC High Voltage Protection setting.
EQ Voltage
–
this is the EQ (Boost) Charge voltage setpoint best determined by the battery
manufacturer datasheet Volts-Per-Cell (VPC) recommendations. The 29.7V factory setting is
based on a 24V VRLA battery string (12-cell) 2.475 VPC charge-rate.
This EQ Voltage setting
must always be at least 0.5V lower than the DC High Voltage Protection setting.
Battery Capacity (Ah)
–
setpoint is based on the rated Ah capacity of a single 24V battery string.
Charge Current Limit
- any charge current up to the maximum safe limit, based on battery
manufacturer maximum charge current recommendations.
BLVD Off
-Voltage (V) setpoint that will turn off the Battery LVD (contactor)
BLVD Control Test
–
allows user to toggle the ON/OFF state of the LVD, for test purposes.
EQ Charge Current
–
In
Auto
Charge mode, this value is the minimum current that will force
boost charge by entering
EQ Charge
(Bus Voltage = EQ Voltage, with Charge Current Limit)
EQ End Current
–
In
Auto
Charge mode, this value is the charge current setting that allows a
transition from Boost Charge back to Float Charge but only after the
EQ End Time
setpoint.
EQ End Time
- In
Auto
Charge mode, this value is the time period that the battery charge
current must stay ≤ EQ Charge to allow
a transition from Boost Charge back to Float Charge.
EQ Period
–
time period between the start of each automatic
EQ Charge
process.
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