Multi-Stage Charging - Yale 524150797 Maintenance Manual

2200 YRM 2030

MULTI-STAGE CHARGING

There are multiple charging stages for the Q-Series
®
AccuSense Charger.
Depending on the Mode selected, stages are preset
and implementation of each stage will vary from one
mode to the next, dependent on the type of battery in-
tended to be charged.
1. PRE-QUALIFICATION TEST Charge Stage:
Tests battery for sulphation by applying a low
level charge current analyzes voltage, current
values, rates of change to determine if the bat-
tery is ready to transition to the next high
power Bulk Charge Stage.
2. BULK Charge Stage (Constant-Current):
High Power charge, charges at a constant cur-
rent or constant power rate to deliver the 'bulk'
of the charge needed.
Some algorithms employ a 2-step Bulk Charge
rate where a timed 10 to 30 minute period of a
higher current may be measured. This two-step
process helps to break down sulphates
quicker.
Upon completion of this stage, approximately
80% of total charge is delivered to the battery.
The bulk charge is 20A DC RMS ± 10%. Use a
true RMS Amp meter to measure the current.
Figure 7. Battery Charger Diagram
AccuSense
3. ABSORPTION Charge Stage (Constant-Volt-
age):
Charger charges at a constant voltage level to
provide adequate time for the battery plates to
'absorb' the energy delivered. Charge Amper-
age decreases as the energy is absorbed into
the plates.
Termination of this stage occurs when the
charge current has decreased down to a targe-
ted value which is dependent on many factors
such as size, type, age, and chemistry of bat-
tery, or when the stage times out. Upon com-
pletion of this stage, approximately 95% of total
charge is delivered to the battery.
The Absorption Charge Stage can also be ter-
minated based on a timer.
4. TOP-OFF Charge Stage (Finish):
Charger charges at either a constant voltage,
or constant current, or a combination of con-
stant-current / constant voltage to 'Top-Off' the
charge in a battery.
This stage employs timing based on 'timers'
measured and recorded
charge stages, with any combination of dv/dt,
di/dt, dT/dt and maximum voltage.
®
Q-Series Charger
during previous
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