Rev 6.3.0 12.09.16
PL Reference Manual
20
SET/REG/TCMP Selection Summary:
TCMP Function
Data Source
0
-5mV°C linear
auto sense
(default)
General Purpose -
use this if in doubt
1
gentle curve
auto sense
BP Solar Block
2
steeper curve
auto sense
Sonnenshein Dry Fit
3
limited range
curve
auto sense
Absolyte battery
4
-5mV°C linear
non auto sense
General Purpose -
use this if in doubt
5
gentle curve
non auto sense
BP Solar Block
6
steeper curve
non auto sense
Sonnenshein Dry Fit
7
limited range
curve
non auto sense
Absolyte battery
8
No temperature
sensor (disable)
(Failsafe: if short
across T- T+ inputs)
Note
: Without temp sensor fitted (or if TCMP=8),
the PL will display 0°C.
7
Timers
:
The HYST value is also used to start and stop
the timers associated with the different regulator
charging states (Boost, Equalise, and Absorption).
Example:
When the PL changes to the Absorption state,
an internal timer is started to monitor how long
the regulator has been in Absorption. If however
the battery voltage falls lower than ABSV - HYST
this timer is stopped, and starts again when the
battery voltage rises above ABSV - HYST. This
ensures that the regulator holds the system in
the required state for the correct programmed
time and doesn’t continue to the next charging
stage until this time has elapsed.
Note
: An exception to this is the Equalise State,
which will terminate after 4 days if unable to
complete the full specified time period.
7.4.2 Charge Current Limit
The PL has a built-in charge current limit. If the
charge current exceeds the CHRG setting, the
PL will reduce the duty cycle to limit the average
charge current.
This allows the PL to protect itself from
overheating due to excessive charge current. The
maximum charge current can also be limited for
small batteries where the full array current might
be too much for the battery. This is useful for
systems, which are marginal in winter, but have too
much charge current for the battery in summer.
It can also be useful where there is an initial
ageing effect in the first few months of the life
of the module. For example, with amorphous
modules the initial current may be more than
the charge current rating of the PL. Making use
of this feature, you can install panels with the full
rating calculated after the initial drop off.
7.4.3 TCMP
(Temperature compensation)
(Default=0, Adjustable in Program 4 only)
A temperature sensor is available which allows
the PL to adjust its regulation voltage settings to
compensate for variations in battery temperature.
The setting TCMP is used to select a
temperature profile, which determines how this
compensation is achieved.
The PL can automatically sense the presence of
a temperature sensor if one of the auto-sense
profiles is selected. If operation at temperatures
near zero is common, it is better to use the non
auto sense profile (TCMP=4-7).
Fig. 7.4.3B shows the temperature compensation
curves for each TCMP setting. Consult your
battery manufacturer for correct compensation
for the battery used.
