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L O A D C O N T R O L
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M O R N I N G S T A R C O R P O R A T I O N
5.0
5.0 Load and Lighting Control
5.1 General Load & Lighting Control Notes
IMPORTANT:
5.1.1 Inductive loads
Do not connect inductive loads such as inverters, motors, pumps,
compressors, generators to the load terminals. Inductive loads can generate
large voltage spikes that may damage the controller’s lightning protection
devices. Connect inductive loads directly to the battery.
If a heavy load must be connected to the TriStar's load terminals e.g. for LVD
purposes, contact your dealer or Morningstar Tech Support for a design
solution.
5.1.2 Parallel TriStars
Two or more TriStars should never be put in parallel for a large load. The
controllers cannot share the load.
5.1.3 Reverse Polarity
If the battery is correctly connected (LEDs are on), the load should be
connected very carefully with regard to polarity (+ / –).
If the polarity is reversed, the controller cannot detect this. There are no
indications.
Loads without polarity will not be affected.
Loads with polarity can be damaged. It is possible that the TriStar will go into
short circuit protection before the load is damaged. If the LEDs indicate a
“short”, be certain to check for both shorts and reversed polarity connections.
If the controller does not go into short circuit protection, the loads with polarity
will be damaged.
CAUTION: Carefully verify the polarity (+ and –) of the load connections
before applying power to the controller.
PRUDENCE : Vérifiez avec précaution la polarité (+ et –) des connexions
de la charge avant de mettre le contrôleur sous tension.
5.2 Load Control Settings
The primary purpose of a low voltage load disconnect function (LVD) is to
protect the system battery from deep discharges that could damage the
battery.
In the Load Control mode, the TriStar provides for seven standard LVD
settings that are selected by the DIP switches. These are described in the
table below. Custom LVD settings are possible using the PC software (see
Section 7.0).
DIP
12V 24V 48V Battery 12V 24V 48V
Switch
LVD
LVD
LVD
SOC%
LVD
R
LVD
R
LVD
R
off-off-off
11.1
22.2
44.4
8
12.6
25.2
50.4
off-off-on
11.3
22.6
45.2
12
12.8
25.6
51.2
off-on-off
11.5
23.0
46.0
18
13.0
26.0
52.0
off-on-on
11.7
23.4
46.8
23
13.2
26.4
52.8
on-off-off
11.9
23.8
47.6
35
13.4
26.8
53.6
on-off-on
12.1
24.2
48.4
55
13.6
27.2
54.4
on-on-off
12.3
24.6
49.2
75
13.8
27.6
55.2
on-on-on
Custom
Custom
Custom
Table 5.1
The table above describes the standard selectable LVD battery voltages for
12, 24 and 48 volt systems. The LVD
R
values are the load reconnect set-
points. The “Battery SOC %” provides a general battery state-of-charge figure
for each LVD setting. The actual battery SOC can vary considerably
depending on the battery condition, discharge rates, and other specifics of the
system.
NOTE: The lowest LVD settings are intended for applications such as
telecom that only disconnect the load as a last resort. These lower LVD
settings will deeply discharge the battery and should not be used for
systems that may go into LVD more than once a year.
REMARQUE : Les réglages les plus bas du disjoncteur basse tension sont
prévus pour les applications comme celles de télécom qui ne
déconnectent la charge qu’en dernier recours. Ces réglages les plus bas
du disjoncteur basse tension déchargent fortement la batterie et ne
doivent pas être utilisés avec les systèmes qui risquent de déclencher le
disjoncteur basse tension plus d’une fois par an.
The LVD values in table 5.1 above are current compensated. Under load, the
battery voltage will be reduced in proportion to the current draw by the load. A
short-term large load could cause a premature LVD without the current
compensation. The LVD values in the table above are adjusted lower per
the following table:
TS-45
TS-60
12V –15 mV per amp
–10 mV per amp
24V –30 mV per amp
–20 mV per amp
48V –60 mV per amp
–40 mV per amp
As an example, consider a 24V system using a TriStar-60 with a 30 amp load.
The LVD will be reduced by 0.02V (per the table above) times 30 amps. This
equals –0.6V. A DIP-switch selected LVD of 23.4V would be reduced to 22.8V
in this example.
Note that the LEDs are linked to the LVD setting, so the LEDs are also current
compensated.
c o n t i n u e d . . .
