Product Manual

44
DIVERSION CHARGE CONTROL
45
MORNINGSTAR CORPORATION
6.0
The minimum diversion load would be the source output (35A) times the
voltage (30V). This would require a 1,050 watt heating element rated at 30 volts. Or if a
2,000W heater element rated for 120 volts is used, 9 heater elements will be required
to draw the required minimum diversion load at 30 volts.
6.5 NEC Requirements
To comply with NEC 690.72 (B), the following requirements will apply when
the TriStar is being used as a diversion charge controller in a photovoltaic
system.
6.5.1 Second Independent Means
If the TriStar is the only means of regulating the battery charging in a diversion
charging mode, then a second independent means to prevent overcharging the
battery must be added to the system. The second means can be another TriStar, or
a different means of regulating the charging.
6.5.2 150 Percent Rating
The current rating of the diversion load must be at least 150% of the TriStar source
current rating.
Refer to Section 6.2 (Diversion Current Rating). The maximum allowable
current ratings for both TriStar versions are summarized below:
Max. Input Current Max. Diversion Load Rating
TS-45 30 A 45 A
TS-60 40 A 60 A
CAUTION: The NEC requirement that the diversion load must be sized at least 150%
of the controller rating does NOT mean the diversion load can exceed the
maximum current rating of the TriStar. NEVER size a diversion load that can draw
more than the 45 amps or 60 amps maximum rating of the TriStar controllers.
PRUDENCE : L’obligation de la CNE indiquant que la charge de diversion doit être
150 % plus grande que la puissance nominale du contrôleur NE signifie PAS que la
charge de diversion peut dépasser l’intensité maximum du TriStar. Ne
dimensionnez JAMAIS une charge de diversion qui peut appeler plus de 45 A ou
l’intensité maximum de 60 A des contrôleurs TriStar.
6.6 Additional Information
Visit Morningstar’s website (www.morningstarcorp.com) for additional
diversion charge control information. The website provides expand ed
technical support for more complex diversion load systems.
continued...
7.0 Custom Settings with PC Software
An RS-232 connection between the TriStar and an external personal com-
puter (PC) allows many setpoints and operating parameters to be easily
adjusted. The adjustments can be simply a small change to one setpoint,
or could include extensive changes for a fully customized battery charging
or load control program.
CAUTION: Only qualified service personnel should change operating parameters with
the PC software. There are minimal safeguards to protect from mistakes. Morningstar
is not responsible for any damage resulting from custom settings.
PRUDENCE : Seul le personnel d’entretien qualifié doit modifier les paramètres de
fonctionnement avec le logiciel sur ordinateur. Des protections minimales
protègent contre les erreurs. Morningstar n’est pas responsable des dommages
résultants de réglages personnalisés.
Consult Morningstar’s website for the latest TriStar PC software and instructions.
7.1 Connection to a Computer
An RS-232 cable with DB9 connectors (9 pins in 2 rows) will be required.
If the computer will be used to change battery charging or load control
setpoints, verify that DIP switches 4, 5, 6 are in the custom position (On,
On, On) before connecting the TriStar to a computer. The custom position
is required to change setpoints.
See Section 2.3 - Step 3. Disconnect power
before changing DIP switches.
7.2 Using the PC Software
Download the TriStar PC software from Morningstar’s website. Follow the
instructions on the website for installing the software on your computer.
Open the TriStar PC software. This software will make the connection with the
TriStar via the RS-232 cable. The TriStar must be powered by the battery or a
power supply to complete the connection. If there is a conflict between the
TriStar and PC comm ports, the software will provide instructions to resolve
the problem.