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©
2014 Magnum Energy, Inc
.
Using a PT Controller: Operation/Monitoring
Note:
The PT controller temperature compensates the battery charging voltage (i.e., target volt-
age) down to -20°C (-4°F), but the BTS temperature value displayed on this meter has a low
range of 0°C (32°F). Therefore, if the actual BTS temperature is 0°C (32°F) or lower, the tem-
perature displayed is held at the low range of 0°C (32°F), but the target voltage displayed on the
07D Target Volts
meter will be correct.
Also, the BTS temperature value displayed on this meter is 152°C (305°F) if no BTS is detected,
and 151°C (304°F) if a shorted BTS is detected; in either of these situations (open or shorted
BTS), no temperature compensation is applied to the battery charging voltage.
Note:
If using
SETUP: 06A Battery Type: CC/CV
, and
CV Chg Done Time
(or
Amps
) is selected,
once the charger
fi
nishes the Constant Voltage (CV) charge, the charger goes silent (i.e., not
actively charging). After the PT controller goes silent, this menu displays a voltage regulation set-
point that is just above the inverter’s LBCO level. This voltage regulation set-point allows the PT
controller to use as much PV current as possible to ensure the battery voltage—at the inverter’s
terminals—stays above the inverter’s LBCO set-point to prevent the inverter from shutting down.
Info:
The battery temperature reading is from the BTS connected to the networked
Magnum inverter. However, if a BTS is not connected to the inverter, then this display
uses the temperature readings from the BTS that is connected to the PT controller.
METER: 07E Bat Amps-PT
This read-only menu displays the real-time current out of the PT controller to the battery.
METER: 07F Power to Bat
This read-only menu displays three separate menus to show power out of the PT controller:
• Now:
This display shows the power out of the PT controller occurring now (in Watts).
• Life:
This display shows the total power out of the controller since it was installed (shown in
Megawatt-hours or MWh). To reset this display, access the
Reset
menu, then press and hold
the SELECT knob for approximately 5 seconds. Once the
Reset
meter is cleared, return to the
Life
menu, and then press and hold the SELECT knob approximately 10 seconds to clear the
Life
meter. This meter value has a maximum range of 655.36 MWh (.01 MWh resolution).
Info:
The
Life
menu may be reset if the PT controller changes ownership, or if the user
purchases a new array and wants to only monitor lifetime power out of the PT controller
to the new array.
• Reset:
This display shows the total power out of the controller since the last time it was reset
(shown in Kilowatt-hours or KWH). To reset this display, press and hold the SELECT knob for
5 seconds. This meter value has a maximum range of 6553.6 KWH (0.1 KWH resolution).
METER: 07G Ground Fault
This read-only menu displays the real-time measurement of the controller’s ground fault current.
Note:
This meter can be monitored to give an indication of developing ground faults.
METER: 07H PT Data
This menu enables you to access the PT Data matrix (see Figure 10-6). The PT Data feature
uses the ME-ARC’s internal clock to capture daily PT data events (see the list of data events
on the next page). Each separate data capture includes PT data from a designated time period
(12:00AM-11:59PM each day). The PT data summary for each time period is displayed in reverse
chronological order (i.e.,
fi
rst today’s data, then yesterday’s data, and so on up to 255 days prior
to today). Figure 10-6 also provides an example of how to navigate the PT Data matrix.
Note:
If there is no PT data, then “
No Data Recorded
” displays on the ME-ARC when you select
this menu. PT data is continually updated for the current day (i.e., Today’s data).
Info:
Press and hold the SELECT knob for 3 seconds to return to the
07H PT Data
main
menu from any screen within the PT Data matrix.
