Using a PT Controller: Operation/Monitoring
Page 134
©
2017 Sensata Technologies
Power Status:
• Limit: Above VDC
• Limit: Int Hz
• Limit: Int Temp
• MPPT
On
PT Relay Status:
• Disengaged
• Engaged
There are eight different PT Power statuses and two PT Relay statuses that can display (refer also
to Figure 12-5,
and Tables 12-3 and 12-5).
METER: 07B Aux Relay
This read-only menu allows you to view your controller system’s aux relay status. Press and then
rotate the SELECT knob to view the aux relay status for each individual connected PT controller.
METER: 07C PT Volts
This read-only menu shows your controller system’s input voltage from the PV array and the
voltage to the controller’s battery voltage terminals. Press and then rotate the SELECT knob to
view the input from the PV array and voltage to the controller’s battery voltage terminals for each
individual connected PT controller.
Note:
Normally, this voltage is the same as the battery bank voltage as long as there is no voltage
loss in the cables.
METER: 07D Target Volts
When charging, this read-only menu displays the system’s voltage regulation set-point after it
has been compensated based on the battery temperature sensor (BTS) reading shown. Press and
then rotate the SELECT knob to view the voltage regulation set-point (after BTS compensation) for
each individual connected PT controller. The PT controller uses the temperature around the BTS to
determine how much the voltage should decrease or increase from the actual voltage regulation
setting (i.e.,
Absorb Volts
,
Float Volts
, or
EQ Volts
settings). The temperature compensated voltage
regulation set-point will be lower than the actual setting if the temperature shown is >77°F/25°C,
and will be higher than the actual setting if the temperature shown is <77°F/25°C. This may give
the appearance that the batteries are being overcharged when cold and undercharged when hot.
However, this voltage change improves the performance of the batteries in cold weather and
reduces gassing in hot weather.
Note:
The PT controller temperature compensates the battery charging voltage (i.e., target voltage)
down to -4°F/-20°C, but the BTS temperature value displayed on this meter has a low range of
32°F/0°C. Therefore, if the actual BTS temperature is 32°F/0°C or lower, the temperature displayed
is held at the low range of 32°F/0°C, but the target voltage displayed on the
07D Target Volts
meter
will be correct.
Also, the BTS temperature value displayed on this meter is 305°F/152°C if no BTS is detected, and
304°F/151°C 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: 07A 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 To Batt Now
This read-only menu shows your controller system’s real-time current out of the PT controller
system to the battery (amps) and the power out of the PT controller system occurring now
(in Watts). Press and then rotate the SELECT knob to view the real-time current out of the PT
controller to the battery (amps) and the power out of the PT controller occurring now (in Watts)
for each individual connected PT controller.
• No Power Out
• Regulating:
Amps
• Regulating:
VDC
• Unknown Power ##
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