Blue Sky SC30 - Manual (Page 11)

Installation and Operation Manual
10
TROUBLESHOOTING GUIDE
SYMPTOM PROBABLE CAUSE ITEMS TO EXAMINE OR CORRECT
Completely dead,
display blank. No battery power.
Display mode set to OFF.
Battery disconnected, overly discharged, or connected reverse polarity. Battery
powers SC30, not PV. Voltage present on the SC30’s battery terminals must be the
same as actual battery voltage within a few 10
ths and at least 9 volts.
Press Display Select to select display mode other than OFF.
Unit will not switch to
Charge ON state. No battery power.
PV disconnected or low in voltage.
PV reverse polarity.
Microprocessor lockup.
Over temperature shutdown.
Battery disconnected, overly discharged, or connected reverse polarity. Battery
powers SC30, not PV. Voltage present on the SC30’s battery terminals must be the
same as actual battery voltage within a few 10
ths and at least 9 volts.
PV voltage when connected to the SC30 must be at least 0.3V greater than battery
voltage for SC30 to switch to Charge On State.
Reverse PV will heat front panel & force all display segments & LED’s ON.
Momentarily remove all power (battery & PV) to re-boot.
Normal operation will resume when the SC30 cools down.
Unit will not stay in a
Charge ON state. Low and changing sun intensity.
PV- connected to BAT- external to
controller.
Normal operation.
PV- & BAT- must be separate for proper operation. External connection prevents
proper operation of current measurement system.
Charge status
indicator ON but no
output charge
current. Battery voltage greater than charge
voltage setpoint.
Battery voltage too low.
Poor connection to the battery.
PV- connected to BAT- external to
controller.
Normal operation. Output is off due to high battery voltage which may be caused by
other charging systems, or immediately following a switch to Float before battery
voltage dropped and settled.
Battery voltage must be at least 9 volts for the SC30 to operate.
Voltage present on the SC30’s battery terminals must be the same as actual battery
voltage within a few 10
ths . Examine connections and fuse & fuse holder.
PV- & BAT- must be separate for proper operation. External connection prevents
proper operation of current measurement system.
Charge OFF at high
ambient temperature. System temporarily shuts down due to
high internal temperature. Improve ventilation or reduce PV power.
Charge current is
lower than expected. Battery is highly charged.
User expectations too high.
Worn out or very dissimilar PV
modules
Low sun intensity
PV- connected to BAT- external to
controller.
Normal operation. Current is intentionally reduced in Absorption & Float to control
battery voltage at setpoint. Maximum available charge current will only be seen when
the SC30 is in Bulk.
Even though the PV’s may be in full sun, clean, and with zero shading it is common to
only see about 75 – 80% of total PV I
MP
. Note that the smallest amount of shade can
cause a large reduction in charge current.
Replace, or use as is.
Atmospheric haze, PV’s dirty or shaded, sun low on horizon, etc.
PV- & BAT- must be separate for proper operation. External connection prevents
proper operation of current measurement system.
System appears to
operate OK, but will
not switch between
Bulk, Absorption &
Float.
Not set for 3-stage charge.
Will not switch out of Bulk and into
Absorption or Float.
Will not switch from Absorption to
Float.
Confirm Float voltage setpoint is not set to OFF.
Available net charge current cannot bring battery voltage up to the desired charge
voltage setpoint. Battery may be too large, PV power too low, and/or loads too high.
PV’s should produce at least 3 amps per 100 amp-hours of battery –and– daily PV
amp-hours produced must be greater than daily load amp-hours consumed.
Battery not fully charged. Unit will not switch to Float until SC30 remains in Absorption
continuously for the Absorption Charge Time period.
Periodic load pulls battery voltage low causing SC30 to re-enter Bulk resetting the
Absorption Charge Timer. Consider using a shorter Absorption Charge Time setting.
Temperature
compensation of
charge voltage does
do not work. Temperature sensor missing.
Wrong temperature sensor.
Temperature sensor failed or installed
reverse polarity.
Install battery temperature sensor BSE p/n 930-0022-20.
Use only BSE battery temperature sensor p/n 930-0022-20.
If sensor is open, short, reverse polarity or missing SC30 will operate as if battery
temperature is 25
°C. Proper sensor voltage when excited by the SC30 will read
approximately 2.98V at 25 °C, changing at +10mV/°C.