Sun Pumps SCB-10-150-120 BL - Manual (Page 7)

3.4 Wiring
Prior to connecting any wires to the controller, be sure you have a system wiring diagram to use as a reference
(see figure 2). Guessing at polarity and connection points is not worth the risk of potential product damage
and/or personal injury.
Ensure the wire sizes are of adequate diameter (gauge) to minimize voltage drop. Please refer to a DC voltage
loss table or call your SunPumps dealer for assistance. Wire gauge being too small will cause excessive voltage
losses to the motor and will reduce the flow rate of the pump.
All other system equipment should be installed before proceeding with wiring the controller. Double check
polarity and wire termination tightness before powering up the system.
CAUTION: Photovoltaic panels produce DC electricity when exposed to sunlight. Cover the panels with
a blanket or with a non-opaque material before wiring. Install a disconnect switch between the solar
modules and the controller.
1. After mounting the controller, switch the controller to the OFF position.
2. If you are using a remote switch, like a float switch, set dip switch 1 to the correct position for the type of
switch being used. (“Normally Open” or “Normally Closed”.) If you are not using a remote switch leave
switch 1 off.
3. Verify all remaining dip switches are off at this time.
4. Connect ground rod conductor to the controller chassis ground block.
5. Connect solar module frame ground conductor to controller chassis ground block.
6. Connect the green pump ground conductor to controller chassis ground block.
7. Connect pump motor leads to the corresponding “Pump Motor” terminals on the controller. Red to “Red”,
yellow to “Yellow” and black to “Black”.
8. Verify that the disconnect switch is in the off position. Connect the DC source supply negative (-), the
black conductor, to one of the controller terminals labeled “Negative” on the “Solar Array Input”. (NOTE:
The power should be connected to a disconnect and it should be in the OFF position before connecting
power to the controller).
9. Connect the DC source supply positive (+), the red conductor, to one of the controller terminals labeled
“Positive” on the “Solar Array Input”. (NOTE: The power should be connected to a disconnect and it
should be in the OFF position before connecting power to the controller).
10. Refer to the next section for “Remote Switch” connections and “Adjustment Procedures” for
configuration, if applicable. Sensor type low water cutoff is supported by the controller but not for booster
pumps at this time. If you would like to use one contact Sunpumps for assistance.
11. At this point, all system components are installed and wired, double check conductor polarities, wire
termination tightness and controller configuration. With a DC volt meter check the array open circuit
voltage (Voc) on the array side of the disconnect switch and the module polarity. Record the Voc for
future reference. You may do this on the Before Calling Sun Pumps Worksheet near the end of this
manual. Check this voltage reading against the “Voc” range for your specific system in the chart below.
(Figure 3)
12. After you have verified the voltage and polarity, switch the disconnect switch on - if the polarity is correct
the first LED light will be on.
13. Turn the “On/Off “switch to the ON position. The system should be operational. If the system does not
start and turns on any error lights or gives you an error message, proceed to the troubleshooting guide.