Verify Station Wiring and Voltage

To verify the station wiring, voltage readings and connection, follow these steps:

Tools Needed

	Needle Nose Pliers		T-25 Security Torx
	Solenoid Voltage Meter (Wiggy)		Digital Multi-Meter (DMM)
	Alligator clip leads or pass-through leads (optional)		Power share jumper* NOTE: * indicates that the power share jumper is not required for all stations
	Wire stripper

Station Wiring Checks

1. With the station powered on:

   Make note if the station shows as power shared under the station name in the upper middle of the display screen.

   Power sharing	No Power sharing

2. Remove the handles from the holsters.

   • This can be done with a local card tap if the station is sufficiently operational.
   • You can also have the holsters released remotely if that's possible.
   • If neither of the above options are possible, you can manually release the holster catches with a paper clip, zip tie, or coffee stirrer.
   • If necessary, contact ChargePoint's channel support group at 1-877-850-4562 for a walkthrough of the process.

3. Remove the rubber stoppers if present (the needle nose pliers are useful for this). Loosen (do not remove entirely) the security screws using the T-25 Security Torx.

4. Lift the head unit and insert the T-25 through the hole on the right side of the head unit.

   If there is a label applied to the black plastic cover of the power plate, make note of what it says. It may note that:

   • Power sharing jumpers are installed

     Or

   • Power select options are in use to limit total station current for the circuit.

5. At the bottom of the now exposed power plate, locate the black plastic tab.

6. Push this tab back and lift the black cover to expose the wiring block.

   

Verifying Voltages

Once proper wire placement has been verified, you need to check the voltages and impedances using a Digital multimeter (DMM) in parallel with a Solenoid voltage meter (wiggy).

Since digital meters (DMM) are high impedance devices, the amount of current that flows through the circuit while testing voltage with one is negligible.

1. Test each wire relative to each other wire in the block, phase to phase, and phase to ground:
   

   1. First, by connecting the DMM by itself and noting the voltage.

   2. Next, by adding the wiggy in parallel and noting the voltage.while there is current flowing (using the alligator clips or pass through leads, if available).

2. Use the Test probe holes that are present behind the plastic latches of the wiring block

   Readings with and without the wiggy in parallel should be near 208 V or 240 V (Bonded Neutral Wye or Split Phase) phase to phase and 120 V phase to ground.

   • A significant deviation from these values can denote a wiring problem or unsupported supply type (refer to the CT4000 Installation Guide).
   • A significant deviation from these values only with the wiggy in parallel would indicate an unexpected impedance in the system. This includes any of the following:
     • A possibly worn or damaged beaker (or, pole within that breaker)
     • Corrosion or insufficient bonding of the breaker to the bus bar or the breaker leads
     • Insufficient bonding of neutral to ground at the panel

Expected Voltage Readings

The following table lists the expected input voltage measurements (with or without the wiggy in parallel)

Expected Input Voltage Measurements

Measure Between	Volts (Nominal)
L1R – L2R	208/240
L1L – L2L	208/240
L1R – GND Ground	120
L2R – GND Ground	120
L1L – GND Ground	120
L2L – GND Ground	120
The Line to Ground Maximum Voltage must never exceed 132 V.

Voltage Readings (with the DMM alone)

Voltage Readings

Connection Points (Measure Between)	Results: Volts (Nominal)
L1R – L2R
L1L – L2L
L1R – GND Ground
L2R – GND Ground
L1L – GND Ground
L2L – GND Ground

Voltage Readings (with the DMM in parallel with the Solenoid Voltage Meter)

Voltge Readings

	Results: Volts (Nominal)
L1R – L2R
L1L – L2L
L1R – GND Ground
L2R – GND Ground
L1L – GND Ground
L2L – GND Ground

Verifying Connections

1. Inspect the topmost slots of the leftmost and rightmost pairs of wiring blocks and note if power share jumpers are installed.

   If these jumpers are installed and the station did not show power sharing as enabled on the screen, contact ChargePoint's Support group to enable the power sharing option in the software.

2. Inspect the leads going into the wiring block - these should be 6 or 8 gauge copper, stripped half an inch, and fully seated.

3. Inspect the latches for the wiring block - all should be snapped fully down (vertical).

4. If a station is wired for single port or has power share jumpers installed:

   1. The hot wires from a single 240 V or 40 A Double Pole breaker should be connected to the #2 and #5 position (right side of each outer pair)

      
      

   2. The neutral wire (grounded/earth bonded at the panel) should be connected to the #3 (center) position.

      

5. If a station is wired for dual port use and does not have power share jumpers installed:

   1. The hot leads from one 240 V or 40 A Double Pole breaker should be connected to the #2 and #5 position (right side of each outer pair)

      
      

   2. The hot leads from the other 240 V or 40 A Double Pole breaker should be connected to the #1 and #4 position (left side of each outer pair)

      

   3. The neutral wire (grounded/earth bonded at the panel) should be connected to the #3 (center) position.

      

      To ensure that breakers and phases have not been crossed, it is best to verify each hot wire to ground with only one breaker on, and then again with only the other breaker on.

   
   

   4. Ensure that there is proper earth connection at the main transformer side also. The Neutral and Chassis Ground should be bonded in the main transformer as shown below:

   
   
   

Power On the Station

As you had powered off the station to perform the physical checks, you need to also do these steps:

1. Power the station back on.
   
   

2. Put the head unit back in place.

3. Lock it in.

4. Confirm that there are no faults on the display.