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7a. Installing the power supply
Step 1: Open the inverter wiring box. Disconnect the inverter output conductors from top-side of terminals 1 and 2 by inserting
a ¼" flat screwdriver into the square holes. (The square holes are indicated in Figures 6 and 7.) Lightly press the screwdriver
toward the wire slot until the clamp opens.
Figure 6
Wiring box for PVI-3.0/3.6/3.8/4.2 and PVI-5000/6000
7b. Installing the power supply
Step 2: Push the end caps on the DIN rail to the right. Pop the terminal block 1, 2 and GND off the DIN rail by pulling upwards
from the bottom. Install the 24V power supply on the DIN rail, by using a small screwdriver to pull down on the tab on the
bottom of the power supply. See Figures 8a-8d and 9.
Figure 8a
Figure 8b
Figure 8c
Figure 8d
Note: Once the Grid Connections are done to the power supply, measure the output voltage of the power supply to be 24V. If
not, adjust the screw off the power supply until it reads 24V.
FOLD
8. Wiring the Power Supply inputs from the Grid
PVI-3.0/3.6/3.8/4.2/5000/6000-TL
Step 5: Connect the ground (green) wire from the kit to the ground terminal of the power supply and to the green terminal block.
Connect one black wire between the center position of the first terminal block and terminal "L" on the power supply. Connect
the 2nd black wire between the center position of the 2nd DIN rail terminal block and terminal "N" on the power supply. Confirm
all wires are completely seated. Torque all power supply screws to 4.43 in-lb (0.5 N.m) - 5.31 in-lb (0.6 N.m). Figures 14 and
15 show the two terminal blocks in place and correctly wired. Give all wires a pull test to confirm the connections are solid.
Figure 14
9. Connecting the control wires between RSD(s) and power supply
Step 6: The installer may connect the 24Vdc supply cable (F) to a UL approved "I" or "T" splice connector depending on the number
of SRD boxes or into a UL approved junction box on the roof. Installer is allowed to clip off connectors in order to use the junction box.
Run the 24Vdc wire pair from the splice connector or junction box to the inverter and attach to the 24Vdc power supply. (Note the
power supply terminals accept wire sizes 18 AWG to 16 AWG). Connect the conductors as follows:
Strip 0.3" of insulation from the ends of the wires.
Use a small Philips screwdriver to attach wires to the (+) and (-) outputs of the power supply. Torque all power supply terminal screws
between 4.43 lb.-in (0.5 N•m) and 5.31 lb.-in (0.6 N•m).
The 24Vdc power supply conductors may be routed through the DC conduits to the location where the RSD device is installed near
the PV array or the installer may run these conductors through a separate DC conduit.
Note: 1. The power supply installed in the inverter wiring box is a Class 2 power source. Class 2 circuits are permitted to be reclassified
as Class 1 circuits per NEC 725.130 (A) exception 2. By reclassifying this circuit at Class 1, the 24Vdc conductors may be installed
in the same raceway as the PV conductors as specified in section 725.48(B) (1) of the NEC. Be sure to follow all Class 1 wiring
methods as stated in section 725.49 to ensure compliance. The installer should mark out any reference to 'Class 2.'
2. Placing the 24Vdc power supply conductors in the same EMT conduit as the PV conductors will require use of 18 AWG 600Vdc wire.
10. Multiple-RSD installation
Each 24Vdc power supply has terminals for connecting four RS1-1PN6-MC4 devices or two RS2-2PN6-MC4 devices. Repeat
the wiring directions above to connect a second RSD control circuit to the second output positions on the power supply.
However, each 24Vdc power supply in the kit can power up to six single-output RSDs (ABB P/N: RS1-1PN6-MC4) or three
dual-input RSDs (ABB P/N: RS2-2PN6-MC4). For more than two RSDs, you must use an UL approved "I" or "T" splice or a
UL approved junction box, or equivalent.
Without the approved splices an additional power supply would be required to power more than two RSDs in a single-inverter
system. UNO-7.6/8.6 inverters have sufficient space for additional power supplies. If using PVI-series ABB in-verter, there may
be space for only one power supply on the inverter DIN rail.
Figure 7
Wiring box for UNO-7.6/8.6
Figure 13
UNO-7.6/8.6
Figure15
7c. Installing the power supply
Step 3: Snap the orange cover on one terminal block from the kit, prior to mounting it on the DIN rail. Install both terminal
blocks from the kit on the DIN rail to the right of the power supply. The terminal cover must be on the right-side end. Push
the two new terminal blocks, the terminal cover, terminal block 3 and end caps to the left, up against the 24V power supply.
Figures 10 and 11 show the two new terminal blocks in place.
Figure 10
Wiring box for PVI-3.0/3.6/3.8/4.2 and PVI-5000/6000
7d. Installing the power supply
Step 4: Replace the inverter AC conductors in the top positions of the two, new left-hand terminal blocks by inserting a ¼"
flat screwdriver into the square holes. Insert the wire labeled '1' into terminal 1 and wire labeled '2' into terminal 2. The wires
are shown in Figures 12 and 13. Be sure the wires are completely seated. Give each wire a pull test to confirm the wire is
snugly held in place.
Figure 12
11. Operation of the RSD
Note: To comply with NEC 690.12 rapid shutdown requirements, within the ten-foot perimeter of the PV array, DC voltage
must be reduced to no more than 30Vdc, and power to <240VA, within 30 seconds. The RSD system is activated through a
loss of AC voltage to the inverter. When the loss of AC occurs, the RSD power supply shuts off. This results in opening the
relay contacts of the RSD device and de-energize the system per NEC 690.12 requirements.
12. System testing - required before system commissioning
Testing Rapid Shutdown within the PV system:
Once the PV system has been installed, test the RSD system. The intention of the test is to confirm inverter DC input drops
to less than 30 Vdc in less than 30 seconds after AC is removed. A multimeter will be required to measure the DC voltage.
PPE must be used in all steps while working with this equipment.
1. Before connecting the inverter to the grid, measure the output resistance of the RSD at the inverter input terminals (see
Table 4 for correct values.)
Do NOT energize the system until proper resistance values are
measured.
2. Connect a voltmeter to the inverter DC input voltage at a
convenient location.
3. Reinstall the inverter switchbox cover.
4. Connect the system to the grid by closing a circuit breaker or
circuit disconnect.
5. Begin monitoring the DC input voltage at the input terminals.
Ensure that the proper input voltage is present based on the
PV plant design documentation.
6. Once the inverter is connected to the grid and producing power, remove the grid voltage from the inverter by opening AC
circuit breaker or circuit disconnect and monitor the inverter DC input voltage.
7. Confirm the inverter DC input voltage is below 30Vdc within 30 seconds of grid disconnect by measuring the voltage across
the DC input terminals inside the wiring box.
Testing the PV System only, without Rapidshutdown or to Perform Anti-Islanding Test:
If it is necessary to test the PV system without the rapid shutdown being operational, bypass the rooftop RSD by directly
connecting the PV strings to the corresponding PV array output conductors.
Prior to commissioning the PV system, the PV strings and PV output circuits must be properly reconnected through the RSD,
and the system must be tested as described above.
Rooftop 1
ABB rapid
PV String 1
shutdown
PV output MPPT1
PV String 2
Rooftop 2
ABB rapid
+24V RSD power
shutdown
PV String 3
PV output MPPT2
Contact us
www.abb.com/solarinverters
Figure 11
Wiring box for UNO-7.6/8.6
Figure 13
Table 4: Expected resistance measurements
Number of RSD
Expected resistance value
channels in parallel
1
36kΩ ±5%
2
18kΩ ±5%
3
12kΩ ±5%
4
9kΩ ±5%
The inputs of both rapid shutdown boxes
are rated for 25A which allows for single
or paralleled string to be connected to
Utility
one input. On a 2 rooftop system either
grid
~
version of the Rapid Shutdown box, or
PV system
both, may be used.
disconnect
A system with two or more RSD boxes
will require either a UL approved "T"
connector (available from ABB) or a UL
approved junction box.
BCM.00372.3DG Rev AA
© Copyright 2017 ABB. All Rights Reserved.
Specifications subject to change without notice.
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