10
Installing DC Input Power Cables
4.5
Selecting DC Input Terminals
1. Use the Amphenol Helios H4 PV connectors provided with the SUN2000. If the terminals are
lost or damaged, purchase the PV connectors of the same model. The device damaged caused
by incompatible PV connectors is not covered under any warranty or service agreement.
2. The metal contacts supplied with the DC connectors are either cold forming contacts or
stamping forming contacts. Crimp the metal cold forming contacts using crimping tool
UTXTC0005 (Amphenol, recommended) or H4TC0001 (Amphenol). Crimp the metal stamping
forming contacts using crimping tool H4TC0003 (Amphenol, recommended) or H4TC0002
(Amphenol). Choose the crimping tools that fit the metal contacts.
3. Before connecting DC input power cables, label the cable polarities to ensure correct cable
connections. If the cables are connected incorrectly, the SUN2000 may be damaged.
4. Insert the crimped metal terminals of the positive and negative power cables into the
appropriate positive and negative connectors. Then pull the DC input power cables to ensure
that they are connected securely.
5. Connect the positive and negative connectors to the appropriate positive and negative DC
input terminals. Then pull the DC input power cables to ensure that they are connected
securely.
6. If polarity of the DC input power cable is reversed and the DC switch is ON, do not turn off the
DC switch immediately or unplug positive and negative connectors. The device may be
damaged if you do not follow the instruction. The caused equipment damage is beyond the
warranty scope. Wait until the solar irradiance declines and the PV string current reduces to
below 0.5 A, and then turn off the two DC switches and remove the positive and negative
connectors. Correct the string polarity before reconnecting the string to the SUN2000.
The SUN2000 provides two DC switches, named as DC SWITCH 1 and DC SWITCH 2. DC
SWITCH 1 controls the 1st to 6th sets of DC input terminals, whereas DC SWITCH 2 controls the
7th to 12th sets of DC input terminals.
Select DC input terminals according to the following rules:
1. Evenly distribute DC input power cables on the DC input terminals controlled by the two DC
switches.
2. Maximize the number of connected MPPT circuits.
Ensure that the PV module output is well insulated to ground.
5. Tighten the thread-lock sealing nut.
6. Clear debris from the maintenance compartment.
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