Phoenix Contact SCK-M-U-1500V Handleiding (128 Pagina's)

Handleiding

Troubleshooting

105608_en_02 PHOENIX CONTACT 77

Table 10-9 Scenario 8: SCK-M-I-8S-20A

Device/error description Status register LED indicator

SCK-M-I-8S-20A (2903241)

The current values of the strings are all displayed

as reverse currents (-1.5 A).

No entry POWER LED:

ON

Cause

The current measuring module has been installed incorrectly. Current measurement is

dependent on the current direction.

Measures

1. Rotate the module by 180° along the longitudinal axis and install. Route the string ca-

bles from the other side through the holes in the device (see Section “Installing the

SCK-M-I-xx current measuring modules” on page 54). The current direction is indi-

cated on the module with an arrow.

Table 10-10 Scenario 9: SCK-M-I-8S-20A

Device/error description Status register LED indicator

SCK-M-I-8S-20A (2903241)

The current values do not correspond.

No entry POWER LED:

ON

Cause

– Data transmission is disrupted between the measuring and communication modules

and causes incorrect values in the current value registers.

– The measuring channels were magnetized.

Measures

1. In the case of incorrect transmission-related values, proceed as described in Scenar-

io 3 in Table 10-4 on page 75.

2. In the case of permanently altered measured values, check whether a current value

is also present in defined “zero-current situations” (e.g., at night). If this is the case,

an offset has been caused by magnetization. Proceed as described in Section “Sys-

tem calibration” on page 67.

Note: Corresponding tests on the devices have shown that the components used are

very resistant to magnetization. Magnetization therefore occurs very rarely. Neverthe-

less, it can be caused by multiple rising high current edges in the µs range, for example.

These edges are not usually present in photovoltaic systems.

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