Zumtobel nBOX Serie Puesta En Operación Rápida página 37

9 Checking wiring
To check the correct wiring, measure the resistance and loop resistance on the devices in the nBox. Enter the
measured values in the Actual value column. Also check for external voltages and eliminate these.
Note
i
Carry out the measurement when the nBox system is disconnected from the power.
Measuring resistance
·
nBox S / nBox L
Resistance
L -> PE > 1,000 Ω
N -> PE
< 1,000 Ω
Table 6: Resistance for nBox S or nBox L (power disconnected)
·
Output circuits
Resistance
CH1+ ... CH8+ -> PE > 100 Ω
< 100 Ω
Table 7: Resistance in output circuits (power disconnected)
Measuring loop resistance
·
In the nBox on the MBC module
Note
i
w
For this measurement, short-circuit the system bus for the external device that is furthest away from
the nBox.
Resistance
B1 -> B2 Max. 11 Ω
Table 8: Loop resistance on system bus (power disconnected)
·
nBox MBC (central phase monitor, emergency stop switch)
Resistance
SX+ -> SX- 1,000–1,100 Ω
Table 9: Loop resistance for nBox MBC (power disconnected)
Check wiring: measure resistance and loop resistance
nBox, Quick commissioning 2.0 | 07.2022 | en
Meaning
Wiring is correct
Earth fault in nBox system
Meaning
Wiring is correct
Wiring error
Meaning
Wiring is correct
Meaning
Wiring is correct
Checking wiring
EN
Actual value
Actual value
Actual value
Actual value
Done
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