VOLTWERK VC 200 Instrucciones De Servicio página 110

2 Safety
AC circuit breaker
LV HRC disconnector
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An AC circuit breaker with isolating properties or a fuse switch with a
fusible cut-out of gG standard must be connected upstream of each
central inverter. Please note:
AC circuit breaker must be adjusted to the rated current of the device.
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If the AC circuit breaker meets the requirements of an AC disconnector,
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check if a further AC disconnector is required.
If the AC circuit breaker meets the requirements for fusing the device,
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do not insert a fuse on the AC side.
When selecting the fuse (LV HRC disconnector) note:
Local directives and regulations.
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The ambient temperature influences the trigger behaviour of the fuse.
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If the rated current on the type plate differs from the rated current for
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the fuse inserts, use a fuse insert with the next highest rated current.
If the LV HRC disconnector meets the requirements of an AC
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disconnector, check if a further AC disconnector is required.
If the LV HRC disconnector meets the requirements for fusing the
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device, do not insert an AC circuit breaker.
If you have any questions regarding the dimensioning of the fuses,
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please contact the fuse manufacturer. Please note:
There are fuses which cannot support the rated current
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continuously.
Level of performance 200 kVA: Maximum 450 A, use type gG.
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Level of performance 300 kVA: Maximum 630 A, use type gG.
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Level of performance 350 kVA: Maximum 722 A, use type gTR or
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gG.
Insulation and earth fault monitoring of the IT grid
The reliability of the IT grid must be guaranteed with insulation and earth
fault monitoring. Monitoring detects an insulation fault or a short to earth
even as it is developing and reports it before a second fault interrupts
operation. Please note:
Only use insulation and earth fault monitoring with unearthed solar
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generators.
Insulation and earth fault monitoring must comply with the local
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regulations and the accident prevention regulations.
Insulation and earth fault monitoring must be suitable for operation in
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mixed networks (AC and DC). Otherwise, incorrect triggering or
incorrect measurements can occur due to the operating behaviour of
the inverter.
Measurement range from approx. 2 kΩ.
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Trigger value 4 kΩ (manufacturer's recommendation). Otherwise,
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device-internal leakage resistances and leakage currents in the solar
generator can result in incorrect triggering.
Operating manual
Transformerless central inverter