instagrid ONE max, User Manual

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3. SAFETY CONSIDERATIONS WHEN OPERATING THE INSTAGRID ONE MAX
3.1 Passive protection at the outlet / IT network
When connecting a load to the instagrid ONE max, a low-voltage network is established,
during the operation of which statutory regulations must be observed. It is the user's
responsibility to research and apply the locally applicable regulations – instagrid assumes no
liability in this regard.
The design of the instagrid ONE max ensures galvanic separation (isolation) between the
charging inlet [8] and housing [10] , the outlet [4 | 9] and housing, as well as between the
charging inlet and outlet. As a result, both the requirements placed on a protection class II
device are met and the feature of protective separation between inlet and outlet is
implemented. This means the outlet has no direct earth connection and is considered a special
safety feature, because in the event of an (individual) insulation fault, no shock current can
flow.
Such a network is referred to as an IT (isolé-terre) network. The operation of protection class I
loads on the instagrid ONE max is absolutely possible. The equipotential bonding of the two
outlets [4 | 9] is ensured through the design.
3.2 Active protection at the outlet
The outlet of the instagrid ONE max is protected from overload by several independently
overlapping mechanisms:
• Energy content – due to the limited energy content of the integrated storage unit,
continuous current drain is not possible. The rated current of 16 A can be drained for a
maximum of 35 minutes; at 20 A for 27.5 minutes.
• Thermally induced shutdown – the internal temperature of the instagrid ONE max is
monitored continuously during operation. Exceeding the fixed limit values leads to
a shutdown of the instagrid ONE max; see [section 6.1.2] . The time after which the
shutdown is triggered varies depending on ambient temperature and load current. At 25°C
and 16 A, a complete discharge of the instagrid ONE max (100% -> 0%) is possible without
triggering a shutdown.
• Internal resistance – the internal resistance of the instagrid ONE max limits the possible
short-circuit current to values less than 500 A (peak).
• Electronic fuse – during operation, the instagrid ONE max continuously measures the
outlet current actually flowing and calculates a temporal evaluation of the measured values.
Exceeding the fixed limit values leads to a shutdown of the instagrid ONE max; see [section
6.1.1] . The current/time characteristic resulting from the electronic fuse alone is within the
range that is typical for "B16"-type circuit breakers.
Furthermore, by means of a similarly redundantly active concept, special characteristics of the
output voltage are continuously monitored; e.g.:
• Frequency
• RMS voltage
• Peak voltage
• DC offset
3.3 Additional measures for increasing user safety
As shown in [section 3.1] and [section 3.2] , operation of a load on the instagrid ONE max
is accompanied by a high degree of electrical safety for the user. However, in special cases,
further increasing the scope of protective measures may be necessary. The following measures
are advised for this purpose:
• Use of RCDs:
If more than one load is connected simultaneously to the instagrid ONE max (e.g. via a
power strip), then connecting an RCD (Residual Current Device) upstream for each load is
recommended.