Models KS 7000E ATS, KS 10000E ATS, KS 7000E-3 ATS and KS 10000E-3 ATS are equipped with internal ATS modules and have some special features in use that must be strictly observed.
Generators with internal ATS are intended as an emergency power source for individual insensitive power consumers or groups of them, whose power supply is permanently provided by the ATS module built into the generator.
The ATS installed in the generator does not allow for a complete house feed. The 230V and 400V power consumers should be supplied separately, as the 400V generators are only of limited use for 230V power consumers.
Recommended connection plan for 230V power consumers authorized for emergency power supply in accordance with the VDN guidelines for the planning, construction, and operation of systems with emergency power generators for 230V generators such as KS 7000E ATS and KS 10000E ATS:
The power supply must be connected using a suitable power cable via a miniature circuit breaker. If necessary, a contact protection device (residual current device) must also be installed. We recommend using a flexible copper cable with a cross-section of 4-6 mm² (2.5-4 mm² for 3-phase models) per wire. The same cross-section must also be used for the connection cable (Schuko or CEE socket, depending on the load).
It is essential to pay attention to the maximum permissible forward current for each model.
The maximum permissible current through the CEE socket (including reactive current) is 25A (KS 7000E ATS) or 32A (KS 10000E ATS) and for 3-phase 400V models 3 x 8A (KS 7000E-3 ATS) or 3 x 12A (KS 10000E-3 ATS).
Powerful 230V power consumers such as electric stoves, instantaneous water heaters, saunas, etc., which are connected to three phases of the external power grid for load distribution during normal operation, must not be permanently supplied by the generator ATS, but may only be switched on via an external load transfer switch.
Although a 3-phase electric stove is connected to three phases, it is typically a 230V power consumer, with its heating elements divided into three groups for load distribution. It can be powered by a single 230V phase from the generator. However, not all cooking zones and the oven can be activated simultaneously to avoid overloading the neutral wire to the electric stove from the distribution box.
Three-phase consumers must not be connected, as they require 3 x 230V with 120° phase shift.
Recommended connection plan for permanently emergency power-entitled and switchable 230V power consumers:
For example, the circuit could run power consumers such as lights permanently through the generator ATS, while connecting other emergency power consumers through the additional load transfer switch. This relieves the strain on the cable to the generator and generator ATS during normal operation and is especially important for safe operation if the generator is to be installed at a distance.
To protect sensitive electronic power consumers, we recommend always having a resistive load connected in the active circuit when operating the generator (at least 100W), which can dampen transient processes caused by peak current consumption by electronic power consumers.
Voltage (yellow) and current (green) of a conventional generator with AVR under electronic load without and with balancing load (100W light bulb):
You can see that the disturbing harmonics marked with the red arrows in the left image are much smaller in the right image and most electronic modules then function without problems.
Please make sure that the neutral conductor (star point) of the generator windings is NOT connected to the generator housing and PE conductor in the sockets.
The L and N connections from the public grid are routed from ATS to the output sockets and the output neutral conductor is thus earthed in the TN and TT external grid.
In the event of a power failure, the output (the two sockets) is switched to the generator windings, and the public grid is safely disconnected at all poles (including the neutral conductor). The neutral conductor's grounding by the public grid (if present) is thus removed.
If you still need a grounded neutral conductor (TN network), you must firmly connect the neutral conductor (star point) under the cover of the alternator to the housing of the alternator (PE) when installing the generator (bridge).
Once the jumper between N and PE is installed, the generator must no longer be operated without grounding. The generator is grounded by connecting the ground screw on the generator with a 6-10 mm² copper cable to the main grounding bar in the house, or by using the generator's own grounding system.
It is essential to check the routing of L and N to the sockets. The miniature circuit breakers installed in the generator may only interrupt L conductors in the TN network. The pin assignment in the polarity-protected CEE socket must be checked.
The KS 7000E-3 ATS and KS 10000E-3 ATS models are designed as emergency power sources for 400V three-phase consumers that load all three phases symmetrically. The maximum permissible unbalanced load for these models is 20%; otherwise, the voltage per phase of 230V ± 10% can no longer be guaranteed. A complete household supply is not possible with these models!
Recommended connection plan for 400V three-phase consumers (motors, pumps, etc.) entitled to emergency power in accordance with the VDN guideline for the planning, construction and operation of systems with emergency power generators:
The miniature circuit breaker in the generator only protects the connecting cable from the generator to the power consumers. It is absolutely necessary to protect the supply cable to the generator on the connection side (see wiring diagram) with a miniature circuit breaker. For the 3-phase models KS 7000E-3 ATS and KS 10000E-3 ATS, this should be 3 x 10A or 3 x 16A. If necessary, a contact protection device (residual current circuit breaker) must also be installed.
The Schuko socket on the KS 7000E-3 ATS and KS 10000E-3 ATS models is connected in parallel to a phase in the CEE 400V 16A socket and may only be loaded moderately (up to 200-300W) with insensitive power consumers. Higher loads (up to 20% of the generator's total power) are only possible if no power consumers are connected to the CEE 400V 16A socket.
CAUTION DANGER! Continuous operation with high currents and a connecting cable with too small a cross-section and poor contact at the connectors can lead to fire!
In the event of a power failure, the output (the two sockets) is switched to the generator's windings, and the external power grid is safely disconnected across all poles (including the neutral conductor). This eliminates the grounding of the neutral conductor by the public power grid (if present).
If you still need a grounded neutral conductor (TN network), you must firmly connect the neutral conductor (star point) under the cover of the alternator to the housing of the alternator (PE) when installing the generator (bridge).
IMPORTANT: The selection of a suitable generator should be done carefully, as an unsuitable generator can not only jeopardize the intended use, but can also damage the equipment and pose a risk itself. Purely resistive power consumers do not pose a problem for all types of generators. For equipment with motors, the required starting power must be considered. Non-linear power consumers, and especially electronic devices without built-in power factor correction, require a solution tailored precisely to the specific application.
Disclaimer:
This manual is intended only as a guide, is illustrative, and must be adapted to the specific circumstances and conditions on site during installation. The installation itself must be carried out in compliance with all standards and regulations. We assume no responsibility for incorrect installations and their consequences.
