Viessmann ESS CHP Especificações descarregar pdf (Página 34)

Subject to changes due to technical improvements ESS Energie Systeme & Service GmbH

34 CHP accessory range – 01/2010

5368 463

6.5.2 Load controller

Article number CHP module type ESS Viessmann

For all CHP module types except EM-18/36 710-00-0053 7411205

Function Load controller to prevent electrical power being fed into the public grid when a CHP module is being

operated in mains parallel mode.

Power modulation:

A value for the power still to be drawn from the public grid can be freely entered.

The CHP module generates power and heat simultaneously. During power modulation there may be

insufcient or excess heat.

With an adjustable start threshold (e.g. load 60 kW

), the CHP module is selected via a zero volt contact.

The module is subsequently regulated to the set minimum load (e.g. 10 kW

), using a default value (0 -

20 mA equates to 50 - 100 % electrical module output).

The digital display shows the current load (e.g. 10 kW

), the actual output demand (e.g. 60 kW

) and the

module default value (e.g. 50 kW

If the load drawn from the grid increases (actual output demand), the module is modulated up to the

maximum output. If the load drawn from the grid drops, the module output is reduced down to the

minimum output (50 %) and shut down at an adjustable stop threshold (e.g. load 30 kW

Please note that values below the minimum output value (50 %) cannot be regulated.

Furthermore, please note that a minimum load drawn from the grid or a minimum control grid feed-in

is always selected. If the module is regulated to exactly zero grid load, a "mains power failure" can no

longer be detected and at "power supply restoration", this would lead to asynchronous control.

Standard delivery • Load controller in separate wall mounted casing

Control panel: 300 x 300 x 210 mm (H/W/D)

IP rating: IP41

Colour: RAL 7035

Max. ambient temperature: 45 °C

Max. relative humidity: 70 %

VDE: 0660/500

Cable entry: either top/bottom right

Door hinges: right

• With the following integral parts:

PLC standard module with digital and analogue I/O module and internal control terminal

Fuse 24 VDC

Isolating amplier for separating the on-site load signal

Interface relay to enable module selection

(Power supply 24 VDC from module control eld)

Control panel complete with all necessary fuses and relays, wired to terminals ready for connection.

The wiring required between control unit and load signal is installed on site.

On-site requirements:

• Load signal - x kW to + y kW equates to 0 - 20 mA

or 4 - 20 mA

or 0 - 10 V

(The values x and y can be freely selected according to on-site conditions or requirements.)

Delivery As loose accessories for on-site installation

Electronics

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