Bridging Power Outages; Can Distributor - VOLTWERK SmartConnect 8 Instrucciones De Servicio

Switch-on block
3.3.7
3.3.8
CANopen
SmartConnect
Operating manual
If no auxiliary voltage is present at the signal input for the external string
switch-off system, all strings of the SmartConnect are separated and
switching on is blocked. All LED string status indicators flash red.
When the device is first delivered, the signal input for the external string
switch-off system is deactivated. During operation, a permanent auxiliary
voltage is present at the signal input, so that the relay module can activate
the connected strings.
If you want to use the signal input for an external string switch-off system,
the connection cable of the relay module must
be disconnected from the series terminals of the auxiliary power supply
|
(see Fig. 3.1, page 13, item (8)) and
connected to the free series terminals for the external string switch-off
|
system (see Fig. 3.1, page 13, item (7)).

Bridging power outages

When the relays are activated, the device can bridge the outage of the
auxiliary voltage supply for up to150 ms. During this bridging time, the
relays do not drop out, and the central inverter remains connected to the
solar generator. This means that SmartConnect can be installed in systems
that are to be operated in compliance with the BDEW (German Energy and
Water Association) guideline "Generator systems in the medium voltage
grid" (status July 2008).
If longer bridging times are required, an uninterruptible power supply
(USP) must be used. Note the following:
At the time of switching on, the relays require a power of up to 80 VA.
|

CAN distributor

Using the Conergy or Voltwerk monitoring systems, you can also monitor
individual strings. To enable this, the SmartConnect must be connected to
the CAN distributor (see Fig. 3.1, page 13, item (10)). The CAN distributor
transfers the determined measurement values for each input from the
SmartConnect to the monitoring unit. If you are using Conergy or Voltwerk
2-axis tracking systems, the CAN distributor also transfers information to
and from the motor control systems. To use motor control systems you will
need a power supply to supply the motor control systems with the
necessary auxiliary voltage(see Chapter 3.4, page 20).
To enable communication between the monitoring system and the system
components, the manufacturer uses a CANopen protocol.
The CAN bus requires a terminated start and a terminated end.
Termination is achieved by terminating resistors (R = 120. This prevents
signal reflections at the end of the cable. Reflected data signals
superimpose the data signal, causing interference.
To guarantee uninterrupted communication:
Maximum length of CAN bus: 250 m.
|
CAN cable: 2 strands for CAN H and CAN L, twisted together.
|
Shielded CAN cable.
|
If you are using Conergy or Voltwerk 2-axis tracking systems, the external
sleeve must contain 2 additional strands for the 24V auxiliary voltage
supply of the motor control system.
3 Technical description
17