Eliwell FREE Panel EVP 3300/C, Installation Manual

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3 ELECTRICAL CONNECTIONS
3.1 General warnings
Before proceeding with any operation, make sure the device is connected to a suitable external transformer . The
following rules must be followed when connecting cards to each other and to the application:

Loads that exceed the maximum limits stated in this manual must not be applied to outputs.
 When connecting loads, follow the circuit diagrams carefully.

To avoid unwanted couplings, wire all SELV (safety extra voltage) users separately from high voltage
users.
IMPORTANT!
Make sure the appliance is switched off before working on electrical connections . Operations must be carried out
by skilled personnel. To ensure proper connections , comply with the following:

Power supplies other than those specified can seriously damage the system.
 Select cables of suitable section for the terminals used

Separate the cables of probes and digital inputs from inductive loads and high voltage connections to prevent
any electromagnetic interference. Do not place probe signal leads near other electrical equipment (switches,
meters, etc.)
 Make connections as short as possible and do not wind them around electrically connected parts.

To avoid electrostatic discharges, do not touch the electronic components on printed circuit boards.
 The device must be connected to a suitable transformer that complies with the specifications indicated in the
Technical Data chapter.
3.1.1 Power supply
Important!
Make sure that the power supply is of the correct voltage for the instrument.
3.1.2 Analogue Inputs-Probes
Probes have no connection polarity and can be extended using a normal two core cable (note that the extension of the
probes influences the electromagnetic compatibility (EMC) of the instrument: take great care with the wiring).
Important!
Pressure probes have a specific connection polarity, which must be observed.
Signal leads (temperature/ pressure probes , digital inputs, RS-485/ CAN -BUS serials and the electronic supply) must be
routed separately from power cables.
Use probes supplied by Eliwell. Contact Eliwell sales department for parts availability.
3.1.3 Serial connections
 On-board CAN as standard

On-board RS485 as standard
 On-board ETHERNET serial as standard
Pay special attention when connecting serial lines: Do not connect instruments that communicate using RS485 serial to
CAN terminals, or CAN instruments to RS485 terminals.
CAN
NOTE 1

Use a shielded and " twisted pair " cable with two 0.5mm
2
conductors, plus braiding (ideally Belden cable model
3105A (characteristic impedance 120 Ohms) with PVC sleeve, 2 conductors plus braid, 22 AWG, nominal capacity
between conductors 36pF/m, nominal capacity between conductor and shielding 68pF/m).
 Always follow regulations applicable to the routing and connection of cables. Make certain that data transmission
circuits are properly separated from power lines.
 For connections over longer distances, it is better to end the line with resistors on both ends, inserting the two R
TERM jumpers (available on the terminal strip beside the CAN serial as the default factory configuration).
NOTE 2
The maximum distance depends on the baud setting.
Kb/s (Kbaud) On-board
CAN
50 Kbaud 1000m
125 Kbaud 500m
250 Kbaud 250m
500 Kbaud 60m
NOTE 3
5-way terminal strip:
 3-way ( “GS“, “H and “L”) serial CAN

2-way POWER supply
Temperature
probes
Pressure probes
CAN