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SE process chiller +030220416 - rel. 2.2 - 25.01.2013

2.7 Connection with CONV0/10VA0 and CONVONOFF0 modules (accessories)

The CONV0/10AVA0 and CONVONOFF0 modules allow to convert a PWM output for SSR respectively into an analogue output 0…10Vdc and into an ON/OFF output with relay.

Note that with the same controller 3 different types of outputs can be obtained.

Key

CONV0/10A0 - CONVONOFF0

module

CONV0/10A0 module CONVONOFF0 module

Terminal Description Terminal Description Terminal Description

1 24 Vac power supply 5 0...10 Vdc output reference 5 Normally open

2 Powe

supply reference 6 0...10 Vdc outpu

6Common

3 PWM (+) command signal 7 4...20 mA output reference 7 Normally closed

4 PWM

(

-) command signal 8 4...20 mA output 8 Not connected

The command signal to terminals 3 and 4 of the CONV0/10VA0 and CONVONOFF modules is optically-isolated. This allows the power supply G, G0 can be in common with the

controller power supply.

2.8 Installation

2.8.1 General warnings

Disconnect power supply before working on the board during assembly,

maintenance and replacement.

Do not install the controllers in environments with the following features:

• relative humidity over 90% or condensing;

• strong vibrations or blows;

• exposure to continuous jets of water;

• exposure to aggressive and polluting atmospheres (e.g. sulphuric and ammonia

gases, saline mists, fumes) to prevent corrosion and/or oxidation;

• high magnetic and/or radiofrequency interference (avoid installation of the

equipment near to transmitting antennas);

• exposure of the controllers to direct solar radiation and atmospheric agents in

general.

The following recommendations must be respected when connecting the

controllers:

• the incorrect connection to the power supply voltage can seriously damage the

controller;

• separate the probe cables and the digital input cables as much as possible (at

least 3 cm) from the inductive load and power cables to prevent possible electro-

magnetic interference. Never introduce power cables and probe cables (including

those of electric control board) into the same cable conduits.

• do not install the probe cables in the immediate vicinity of power devices

(switches, magnet circuit breaker switches, etc.). Reduce the probe cable pathway

as much as possible and do not allow routes that enclose power devices;

• do not power the controller directly from the main panel power supply if also

supplying power to other devices, such as switches, solenoid valves etc. which will

require another transformer. The controller is not an appliance that guarantees

electrical safety, but simply suitable operation: to prevent a dangerous situation

being generated following a short circuit or overload, the customer must install

suitable electro-mechanical cut-off devices on the lines of interest (fuses or similar).

2.8.2 Electric connections

Proceed as follows for installation, making reference to the wiring diagrams:

1. Connect probes and power supply: the probes can be installed up to a

maximum distance of 10 metres from the controller as long as shielded cables with

minimum section of 1 mm

are used. To improve immunity to interference, it is

recommended to use probes with shielded cable (connect just one end of the

shield to the electric control board earth).

2. Program the controller: see the “User interface” chapter.

3. Connect the actuators: it is preferable to connect the actuators only after having

programmed the controller. It is recommended to carefully evaluate the maximum

capacities of the relays indicated in the “technical specifications”.

4. Connect the serial network: if the connection to the supervision network is

envisioned via the relevant serial boards (code MCH2004850), the system must be

earthed. Make sure there is just one earth connection. In particular, the

transformers secondary device, which powers the controllers, must not be

connected to earth. If connection to a transformer with earthed secondary device is

necessary, an isolation transformer must also be used. It is possible to connect

several controllers to the same isolation transformer, however it is recommended

to use one isolation transformer for every controller.

Case 1: several controllers connected in network powered by the same transformer

(G0 not connected to earth). Typical application of several controllers inside the

same electric control board