How to be connected inputs and outputs?
INSTALLATION: specifications for proper installation
The electrical connections are made via numbered and disconnect terminal blocks from the back of device.
During wiring, the connection of the device is facilitated if the mobile part of the connector is removed from the fixed part . The different number, shape, and the possible key to prevent incorrect insertion of the connector of the mobile part. The following notes, allow you to make a correct installation. The voltage to 24 VAC from the transformer is split over 2 lines one for other users, one called G and G0 for food and its associated control circuits, power actuators and transducers * The line G0, then the 0-volt transformer are grounded through appropriate links

 

POWER: connect
The power supply of the device is protected from momentary input overvoltage up to + 20% of the nominal value. We recommend that you use surge arresters placed upstream of the transformer particularly when not predicted the magnitude of voltage (eg when the network is aerial or otherwise subjected to the effect of static electricity or lightning). The failure caused by a wrong power supply is not covered by warranty.

 

PROBE PT 100: connect
Given the low signal obtained from Pt 100 sensors need the following: connect the sensor inputs at the device with 3-wire shielded cable with the same section, connect the shield at only one point to the ground terminal. The signal cable should be installed in conduit separate from the command relay and contactors and, in any case where there are cables with voltage above 50 V. When working in the same metal conduit using the appropriate metal separators and its cap. The compensation of the resistance of the cable connection of PT100 is done automatically by the device, if the connection is made ​​with 3-wire cable cross-section equal and the total resistance which is less than 20 ohms (eg, from 0.5 sq mm cable is can arrive at to 100 meters).

 

TRANSDUCERS: connection with current or voltage output
These transducers require power, for transducers with mA output can have 2 versions: 0÷20 mA with 3-wire (+ input, output, output and power supply common) 4÷20 mA 2-wire connection (+input, output). There is a voltage of 20 Vdc (max. 60 mA) to power the transducers. Max 2 transducers (the sum of the absorption must not exceed 60 mA in the conditions outside the range of the transducer). If the absorption of the transducers is greater need to equip the power supply module 0 V connected to ground at only one point. This wire will also be the zero reference for the other transducers powered feeder.

 

CORRENT OUTPUTS: connect
The current outputs are used to control actuators in proportional to current (0÷20 mA, 4÷20 mA) and in proportional to voltage 0÷10V.The input resistance for current actuators must be less to 600 ohms. Actuators operating in tension are advantageously connected to the device transforming the current output voltage by connecting a shunt resistor (accessory module code. 30E20050) just across the entrance of the actuator itself. This module can be replaced by a resistance calculated as follows: eg. actuator with control voltage 0 to 10 V and input resistance 20 ohm shunt resistor will be: R = [10 * 20,000 / ((20,000 * 0.02) - 10)] = 513 ohms with a tolerance of 1%. This connection allows the automatic compensation of line resistance, view of the actuator, up to values ​​of 50 ohms. If you do not use the outputs to control actuators can be exploited to control ON-OFF relay.

 

STATIC OUTPUTS: connect

The control outputs are to be interpreted as an open contact that closes when they are commanded by the device, they are suitable for power relays supplied at 24 Vac Upon power up of device, after a few seconds, ONLY if there are no programming errors, failures or internal probes or alarms on the variables measured, the device activates the general alarm output. RT device allows the delay not to activate the alarm (Alarm ) during the transitional ignition. When using the relay contacts of rescuers to drive inductive loads (coils, relays, contactors, solenoids) is need to limit the overvoltage across the inductor at each opening of the contact by entering: RC-group if the load is powered with AC Antiparallel diode when the load is powered with DC.

 

DIGITAL INPUTSI: connect
The digital inputs are characterized by a common to connect to free contacts. There are various types of digital inputs: 24 Vac/Vdc and 48 Vac/ dc.

 

RS-485 SERIAL LINE: connect
The RS-485 interface allows you to build networks with multiple devices on a single communication line as shown in figure

 

ADJUSTMENT TO INSERT A BENCH: how it works
An example of adjustment "ibench": CRITERIA chilled water temperature control. The PALC maintains the desired value (set point) of temperature of water returning from users. The PALC gives command to CHILLER generated by a specific algorithm that varies the command frequency as a function of temperature error. The operation of this algorithm is characterized by the following programmable parameters, on-site, by operator: SET POINT temperature value of return water = return water temperature desired. ZMP = positive delta temperature set point above which the conditions exist for the activation of CHILLER. ZMN = negative delta temperature set point below which the conditions exist for the deactivation of CHILLER. The temperature range defined by the following two values​​, (set-point + ZMP) and (set-point - ZMN) is called DEAD BANDA, within that interval, the control does not change the number compressors in operation. PROPORZIONAL BAND= proportional band BP, defined as an absolute value: (Set-point + ZMP + BP) for insertion and ( Set-point + ZMN - BP) for shutting off the proportional insertion of the CHILLER MINIMUM DELAY START = minimum time delay T. ATT. between activation and the next. MINIMUM DELAY DEACTIVATION = minimum time delay between a deactivation T.DIS and the next. When the temperature is outside the dead band, the PALC starts the activation process of a compressor, if the previous condition persists, the elapsed T.ATT time the PALC starts to put a new compressor. The time of next compressor activation is inversely proportional to the temperature error. The insertion maximum frequency is limited by data T. ATT. similarly, the shutdown maximum frequency is limited by data T. DIS. The control, if properly programmed, allows arm / disarm an compressor only after verifying the effect that the previous action had on the system. The activation of the compressors is based on the level of priority, are: LIV1 first to be inserted LIV 2 seconds to be inserted LIV 3 last to be inserted (reserves)

 

LEVEL SYSTEM: how it works
Each level or alarm is characterized by action type TOP or BOTTOM and the following four programmable parameters: SET POINT: value, which if exceeded causes the onset of the alarm; HYSTERESIS: increase or decrease of the SP that defines the return value of alarm. AUTORITEGNO: if programmed on, the alarm signal is maintained even if the conditions that have given rise to have lapsed. The alarm must be reset manually. DELAY: The period that elapses between the onset of the alarm and the time it is reported. Setting a delay helps to filter out any momentary transitions of the system that do not involve own problems in terms of correct operation. When programming an alarm can be disabled by resetting the set point. In this case, the other details thereof are not displayed. The type of surgery (upper or lower) but is not programmable by the user. Alarms are used, unless otherwise noted above (less hysteresis) for alarms and alarms higher maximum (upper hysteresis) for alarms to a minimum. At the successful completion of a programmed level corresponds to the activation of a flag, as shown in the figure below (which does not include delays and autoritegnio, this event may be associated with different actions, such as the implementation of a command or simply reporting alarm arose.

-Example of system response to changes in the values controlled