Carel pCO5+, User Manual

Page: 26 / 60

26
ENG
pC0300020EN rel. 1.2 - 07.11.2013
5. INPUT/OUTPUT CONNECTIONS
5.1 Power supply
The fi gure below shows the power supply connection diagram. Use
a class II safety isolating transformer with short-circuit and overload
protection. See the Technical Specifi cations table for information on the
size of the transformer required by each controller model.
24 Vac
230 Vac
2.5 A T
G G0
J1
28...36 Vdc
2.5 A T
G G0
J1
- +
AC
DC
Fig. 5.a
Important:
•
power the pCO5+ built-in driver with AC voltage only, with the
transformer’s secondary winding earthed;
•
using a supply voltage other than specifi ed can seriously damage the
controller;
•
if the transformer’s secondary is earthed, make sure that the earth
conductor is connected to terminal G0. This applies to all the devices
connected to the pCO through a serial network;
•
if more than one pCO board is connected to a pLAN network, make
sure that the G and G0 references are observed (G0 must be maintained
for all controllers);
•
the power supply to the controller(s) and the terminal(s) should be
kept separate from the power supply to the other electrical devices
(contactors and other electromechanical components) inside the
electrical panel.
Note:
•
the yellow LED on the controller lights up when the controller is
powered;
•
refer to the diagrams in par. 4.4 in case of controllers connected to a
pLAN network and installed in the same electrical panel or in separate
panels.
5.2 Universal inputs/outputs
Universal inputs/outputs are distinguished by the letter U...
They can be confi gured from the application program for many diff erent
uses, such as the following:
•
passive temperature probes: NTC, PTC, PT100, PT500, PT1000;
•
active pressure/temperature/humidity probes;
•
ratiometric pressure probes;
•
current inputs, 0 to 20 mA or 4 to 20 mA;
•
voltage inputs, 0 to 1 Vdc or 0 to 10 Vdc;
•
voltage-free contact digital inputs and fast digital inputs;
•
analogue outputs, 0 to 10 Vdc;
•
PWM outputs.
Important:
•
the universal inputs/outputs must be pre-confi gured to handle their
respective signals from the application program;
•
the universal inputs/outputs cannot be used as digital outputs.
Max. number of connectable analogue inputs
The maximum number of analogue inputs that can be connected to the
universal inputs/outputs depends on the type used.
Max. number of inputs connectable to
universal inputs/outputs
Type of signal
pCO5+
Small
Medium/ Built-in
driver/ Extralarge
Large
Analogue inputs
- NTC/PTC/PT500/
PT1000 probes
5 8 10
- PT100 probes 2
3 (2 on U1...U5,
1 on U6...U8)
4 (2 on U1...U5,
1 on U6...U8,
1 on U9...U10)
- 0 to 1 Vdc/0 to 10 Vdc
signals from controller-
powered probes
Tot. max. 5
5
Tot. max. 8
6
Tot. max. 10
6
- 0 to 1 Vdc/0 to 10 Vdc
signals from externally
powered probes
5 8 10
- 0 to 20 mA/4 to 20 mA
inputs from controller-
powered probes
Tot. max. 4
4
Tot. max. 7
6:
(max 4 on U1...U5,
3 on U6...U8)
Tot. max. 9
6:
(max 4 su U1...U5,
3 on U6...U8,
2 on U9...U10)
- 0 to 20 mA/4 to 20 mA
inputs from externally
powered probes
4
7:
(max 4 on U1...U5,
3 on U6...U8)
9:
(max 4 on U1...U5,
3 on U6...U8,
2 on U9...U10)
- 0 to 5 V signals from
controller-powered
ratiometric probes
5 6 6
Tab. 5.a
Note: The table shows the maximum number of inputs that can be
connected. For example, a Small controller can be connected to a
maximum of fi ve 0 to 1 Vdc inputs from controller-powered probes and a
maximum of fi ve 0 to 1 Vdc inputs from externally powered probes. In any
case, the maximum number of inputs of both kinds that can be connected
is 5.
Remote connection of analogue inputs
The table below shows the required cable sizes to use for the remote
connection of the analogue inputs.
Type of input
Cross section for lengths
<50 m (mm
2 )
Cross section for lengths
<100 m (mm
2 )
NTC 0,5 1,0
PT1000 0,75 1,5
I (current) 0,25 0,5
V (current) 0,25 0,5
Tab. 5.b
Important:
•
if the controller is installed in an industrial environment (standard
EN 61000-6-2) the connections must be less than 10 m long; do not
exceed this length to avoid measurement errors.
•
to avoid electromagnetic interference, keep the probe and digital
input cables separated from the power cables as much as possible (at
least 3 cm). Never run power cables and probe signal cables in the
same conduits (including the ones in the electrical panels).