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24 Vdc digital inputs
The following fi gure represents an example for connecting the 24 Vdc
digital inputs on pRack models S, M, L.
24 Vdc
+
–
Fig. 3.h
230 Vac digital inputs
pRack M, D, L models have up to two groups of inputs powered at 230
Vac 50/60 Hz +10/-15%; each group features two inputs. The groups have
double insulation between them and can have diff erent voltages.
Important: within each group the inputs must be powered at the
same voltage to avoid short-circuits or powering lower voltage
inputs at 230 Vac.
The range of uncertainty of the switching threshold is from 43 to 90 Vac.
It is recommended to use a 100 mA fuse in series with the digital inputs.
The following fi gure represents an example for connecting the 230 Vac
digital inputs on pRack models M, D, L.
J19
3.4.8
Remote connection of the digital inputs
Important note: do not connect other devices to the digital inputs
IDn inputs.
The Sizes of the cables for the remote connection of the digital inputs are
shown in the following table:
2
Size (mm
) for length up to 50 m Size (mm
0,25
If the product is installed in industrial environments (application of the EN
61000-6-2 standard) the length of the connections must be less than 30 m.
This length shouldn't be exceeded in any case, to avoid measurement errors.
3.5 Connecting the analogue outputs
3.5.1
Connecting 0...10 V analogue outputs
The pRack pR300 provides 0...10 V optically-isolated analogue outputs,
powered externally at 24 Vac/Vdc.
The fi gure below shows the electrical connection diagram; the 0V (zero)
of the power supply is also the reference for the output voltage:
V
out
V
out
V
out
V
out
24 Vac/Vdc
0 V
J20
Fig. 3.i
2
) for length until 100 m
0,5
J20
V
out
V
out
Fig. 3.j
Hardware Version
Terminals
S, M, D
Y1, Y2, Y3, Y4
L
Y1, Y2, Y3, Y4, Y5, Y6
3.5.2
Optional modules
Module for converting a PWM analogue output to a liner 0...10 V and
4...20 mA analogue output (code CONV0/10A0)
The module is used to convert a PWM output (5 V pulses) to a liner 0...10
V and 4...20 mA analogue output (code CONV0/10A0). The control Signal
(at the input terminals optically-isolated from the rest of the module)
must have a maximum amplitude of 5V and a period between 8 ms and
200 ms. The 0...10 V output voltage can be connected to a maximum
load of 2 k , with a maximum ripple of 100 mV. The 4...20 mA current
output can be connected to a maximum load of 280 , with maximum
overshoot of 0.3 mA. The mechanical dimensions of the module are
87x36x60 mm (2 DIN modules) with IP20 index of protection.
Module for converting a 0...10 V analogue output to an SPDT digital
output (code CONVONOFF0)
The module is used to convert a 0...10 V analogue output to an ON/OFF relay
output. The control Signal (at the input terminals, optically-isolated from the
rest of the module), to ensure the switching of the relay from OFF to ON, must
have a maximum amplitude of 3.3 V. The relay is SPDT, with max current of
10 A and max inductive load of 1/3 HP. The mechanical dimensions of the
module are 87x36x60 mm (2 DIN modules) with IP20 index of protection.
3.6 Connecting the digital outputs
3.6.1
Electromechanical relay digital outputs
The pRack pR300 features digital outputs with electromechanical relays.
For ease of installation, the common terminals of some of the relays have
been grouped together.
The following fi gure illustrates a connection example. If the following this
diagram is used, the current at the common terminals must not exceed
the rating (nominal current) of a single terminal (8 A).
The relays are divided into groups, according to the degree of insulation.
Inside each group, the relays have just basic insulation and thus must have
the same voltage (generally 24V ac or 110 to 230 Vac). Between the groups
there is double insulation and thus the groups can have diff erent voltages.
There is also double insulation from the rest of the controller.
Changeover outputs
Some relays feature changeover outputs, the number of changeover
outputs depends on whether or not there are solid state relays (SSR) and
consequently varies depending on the models.
Hardware version Changeover relay reference,
without SSR model
PRK300**F* models
S
8
M, D
8, 12, 13
L
8, 12, 13, 14, 15
3.6.2
Solid state relay (SSR) digital outputs
The pRack pR300 also features a Version with solid state relays (SSR) on
some models for controlling devices that require an unlimited number of
switching cycles and thus would not be supported by electromechanical
relays (e.g. screw compressor valves).
25
ENG
Reference
VG0
VG0
Tab. 3.i
Fig. 3.k
Terminal
J15
J15, J17, J18
J15, J17, J18, J21
Tab. 3.j
pRack +0300025EN rel. 1.3 - 17.12.2015
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