11. Taking the product out of operation
Switch off the main switch to take the system out of operation.
WARNING
Electric shock
Death or serious personal injury
- Do not touch the conductors in front of the main
switch as they are still energised.
- Lock the main switch with a padlock to ensure that
the power supply cannot be accidentally switched
on.
12. Technical data
12.1 Temperature
Ambient temperature:
0-40 °C.
12.2 Relative humidity
Maximum 95 %.
12.3 Electrical data
Supply voltage
See the nameplate of the system.
Backup fuse
See the wiring diagram supplied with the system.
Digital inputs
Open-circuit voltage:
24 VDC
Closed-circuit current: 5 mA, DC
Frequency range:
0-4 Hz
All digital inputs are supplied with PELV voltage
(Protective Extra-Low Voltage).
Analog inputs
Input current and voltage:
Tolerance:
Repetitive accuracy:
Input resistance, current:
Input resistance, voltage, CU 352:
Input resistance, voltage, IO 351:
Supply to sensor:
All analog inputs are supplied with PELV voltage
(Protective Extra-Low Voltage).
Digital outputs (relay outputs)
Maximum contact load: 240 VAC, 2 A
Minimum contact load:
5 VDC, 10 mA
All digital outputs are potential-free relay contacts.
Some outputs have a common C terminal. For further
information, see the wiring diagram supplied with the
system.
0-20 mA
4-20 mA
0-10 V
± 3.3 % of full scale
± 1 % of full scale
< 250 Ω
50 kΩ ± 10 %
> 50 kΩ ± 10 %
24 V, maximum 50 mA,
short-circuit protected
Inputs for PTC sensor/thermal switch
For PTC sensors to DIN 44082. Thermal switches can also be
connected.
Open-circuit voltage:
12 VDC ± 15 %
Closed-circuit current: 2.6 mA, DC
Inputs for PTC sensors are electrically separated
from the other inputs and outputs of the system.
12.4 Measuring parameters
12.4.1 Transmitter types
The transmitter types in the table below can be used for the
measurement of values in the system.
Abbreviation
Transmitter
DPT
Differential-pressure transmitter
DTT
Differential-temperature transmitter
FT
Flow transmitter
LT
Level transmitter
PT
Pressure transmitter
TT
Temperature transmitter
12.4.2 Parameter list
The table below shows which measured values CU 352 can
receive via its analog inputs. Figures
values can be measured.
Number
Parameter
1
Flow rate
2
Outlet pressure
3
Differential pressure, external
4
Inlet pressure
5
Differential pressure, pump
6
Differential pressure, inlet
7
Differential pressure, outlet
8
Tank level, outlet side
9
Tank level, inlet side
10
Return-pipe temperature, external
11
Flow-pipe temperature
12
Return-pipe temperature
13
Differential temperature
14
External pressure
15
Series 2000, differential pressure
16
Series 2000, flow rate
17
System pressure
Not shown
Ambient temperature*
Not shown
0-100 % signal**
* The ambient temperature is typically the temperature in the
room where Control MPC is located.
** A 0-100 % signal from an external controller. It can for
instance be a 0-10 V signal.
145
to
148
show where the
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