Grundfos CONTROL MPC Installation And Operating Instructions Manual page 63

14. Maintenance
Warning
Before starting work on the Control MPC, make
sure that the electricity supply has been
switched off. Lock the main switch with a
padlock to ensure that it cannot be accidentally
switched on.
14.1 CU 351
The CU 351 is maintenance-free. It must be kept clean and dry.
Protect it against direct sunlight. Furthermore, the CU 351 must
not be outside the ambient temperature range. See section
16. Technical data.
15. Taking out of operation
Switch off the main switch to take the Control MPC out of
operation.
Warning
The conductors in front of the main switch are
still energised. Lock the main switch with a
padlock to ensure that it cannot be accidentally
switched on.
16. Technical data
16.1 Temperature
Ambient temperature: 0 °C to +40 °C
16.2 Relative humidity
Max. relative humidity: 95 %
17. Electrical data
Supply voltage
See nameplate of the Control MPC.
Backup fuse
See the wiring diagram supplied with the Control MPC.
Digital inputs
Open circuit voltage:
Closed circuit current:
Frequency range:
All digital inputs are supplied with PELV voltage
Note
(Protective Extra-Low Voltage).
Analog inputs
Input current and voltage:
Tolerance:
Repetitive accuracy:
Input resistance, current:
Input resistance, voltage, CU 351:
Input resistance, voltage, IO 351:
Supply to sensor:
All analog inputs are supplied with PELV voltage
Note
(Protective Extra-Low Voltage).
24 VDC
5 mA, DC
0-4 Hz
0-20 mA
4-20 mA
0-10 V
±3.3 % of full scale
±1% of full scale
< 250 Ω
10 kΩ ±10 %
> 50 kΩ ± 10 %
24 V, maximum 50 mA,
short-circuit protected
Digital outputs (relay outputs)
Maximum contact load:
Minimum contact load:
All digital outputs are potential-free relay contacts.
Some outputs have a common C terminal. For
further information, see the wiring diagram
Note
supplied with the Control MPC.
Inputs for PTC sensor/thermal switch
For PTC sensors to DIN 44082. Thermal switches can also be
connected.
Open circuit voltage:
Closed circuit current:
Inputs for PTC sensors are electrically separated
from the other inputs and outputs of the Control
Note
MPC.
18. Related documents
Further product information about Control MPC and pumps that
can be controlled by the Control MPC are available in WebCAPS
on Grundfos' homepage, www.grundfos.com.
19. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
240 VAC, 2 A
5 VDC, 10 mA
12 VDC ±15 %
2.6 mA, DC
Subject to alterations.
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