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14. Maintenance
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.
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
Analog inputs
Digital outputs (relay outputs)
All digital outputs are potential-free relay contacts.
Inputs for PTC sensor/thermal switch
For PTC sensors to DIN 44082. Thermal switches can also be
connected.
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.
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.
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.
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).
Input current and voltage:
0-20 mA
4-20 mA
0-10 V
Tolerance: ±3.3 % of full scale
Repetitive accuracy: ±1% of full scale
Input resistance, current: < 250 Ω
Input resistance, voltage, CU 351: 10 kΩ ±10 %
Input resistance, voltage, IO 351: > 50 kΩ ± 10 %
Supply to sensor:
24 V, maximum 50 mA,
short-circuit protected
All analog inputs are supplied with PELV voltage
(Protective Extra-Low Voltage).
Maximum contact load: 240 VAC, 2 A
Minimum contact load: 5 VDC, 10 mA
Some outputs have a common C terminal. For
further information, see the wiring diagram
supplied with the Control MPC.
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 Control
MPC.
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