Maintenance; Shutdown; Technical Data; Temperature - Grundfos Control MPC Installation And Operating Instructions Manual

11. Maintenance

Warning

Before starting work on the product, switch off the
power supply.
Lock the main switch with a padlock to ensure that
the power supply cannot be accidentally switched on.
11.1 CU 352
The CU 352 is maintenance-free. Keep the unit clean and dry,
and protect it against direct sunlight. Ambient temperature,
see section
13. Technical data.

12. Shutdown

Switch off the main switch to take the system 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
the power supply cannot be accidentally switched on.

13. Technical data

13.1 Temperature

Ambient temperature: 0 °C to +40 °C

13.2 Relative humidity

Max. relative humidity: 95 %
14. Electrical data
Supply voltage
See 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
Note
(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
Note
(Protective Extra-Low Voltage).
64
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
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
Note information, see the wiring diagram supplied with the
system.
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
Note
from the other inputs and outputs of the system.

15. Further product documentation

Further information about Control MPC and pumps that can be
controlled by the Control MPC is available in WebCAPS on
Grundfos' homepage, www.grundfos.com.

16. 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.
Subject to alterations.