English (GB)
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19. Digital input
Hydro Multi-E has a digital input for external faults. The input has
been factory-set to external fault and will be active in closed
condition.
Functional diagram: input for digital function
If the digital input is active for more than 10
seconds (s), Hydro
Multi-E will stop because of an external fault.
The digital input is used for the dry-running protection.
20. Data communication
It is possible to connect the system to an external network. The
connection can be made via a GENIbus-based network or a
network based on another fieldbus protocol.
The system can communicate via CIM modules. This enables the
system to communicate with different types of network solutions.
A CIM module is an add-on communication interface module. The
CIM module enables data transmission between the pump and an
external system, for example a BMS or SCADA system.
For further information on CIM modules, see www.grundfos.com
(Grundfos Product Center) or contact Grundfos.
21. Insulation resistance
22. Maintenance
22.1 Pumps
Pump bearings and shaft seals are maintenance-free.
If CRE or CRIE pumps are to be drained for a long period of
inactivity, remove one of the coupling guards to inject a few drops
of silicone oil on the shaft between the pump head and the
coupling. This will prevent the shaft seal faces from sticking.
22.2 Motors
Keep motor cooling fins and fan blades clean to ensure sufficient
cooling of the motor and electronics.
22.3 Breaker cabinet
The breaker cabinet is maintenance-free. Keep it clean and dry.
23. Shutdown
Shut down the system with the main switch in the breaker
cabinet.
To shut down a pump, switch off the circuit breaker of the pump.
23.1 Frost protection
If pumps are not used during periods of frost, they must be
drained to avoid damage.
Drain the pump by loosening the vent screw in the pump head
and removing the drain plug from the base.
Do not tighten the vent screw or refit the drain plug until the
system is to be used again.
23.2 Service kits
See Grundfos Product Center for service manuals.
Digital function
(terminals 1 and 9)
Normal duty
External fault
Q
H
Q
H
10 s
Do not measure the insulation resistance of motor
windings or an installation incorporating motors with
integrated frequency converters using high-voltage
megging equipment, as this may damage the built-in
electronics.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply and wait at least five
minutes before you start any work on the product.
Make sure that the power supply cannot be
accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- Do not touch the conductors in front of the main
switch as they are still energised.
