17. 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
Digital function
(terminals 1 and 9)
Normal duty
External fault
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.
18. 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 Grundfos Product
Center at www.grundfos.com or contact Grundfos.
19. Servicing the product
DANGER
Electric shock
Death or serious personal injury
‐ Before you maintain the system, make sure that the
power supply is disconnected and cannot be
accidentally switched on.
WARNING
Contaminated drinking water
Death or serious personal injury
‐ Flush the system after a standstill period in
compliance with local legislation.
WARNING
Overhead load
Death or serious personal injury
‐ Use hard hat.
CAUTION
Overhead load
Minor or moderate personal injury
‐ Use appropriate tools and lifting equipment for
maintenance.
19.1 Maintaining the product
19.1.1 Pumps
Pump bearings and shaft seals are maintenance-free.
If 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.
19.1.2 Motors
Keep motor cooling fins and fan blades clean to ensure sufficient
cooling of the motor and electronics.
Motors above 7.5 kW must be lubricated according to the
recommended intervals and type of bearing grease stated on the
motor.
Motors above 10.0 Hp (7.5 kW) must be lubricated according to the
recommended intervals and type of bearing grease stated on the
motor.
19.1.3 Breaker cabinet
The breaker cabinet is maintenance-free. Keep it clean and dry.
19.1.4 Service kits
See Grundfos Product Center at www.grundfos.com for service
manuals.
19.2 Taking the product out of operation
DANGER
Electric shock
Death or serious personal injury
‐ Make sure that the power supply is disconnected and
cannot be accidentally switched on.
Drain the product if you are not going to use it for a long
time.
1. Switch off the main switch to take the system out of operation.
2. Switch off the corresponding motor protective circuit breaker,
automatic circuit breaker or fuse to take the individual pump out
of operation.
19.2.1
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.
19.3 Startup the product after standstill
WARNING
Contaminated drinking water
Death or serious personal injury
‐ Flush the system after a standstill period in
compliance with local legislation.
See section Startup for further instructions.
Related information
7. Startup
41
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