4.6 Additional protection
Systems with single-phase motors
If Hydro Multi-E is connected to an electric installation where an
earth leakage circuit breaker (ELCB) or ground fault circuit
interrupter (GFCI) is used as additional protection, this circuit
breaker or interrupter must be marked with the following symbol:
ELCB
(GFCI)
RDC Type A
When an earth leakage circuit breaker or ground fault
circuit interrupter is selected, the total leakage current of
all the electrical equipment in the installation must be
taken into account.
The leakage current of Hydro Multi-E can be found in section
Leakage current.
Systems with three-phase motors
If Hydro Multi-E is connected to an electric installation where an
earth leakage circuit breaker (ELCB) or ground fault circuit
interrupter (GFCI) is used as additional protection, this circuit
breaker or interrupter must be of the following type:
• It must be suitable for handling leakage currents and cutting-in
with short pulse-shaped leakage.
• It must trip when alternating fault currents and fault currents with
DC content, i.e. pulsating DC and smooth DC fault currents,
occur.
For these systems an earth leakage circuit breaker or ground fault
circuit interrupter, type B, must be used.
This circuit breaker or interrupter must be marked with the following
symbols:
ELCB
(GFCI)
RDC Type B
The leakage current of Hydro Multi-E can be found in section
Leakage current.
Protection against phase unbalance
The motors must be connected to a power supply with a quality
corresponding to IEC 60146-1-1, class C, to ensure correct motor
operation at phase unbalance.
This also ensures long life of the components.
Related information
21.2 Leakage current
4.7 Connection terminals
The descriptions and terminal overviews in this section apply to
both single- and three-phase motors.
For maximum torques, see section Torques.
4.7.1 Connection terminals, CRE, CRIE and CRNE pumps
CRE, CRIE and CRNE pumps have a number of inputs and outputs
enabling the pumps to be used in advanced applications where
many inputs and outputs are required.
The pumps have these connections:
• three analog inputs
• one analog output
• two dedicated digital inputs
• two configurable digital inputs or open-collector outputs
• Grundfos Digital Sensor input and output
• two Pt100/1000 inputs
• two LiqTec sensor inputs
• two signal relay outputs
• GENIbus connection.
See the figure below for connection terminals of CRE, CRIE and
CRNE pumps.
Digital input 1 is factory-set to be the start-stop input when
open circuit results in stop. A jumper has been factory-
fitted between terminals 2 and 6. Remove the jumper if
digital input 1 is to be used as external start-stop or any
other external function.
DANGER
Electric shock
Death or serious personal injury
‐ Make sure that the wires to be connected to the
connection groups are separated from each other by
reinforced insulation in their entire lengths.
• Inputs and outputs
All inputs and outputs are internally separated from the mains-
conducting parts by reinforced insulation and galvanically separated
from other circuits. All control terminals are supplied by protective
extra-low voltage (PELV) to ensure protection against electric
shock.
• Signal relay outputs
- Signal relay 1:
LIVE: You can connect supply voltages up to 250 VAC.
PELV: The output is galvanically separated from other
circuits. Therefore, you can connect the supply voltage or
protective extra-low voltage to the output as desired.
- Signal relay 2:
PELV: The output is galvanically separated from other
circuits. Therefore, you can connect the supply voltage or
protective extra-low voltage to the output as desired.
• Mains supply (terminals N, PE, L or L1, L2, L3, PE).
11
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