Additional Protection; Leakage Current; Connection Terminals - Grundfos CRE Notice D'installation Et De Fonctionnement

4.2.4 Additional protection

DANGER
Electric shock
Death or serious personal injury
- Only use residual-current circuit breakers (ELCB,
GFCI, RCD) of type B.
The residual-current circuit breaker must be marked with the
following symbol:
The total leakage current of all the electrical equipment in the
installation must be taken into account. You find the leakage
current of the motor in sections

10.4.2 Leakage current

(AC).
This product can cause a direct current in the protective ground
conductor.
Overvoltage and undervoltage protection
Overvoltage and undervoltage may occur in case of unstable
power supply or a faulty installation. The motor is stopped if the
voltage falls outside the permissible voltage range. The motor
restarts automatically when the voltage is again within the
permissible voltage range. Therefore, no additional protection
relay is required.
The motor is protected against transients from the
power supply according to EN 61800-3. In areas with
high lightning intensity, we recommend external
lightning protection.
Overload protection
If the upper load limit is exceeded, the motor automatically
compensates for this by reducing the speed and stops if the
overload condition persists.
The motor remains stopped for a set period. After this period, the
motor automatically attempts to restart. The overload protection
prevents damage to the motor. Consequently, no additional motor
protection is required.
Overtemperature protection
The electronic unit has a built-in temperature sensor as an
additional protection. When the temperature rises above a certain
level, the motor automatically compensates for this by reducing
the speed and stops if the temperature keeps rising. The motor
remains stopped for a set period. After this period, the motor
automatically attempts to restart.
Protection against phase unbalance
Three-phase 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.

4.2.5 Connection terminals

The descriptions and terminal overviews in this section apply to
both single- and three-phase motors.
For maximum torques, see section Torques, page 66.
10
10.3.2 Leakage current and
Connection terminals, CRE, CRIE, CRNE, CRKE, SPKE,
MTRE and CME pumps
CRE, CRIE, CRNE, CRKE, SPKE, MTRE and CME 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 fig. 8.
Digital input 1 is factory-set to be start-stop input
where 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 below are separated from each
other by reinforced insulation in their entire
lengths.
• Inputs and outputs
All inputs and outputs are internally separated from the power
supply-conducting parts by reinforced insulation and galvanically
separated from other circuits. All control terminals are supplied by
protective extra-low voltage (PELV), thus ensuring protection
against electric shock.
• Start-stop: (Digital input 1) = Terminals 2 and 6
• Pressure sensor: (Analog input 1) = Terminals 4 and 8
• Pressure switch: (Digital input 3) = Terminals 6 and 10
• External analog signal input: (Analog input 2) = Terminals 7
and 23
• GENIbus Terminals A, Y and B
• 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.
• Power supply (terminals N, PE, L or L1, L2, L3, PE).