Electrical Connection; Starting Up The Product; Preparing The Pump For Startup - Grundfos DMX 221 Installation And Operating Instructions Manual

Related information
2.1.1 Installation requirements

2.3 Electrical connection

2.3.1 Safety instructions and requirements for
electrical connection
DANGER
Electric shock
Death or serious personal injury
‐
All electrical connections must be
carried out by qualified persons.
‐
Do not open the pump housing.
‐
Switch off the power supply before
making any electrical connections.
WARNING
Chemical hazard
Death or serious personal injury
‐
Make sure the pump has been
correctly installed and is ready to be
started before you switch on the power
supply.
• Make sure the power supply specified on the
nameplate matches the local conditions.
• Protect the cable connections and plugs against
corrosion and humidity.
• Isolate the power supply electrically from the
signal inputs and outputs.
• Observe the direction of rotation of the motor.
• Provide the motor with a protective circuit
breaker and set it to the rated motor current.
• Three-phase motors are factory-set for star
connection.
• When the pump is used with a frequency
converter, make the connection according to the
voltage of the frequency converter.
• Observe the relevant sections or instructions
when connecting electronic components.
Related information
2.3.2 Making electrical connection with mains plug
2.3.3 Making electrical connection without mains
plug
2.3.2 Making electrical connection with mains
plug
1. Switch off the power supply to the power socket.
2. Insert the mains plug of the pump into the power
socket.
Related information
2.3.1 Safety instructions and requirements for
electrical connection
2.3.3 Making electrical connection without mains
plug
• Observe section Safety instructions and
requirements for electrical connection.
1. Switch off the power supply.
2. Open the terminal box on the motor.
3. Connect the motor according to the wiring
diagram printed on the inside of the terminal box
cover.
4. Close the terminal box on the motor.
Related information
2.3.1 Safety instructions and requirements for
electrical connection

3. Starting up the product

3.1 Preparing the pump for startup

• Observe section Safety instructions and
requirements for startup.
• Make sure the pump has been connected
electrically by a qualified person.
• Make sure the power supply specified on the
nameplate matches the local conditions.
• Check that all pipe or hose connections have
been tightened properly and tighten them, if
necessary.
• Check that the dosing head screws have been
tightened with the specified torque and tighten
them, if necessary.
• Check that the vent plug on the pump housing is
open.
• For pumps with integral relief valve: Check that
the overflow line is connected properly to the
integral relief valve.
• For pumps with diaphragm leakage sensor:
Check that the diaphragm leakage sensor is
functioning correctly.
Related information
3.2 Safety instructions and requirements for startup
3.3 Starting up the pump
3.3 Starting up the pump
3.4 Stopping and starting dosing
3.10 Setting the opening pressure of the integral
relief valve
11.1.4 Checking the diaphragm leakage sensor
11.2.2 Connecting the VFD to the power supply
11