11
en
Make sure that the surge tank can handle the maximum pressure of the system.
Check and adjust the precharge pressure before connecting the surge tank to the system.
If the surge tank is already connected, you will have to drain the system before you check and adjust the
precharge pressure. To avoid doing this, we suggest that you install an on-off valve between the connec-
tion to the tank and the system’s pipe.
To determine the precharge value for the surge tank you can use the following formula:
if in bar
➞
work pressure – 0.2 = precharge pressure
if in kPa
➞
work pressure – 20 = precharge pressure
6.2 Electrical Connection of Pump
The electrical connections must comply with current standards and regulations.
Make sure that the type of power source, the supply voltage and frequency match the ratings of
the TKS system shown in the rating plate. Provide suitable general protection against short cir-
cuits on the electrical power line.
WARNING : although the TKS system has single-phase power supply, the pump’s motor is always a
three-phase motor connected to 230 V. The missing phases are created by the converter. For further
information refer to chapter 12.
Before proceeding with these operations, make sure that all the connections (even those that are
potential-free) are voltage-free. Always disconnect the TEKNOSPEED converter from the power
supply before carrying out any operations on the system’s electrical or mechanical components.
After disconnection from the power source, wait at least 1 minute before carrying out any work on
TEKNOSPEED to allow the condensers in the internal circuit to discharge.
6.2.1 Differential Magneto-thermal Switch
If local regulations require the installation of a differential magneto-thermal switch, make sure it is of a
type that is suited to the system. Suitable switches are those having the characteristic curve for unidirec-
tional alternate and pulsating DC fault current (type A or C).
They can be identified by the presence of the following symbol:
6.2.2 Version with Cable and Plug
The TKS system is equipped with power cord and plug.
When installing the pump, make sure that the plug and corresponding outlet are easily accessi-
ble in case the system needs to be deactivated.
If the power cord is damaged, it must be replaced at a service center or by qualified personnel.
6.2.3 Input Filter
The TEKNOSPEED converter is equipped with an input filter according to the EMC directive.
6.2.4 Motor Overload Protection
The TEKNOSPEED converter has an incorporated overload protection which guarantees absolute protec-
tion when it is connected to motors featuring the same nominal protection as that of the converter. For
lower power motors an auxiliary protection is used (see chapter 6.2.5)
6.2.5 Motor Overtemperature Protection (PTC)
Some models may feature an extra protection (thermistor) in addition to the overload protection incorpo-
rated in the converter. The thermistor (PTC) is attached to the base of the terminal board and connected
through cables and mini-fastons. The corresponding dip-switch will be in the PTC Y position.
For further information refer to chapter 12.
6.2.6 Converter overtemperature protection
The TEKNOSPEED converter has an incorporated overtemperature protection.
