Burkert Type 8620 - Manual (Page 25)

mxCONTROL Type 8620
Page 25
Dimensioning of fuses, line safety switches, overcurrent protection devices
Pay attention to correct design of the fuse and/or the line safety switch in the power supply line.
The L- and N-conductors have to be protected with overcurrent protection devices (max. 10 A) as e.g.
fuses, line safety switch etc.
Also install an equipment for the disconnection of L- and N-conductors from the power supply
near the „Type 8620 mxCONTROL“.
Therefor e.g. the above-mentioned overcurrent protection
device or an appropriate disconnecting switch (110/240 V and with at least the size of current of the
overcurrent protection device) can be used.
If the sum of extracted current of all connected actuators at the Power Supply part exceeds the
value of 10 A, the actuators can be connected with a separate voltage supply for those actuators -
please refer to the schemata in appendix 21.2 „Power Supply of Actuators/Sensors“.
Electrical Connections
The preferred mounting position for the „Type 8620 mxCONTROL“ is with the cable glands facing
downward, i.e. all cable glands are located at the bottom of the device.
→ The electrical connections can be accessed by loosening the screws that hold the lower cover
plate in place. You can then lift the cover plate by the black handle.
→ The terminal strips for the mains voltage level (power supply) and the low-voltage level
(instrumentation supply) are separated by an isolating plate (see Figure 4).
Mains voltage level
(Power supply PS)
(Hardware version 1) Low-voltage level
(Instrumentation
supply IS)
Isolating plate
(Hardware version 2)
Figure 4: Viewing the inside of the terminal strip compartment (with the cover plate removed) of the
„Type 8620 mxCONTROL“:
top: Hardware version 1: Screw terminals
bottom: Hardware version 2: Spring type terminals
→ Use suitable cables (for wire gauges/cross sections see chapter 7.5) for the passage through the
cable glands (for outside cable diameters and thermal stability of cable material refer to chapter
6.1, paragraph “Electrical connections”).
→ Unscrew the nut of cable gland and remove the seal.
→ First push the cable through the nut of the cable gland and the seal insert and then prepare each
wire of the cable with a cable end sleeve (see Figure 5) of the recommended length:
(cable for Power Supply:
sleeve length: 7 mm,
cable for Instrumentation Supply: sleeve length: 5 mm).