MK / MKT (E5) 03/2019 page 27/158
4.4.2 Connecting the voltage and frequency changer (for chambers equipped with a
voltage and frequency changer)
The voltage and frequency changer is supplied with a fixed power connection cable without a plug. It is
protected against excess-current with 3 internal overload releases. The connection is made by the cus-
tomer.
The socket must provide a protective conductor.
Electrical connection data:
• Input side: 480 V, 60 Hz, 4-wire
• Output side (to the chamber): 400 V, 50 Hz, 5-wire
To establish the electrical connection of the alternating climate chamber with the voltage and frequency
changer, proceed in the following order:
1. Connect the chamber to the connection socket (G) of the voltage and frequency changer
2. Establish the power connection of the voltage and frequency changer using the power cable (I)
3. Turn on the voltage and frequency changer at the power switch (H) (position “ON”)
4. Turn on the chamber with the main power switch (3) in the lateral control panel
Left side of the voltage and frequency changer
with connection socket (G) for the alternating climate
Right side of the voltage and frequency changer
with power switch (H) and power cable (I)
Figure 12: Voltage and frequency changer, mounted
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