Connection – Rockwell Automation 937CU-DIFRQ_1 Universal Frequency Converter Installation Instructions User Manual
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Bul. 937
C Universal Frequency Converter Installation Instructions
Connection
The removable terminals of the Bulletin 937 Converters simplify the
connection and the switch cabinet assembly. They make it possible to
replace devices quickly and without error if a customer service becomes
necessary.
Terminals are equipped with screws, are self-opening, have a large
connection area for a wire cross-section up to 2.5 mm2/14 AWG and
coded plugs, making it impossible to mix them up.
The intrinsically safe field circuit is connected to the blue
terminals 1 and 3. These may be guided into the potentially
explosive areas with connector cables in accordance with
DIN EN 60079-14. Terminal 2 is always left unconnected.
The non-intrinsically safe field circuit is connected to
terminals 1 through 3.
You can connect:
• A sensor corresponding to DIN EN 60947-5-6
(NAMUR)
• A mechanical contact
For sensors that do not have the appropriate internal
resistors, you can add the following externally (as close as
possible to the sensor):
• A series resistor for short circuit monitoring
In reference to these monitoring options, please see also
Units.
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