3VL molded-case circuit breaker
4.2 COM20 connection
3WL/3VL circuit breakers with communication capability - PROFIBUS
102
System Manual, 03/2011, A5E01051353-02
Tightening torque
0.8...1.2 Nm
Solid
1 x 0.5...4 mm
2
; 2 x 0.5...2.5 mm
2
Finely stranded with end sleeve
1 x 0.5...2.5 mm
2
; 2 x 0.5...1.5 mm
2
AWG cable (solid)
1 x AWG 20 to 12;
2 x AWG 20 to 14
Conductor cross-sections
AWG cable (finely stranded)
1 x AWG 20 to 14;
2 x AWG 20 to 16
Note
Transmission line
It is recommended to transfer the ZSI signal via a twisted-pair signal line with a cross-section
of at least 0.75 mm
2
. The maximum length must not exceed 400 m. Recommended cable
type: Shielded MSR cable LSYCY (2 x 0.75 mm
2
); made by: Siemens
Note
The motorized operating mechanism must be in automatic mode for switching via
PROFIBUS DP!
4.2.8
LED indicators on the COM20
To monitor whether the COM20 is ready for operation and data exchange is taking place,
three LEDs designated TRIP UNIT, PROFIBUS and DEVICE are located on the front cover
of the COM20. The operating statuses explained in the tables below can be read from these
LEDs.
DEVICE LED
The DEVICE LED provides information on the status of the COM20.
Table 4- 5
DEVICE LED
DEVICE LED
Meaning
Off
No voltage on the COM20
Green steady light
COM20 is supplied, there is no fault, no addressing plug is
connected
Steady yellow light
The addressing plug is connected; the address setting has not
yet been read or stored in non-volatile memory.
Flashing yellow
The addressing plug is connected; the address setting has
been read and stored in non-volatile memory.
Flashing red
The addressing plug is connected and has a fault.
Red rapid flashing
COM20 has a serious internal fault