Piercing Pins
Flat cable, protected against polarity reversal
The power bus supplies the Rapid Link function
modules with main and auxiliary power. Plug-in tap-off points can be
quickly and safely connected at any point along the bus. The power bus
can consist either of a flexible busbar (flat cable) or standard round
cables:
- The flexible busbar RA-C1 is a 7-core flat cable (cross-section
2.5 mm2 or 4 mm2) and has the following structure:
- For the power bus you can also use conventional round cables
(cross-section 7 × 2.5 mm2 or 7 × 4 mm2, outer core diameter < 5 mm,
flexible copper conductor to IEC/EN 60228) with round cable feeders
RA-C2. The cable can have an external diameter of 10 to 16 mm.
Warning!
- Rapid Link must be operated only on three-phase systems with
earthed star point and separate N and PE conductors (TN-S network).
It must not be operated unearthed.
- All devices am connected to the power and data bus must also
meet the requirements for safe isolation according to IEC/EN 60947-1
Annex N or IEC/EN 60950. The 24 V DC power supply unit must be
earthed on the secondary side. The 30 V DC PSU for the
AS-Interface®-/RA-IN-power supply must meet the safe isolation
requirements according to SELV.
The power sections are supplied through disconnect control unit RA-DI
(see illustration below) with:
- Ie =
20 A/400 V at 2.5 mm2
- Ie = 20 to 25 A/400 V at 4 mm2.
- Round cables up to 6 mm2 can be
used to feed power to disconnect control unit RA-DI.
Disconnect control unit RA-DI protects the cable from overload and
provides short-circuit protection for the cable as well as all
connected RA-MO motor control units.
The combination of RA-DI and RA-MO fulfills the requirements of
IEC/EN 60947-4-1 as starter with type “1” coordination. That means
that the contactor’s contacts in the RA-MO are allowed to weld in
the event of a short-circuit in the motor terminal strip or the
motor supply cable. This arrangement also conforms to IEE wiring
regulations.
The affected RA-MO motor control unit must be replaced after a
short-circuit!
When you configure a power bus with a disconnect control unit,
observe the following:
Even in the event of a 1-pole short-circuit at the line end, the
short-circuit current must exceed 150 A.
The total current of all running and simultaneously starting motors
must not exceed 110 A.
The total load current (about 6 × mains current) of all connected
speed control units must not exceed 110 A.
Observe the voltage drop in your specific application.
Instead of the disconnect control unit, you can use a 3-pole
miniature circuit-breaker In ≤ 20 A and B or C characteristic. Here,
you must observe the following:
The let-through energy I²t in the event of a short-circuit must not
exceed 29 800 A2s.
Therefore the short-circuit current Icc at the mounting location
must not exceed 10 kA → characteristic curve.
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