|
Engineering
The Rapid Link function modules are installed immediately adjacent to the drives. They can be connected to
the power and data bus at any point without having to interrupt the bus.
The AS-Interface® data bus is a system solution for networking different modules. AS-Interface®
networks are quick and easy to implement.
AS-Interface® uses a geometrically coded, unscreened flat cable with a cross-section of 2
× 1.5 mm2.
It is used to transmit both power as well as all data traffic between PLC and I/O and – to some extent –
supplies the connected devices with energy.
The installation meets the usual requirements. Engineering is simplified by full flexibility in system layout and
mounting.
When a link is connected to the flat cable, two metal pins pierce through the cable’s jacket and into the two
cores to establish a contact with the AS-Interface® cable. There is no need to cut and
strip cables, apply ferrules or connect individual cores.
  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 I˛t
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.
|
