Schneider Electric ALTIVAR 58 TRX - Manual (Page 93)

Altivar ® 58 TRX AC Drives
Power Section Construction Information
93
09/2003 © 2000–2003 Schneider Electric All Rights Reserved
Block Diagram ATV58HD16M2 to ATV58HD46M2 (15 to 40 hp/50 hp VT 208/230 Vac) and
ATV58HD28N4 to ATV58HD79N4 (25 to 75 hp/100 hp VT 400/460 Vac)
The block diagram above provides an overview of the construction of the ATV58 TRX drive controller
power section. The drive controllers in the horsepower ranges referenced above are built in frame sizes
6 and 7. (See the dimensional drawings on pages 120 to 122.) These two frame sizes share many
components and technological advances:
• The option of having an input EMC filter mounted integrally in the product.
• An internally-mounted 3-phase line reactor.
• The diode bridge section consists of three modules each containing a diode and a thyristor. This
advanced diode/thyristor module is ASIC-controlled to gate on the thyristor to charge the DC bus
when power is initially applied to the unit. Once the DC bus is charged, the thyristor is gated on full
time and acts as a diode. This technological advance allows for elimination of the electromechanical
precharge relay. This improves product reliability and allows for reduced package size.
• The dynamic braking components are incorporated into one module, internally mounted in the
product.
• The output section consists of six insulated gate bipolar transistors (IGBTs) integrated into the power
module (PM). Frame size 6 integrates the six IGBTs into one power module, while frame size 7
contains three power modules with two integrated IGBTs each.
• Three current sensors are used on the output to monitor the current supplied to the motor. The
feedback from these sensors is used by the motor control algorithms.
Integration reduces the part count and the wiring and connection points required to connect
components. The power modules provide further integration by combining fault detection and short
circuit protection of the output transistors. The use of power modules also eliminates individual gate
drive cards and associated wiring used by most other manufacturers in this horsepower range. The drive
also incorporates a laminated bus network of power conductors for line, DC bus, and motor power with
connections made with screws instead of traditional cable connectors. These factors combine to make
the product fit in a smaller package while improving the reliability of the product.
+
L1
L2
L3
−
U
V
W
Optional
EMC
Filter
PA
PB
DBT
T1
T4
T3
T6
T5
T2
Diode
Bridge
Section Capacitor
Bank Dynamic
Braking
Transistor
3-Phase Current
Measurement
IGBT
Output
Section
Integrated
3-Phase
Line Reactor
B
lk
D
ia
g2
.e
ps