Table of Contents
Advertisement
16 Operation principle and hardware description
16 Operation principle and hardware description
Main circuit diagram
Main circuit diagram
￭
The figure shows a simplified main circuit diagram of the rectifier bridge.
The figure shows a simplified main circuit diagram of the rectifier bridge.
1
AC fuses
1.
AC fuses
2
Diodes
2.
Diodes
Implementing DC voltage measurement
￭
Implementing DC voltage measurement
The control program needs a measured voltage value:
The control program needs a measured voltage value:
•
for the control of the charging circuit at the power up
•
for the control of the charging circuit at the power up
•
for overvoltage and undervoltage monitoring and protection.
•
for overvoltage and undervoltage monitoring and protection.
The supply unit does not have DC voltage measurement as standard. The cabinet
The supply unit does not have the DC voltage measurement as standard. The cabinet
installer must implement it separately. The cabinet installer can, for example:
installer must implement it separately. The cabinet installer can, for example:
1.
connect the DC voltage measurement of the inverter unit to the supply unit via a
1. connect the DC voltage measurement of the inverter unit to the supply unit via a fiber
fiber optic link between DDCS communication modules. For more information,
optic link. For more information, see
see
Start-up (page
circuit diagrams
firmware manuals.
2. connect the DC voltage measurement of the inverter unit to the supply unit via the
2.
connect the DC voltage measurement of the inverter unit to the supply unit via
analog output of the inverter unit and analogue input AI2 or AI1 of the supply unit. For
the analog output of the inverter unit and analogue input AI2 or AI1 of the supply
more information, see
unit. For more information, see
on page 169, and the relevant firmware manuals.
diagrams (page 153)
3. use a separate voltage measurement device (transducer), and connect it between the
3.
use a separate voltage measurement device (transducer), and connect it between
drive DC link and analogue input AI2 or AI1 of the supply unit.
the drive DC link and analogue input AI2 or AI1 of the supply unit.
You can use alternatives 1, 2, or 3 for a single drive, in other words, for a drive that consist
You can use alternatives 1, 2, or 3 for a single drive, in other words, for a drive that
of one supply unit and one inverter unit. For multidrives (one supply unit feeds several
consist of one supply unit and one inverter unit. For multidrives (one supply unit feeds
inverters), use alternative 3.
several inverters), use alternative 3.
Charging
Charging
￭
A charging circuit powers up the DC link capacitors of the drive system smoothly.
A charging circuit powers up the DC link capacitors of the drive system smoothly.
Discharged capacitors cannot be directly connected to the full supply voltage. The
Discharged capacitors cannot be directly connected to the full supply voltage. The
charging current must be limited until the capacitors are charged and ready for normal use.
charging current must be limited until the capacitors are charged and ready for normal
If the diode supply unit is equipped with a charging circuit, the DC voltage level must be
use.
signaled to the control unit either through analog input AI2 (AI1) or fiber optic connection
2
1
2
75),
Example circuit diagrams (page 153)
on page 169, and the relevant firmware manuals.
Setting the parameters
Start-up (page
and the relevant firmware manuals.
Setting the parameters
on page 84,
75),
Example circuit
+
+
U
U
c
c
-
-
on page 84,
Example
and the relevant
Example circuit diagrams
Advertisement
Table of Contents
