Lenze 520 Series - Installation; Operation with Brake Chopper

56 4Q - DC Chopper 520 series
6.3 INSTALLATION
The following installation is compulsory:
- Connect the terminals 22 of all devices and terminals 33 of all devices.
- Lead the DC bus connections of the devices, terminals ±UG/RB1 and -UG via
fuses to one central point. Data and recommended fuses can be obtained from
chapter 6.1. The fuses must be able to interrupt a DC current. They must be
selected accordingly.
- Motor lines must be protected by overcurrent releases. Data and recommended
types can be obtained from chapter 6.1. Select cross-sections of the lines
according to the suitable fuses and VDE 0100.
- The mains connection of the devices must be according to the rated power of the
device. Cross-sections of the lines and fuses must be selected according to VDE (
0100.
- Every controller must be connected to a suitable balaneing choke, since the
internal mains input rectifier have different on-state voltages. Use two-pole
chokes. (see 6.2). Take care of the mains chokes contacts.
- A simultaneous mains connection of all devices must be possible.
- The connection must be done according to the circuit diagram under 6.5.
6.4 OPERATION WITH BRAKE CHOPPER
The brake chopper of the connectedcontrollers may be operated with specific
permanent brake power (~BR peak> or the suitable permanent brake current (‚BR
peak) (see 5.1>. The actual brake power results from the total power of the DC bus
connection.
The brake power is the positive difference between the total of all drives, either
operating in the generator or the motor mode. If a negative difference results, the
drives operating in the motor mode are dominant and the system must consume
power from the mains.
For overcurrent release see chapter 5.4.3.
Lenze