Magnetek 144-45117-R3 - Manual (Page 10)

Regenerative Power Module - September 2010
144-45117-R3
Page 10 of 20
Power Terminal Connections
TERM Function
L1+
DC Bus Positive
L2- DC Bus Negative
R1+ Resistor Positive
(Same potential as DC Bus Positive)
R2- Resistor Negative
(Switched Output)
R3+ Terminal must be connected to the external resistor whenever the
separate mounted RPM panel with the required additional
protective components is connected directly to the DC bus. See
FIGURE 4 for example connections.
External Power Connection
An external 24V supply may be connected to the brake chopper at pins 1 and 10. The internal 24 and 15
volt power supplies of the brake chopper is derived from the main DC bus input and takes approximately
50ms to start up. If it is necessary for the brake chopper to be active within less than 50ms of applying
the DC bus voltage an external power supply should be provided.
The external 24-volt DC supply is not needed on crane applications using the OmniPulse DDC.
Synchronization
Synchronization equalizes the power dissipation in the braking resistors.
When two or more brake chopper modules are connected to the same DC bus they should be
synchronized by linking together all of the SYNC signals on all modules and linking together a 0V
common from each module. See FIGURE 2 for connection.
When the DC bus voltage exceeds the voltage threshold of any of the brake choppers the SYNC signal
will turn all of them on. The DC bus voltage must fall below the voltage threshold of all choppers in
order for the synchronized modules to turn off.