bonitron M3452, Customer Reference Manual

Page: 28 / 80

M3452 vR7 EIP/PDP
28
4.2.1.3.
A
CTIVE
B
RAKING
This red indicator illuminates when the chopper IGBT is on. When the
drive is idle, this red light should not be on. During braking, this red light
will be on or flashing, depending on the amount of braking energy.
This red light will also be on if the Bus Discharge input is active.
4.2.2.
T
ERMINAL
S
TRIP
I/O
NOTE!
Digital Terminal strip I/O is prewired to the modular I/O module, and is
listed here only for reference. All digital I/O operations should be carried
out using the network interface.
4.2.2.1.
C
ONTROL
S
IGNAL
–
TB2-11&12
These terminals are used for the Master/Slave communication port used
in multiple unit configurations. The signals of all modules are connected
in a “daisy chain” ( + to +, - to - ).
The port is bidirectional, serving as an output for modules operating in the
Master mode, inputs for modules operating in the Slave mode.
The signal is a complex waveform that is not reproducible as an analog
input or output.
See Section 4.2.3 for further information on Master/Slave configurations.
WARNING!
Do not attempt to use these signals for any purpose other than
interconnecting Bonitron M3452 with R7 or R7E units! Damage may occur
to the M3452 as well as to the connected equipment!
4.2.3.
M
ASTER
/ S
LAVE
C
ONTROL
(200 A
MP TO
1600 A
MP
)
In order to achieve current ratings higher than possible with a single module,
several braking modules can be connected in parallel. This method requires
that one module be in control of all other modules. This module is considered
the Master and the others are slaved to it.
Each module must have its own dedicated load bank!
If the output of modules is wired in parallel, severe current imbalances will
damage the units.
Parallel modules do not have to have the same current rating; however, each
module
must have a load resistor appropriate for the individual module’s
current rating.
Up to 10 additional modules can be driven from a Master module if all Slave
modules are within close proximity of the Master module.
In this configuration, any module can be selected as the Master module, and
can be changed
“on the fly” remotely.
WARNING!
AT NO TIME should more than one Master be selected simultaneously. If
multiple masters are selected, all but one will detect the condition and
cease operation. This fault can only be cleared by powering down the
system and powering back up with only one master module. Ensure that
the logic control will select only one Master at any given time.