11
Equipment Description
Powered by Safety
®
01.4IB.48070A
d. cIrcuIt BreAker MonItor (cBM) operAtIon
The CBM, when powered and properly
connected to the devices on a circuit breaker,
will provide direct or indirect measurement of
parameters for the following:
1. Primary contact touch time.
2. Primary contact part time.
3. Spring charge time.
4. Close coil armature time (via algorithms in
BreakerView).
5. Trip coil armature time (via algorithms in
BreakerView).
6. Supply voltage values and fluctuations.
7. Phase temperatures on lower primaries
near sliding contact.
8. CBM internal ambient temperature.
The CBM will directly provide for basic alerts for
those parameters not requiring BreakerView
algorithms. These alerts will be visually
indicated by the EIM's LED color.
The CBM measures the parameters of voltages,
currents (charging motor and coils), contact
timing, and temperatures then performs
calculations to determine the circuit breaker
health.
e. IrIM operAtIon
The IRIM (Infrared Interface Module) is the
interface between the CBM's proprietary
infrared communications link to ModBus RTU
(RS-485) and USB communications interfaces.
It also indicates the circuit breaker health
through the EIM LED.
1) Infrared Communication Interface
Infrared (IR) communication is used to
connect the IRIM and CBM. This is a "line-
of-sight" interface that avoids the need
for additional wiring in the circuit breaker
control plug for communication purposes.
It uses an adaptive IR protocol to ensure
reliable, high speed communication
over distances varying from 1 inch
and approximately 18 inches. If the
communication link between the IRIM and
CBM is interrupted the EIM, connected to
the IRIM, will indicate this.
2) IRIM Operation
Figure 9 shows a block diagram of the circuit
breaker, CBM, associated components
and two communication interfaces. The
IRIM and EIM combination provides an
isolated RS-485 interface for Modbus RTU
communication and a mini USB connector
for direct USB communication to a local
computer. The IR communication between
the IRIM and CBM is shared between these
two interfaces with the USB taking priority.
3) Communication Interfaces
a. RS-485 Interface - This interface
supports the Modbus RTU protocol.
The "GND ISO" (pin 3) should be
connected to the RS-485 cable shield
and not a local ground. Refer to RS-485
wiring details for more information.
The default interface parameters are
Modbus ID #1, 115200 baud, 8 data
bits, no parity and 1 stop bit. The
Modbus ID and baud rate can be
adjusted using Powell's IRIM production
assistant software. The IRIM supports
the following baud rates: 9600, 19200,
38400, or 115200.
b. USB Interface - This is used to make
a direct connection between the CBM
and a local Microsoft® Windows based
computer running Powell's software
(eg. BreakerView). A USB driver
may be required for this interface,
this can be downloaded from
breakerview.powellind.com. Once
installed this driver is automatically
configured.
To Next Page
Loading...