User’s Manual
27
4.
O
PERATION
4.1.
F
UNCTIONAL
D
ESCRIPTION
The M3452 module controls the bus voltage of a variable frequency drive by
transferring energy to a resistor.
When the drive’s DC bus voltage exceeds a fixed setpoint, the heavy duty braking
transistor
’s control electronics turns on an IGBT transistor connecting a resistive load
across the DC bus. When the DC bus drops below another threshold, the IGBT turns
off. The setpoints are listed in Section 6.
4.2.
F
EATURES
For output and bus protection the M3452 includes a semiconductor fuse which limits
the energy in the case of a bus or control fault.
4.2.1.
I
NDICATORS
4.2.1.1.
DC
B
US
The amber DC bus indicator illuminates when the voltage between the
DC+ and DC- terminals is greater than 50VDC.
CAUTION!
Do not use this light as an indication that the DC bus is safe to work on!
Always check the DC bus with a working voltmeter before servicing
equipment, as the DC bus light may be broken!
4.2.1.2.
C
ONTROL
P
OWER
/
F
AULT
This green indicator illuminates when control power is applied to the unit.
A solid green light indicates that no faults are present and the control
circuit is functioning. A flashing green light indicates a fault, with the
pattern of flashing lights indicating the type of fault (see Table 4-1 below).
All faults latch until a reset signal is applied. See Section 4.2.2.1.8 for
more information about the reset input. The master/slave mismatch fault
will not reset until power-down.
The module keeps a record of the most recent fault encountered. To
access this record, open the enable input (4.2.2.1.2), and toggle the reset
input (4.2.2.1.8) three times. The fault LED will blink out the code of the
most recent fault. Re-enable the unit to resume normal operation.
Table 4-1: Fault Conditions Table
N
UMBER OF
F
LASHES
F
AULT
I
NSTRUCTIONS
I
/
O
P
OINT
*
1
Logic Voltage
Consult Troubleshooting
in Section 5
TB2 1&2
2
Overtemp
Wait for unit to cool
TB4 5&6
3
Short IGBT
Contact Bonitron
TB4 9&10
4
Overcurrent
Reset
TB4 13&14
5
Master / Slave
Mismatch
Reconfigure system with
only one Master
N/A
*These signals are all accessed via the RJ45 / DB9 connection if the R7EIP or R7PDP
option is utilized.
Summary of Contents for M3452
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Page 21: ...User s Manual 21 Figure 3 2 Customer Connections in M14 Chassis CUSTOMER I O CONNECTION ...
Page 24: ...M3452 vR7 EIP PDP 24 Figure 3 6 I O Hookup with R7 EIP PDP Communication ...
Page 26: ...M3452 vR7 EIP PDP 26 Figure 3 8 24VDC Power Connection ...
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Page 66: ...M3452 vR7 EIP PDP 66 Figure 6 3 M3452 K9 Chassis Dimensional Outline Drawing ...
Page 68: ...M3452 vR7 EIP PDP 68 Figure 6 5 M3452 M14 Chassis Dimensional Outline Drawing ...
Page 75: ...User s Manual 75 NOTES ...
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