User’s Manual
19
4.
O
PERATION
4.1.
F
UNCTIONAL
D
ESCRIPTION
The M3575T 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 dynamic braking
transistor module
’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 standard turn on setpoint for the M3575T is 375VDC for 230VAC systems,
620VDC for 400VAC systems, and 750VDC for 460VAC systems. See Section 2.2
Special Options for non-standard turn on voltages.
4.2.
F
EATURES
4.2.1.
I
NDICATORS
4.2.1.1.
DC
B
US
The green DC Bus indicator illuminates when the voltage between the
DC+ and DC- terminals is greater than 40VDC.
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.
A
CTIVE
B
RAKING
The red indicator illuminates when the chopper IGBT is on. When the
drive is idle, this light should not be on. During braking, this light will be
on or flashing, depending on the amount of braking energy.
4.2.2.
T
ERMINAL
S
TRIP
I/O
See Figure 3-1.
4.2.2.1.
S
TATUS
C
ONTACTS
The Status Contacts TS 5&6 will be closed unless there is a fault.
These contacts OPEN on the following conditions:
Failed IGBT (power transistor)
Open Load
Overtemperature in module
If one of these conditions exists, the module will not operate, and the DC
bus will not be regulated through the braking resistor.
CAUTION!
Bonitron braking transistor modules are designed to be used with
stand-alone or common DC bus drive/inverter systems with bus
capacitors. When using the Bonitron modules on common bus
systems, special considerations may apply. Refer to and review the
Application Notes found in Section 7.1.3 prior to energizing this type
of system!
Summary of Contents for M3575T
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Page 17: ...User s Manual 17 3 6 TYPICAL CONFIGURATIONS Figure 3 2 Typical Power Interconnection Diagram ...
Page 31: ...User s Manual 31 Figure 6 3 B5 Chassis Dimensional Outline Drawing ...
Page 34: ...M3575T 34 6 8 BLOCK DIAGRAM Figure 6 7 Block Diagram ...
Page 38: ...M3575T 38 Figure 7 1 Typical Status Contact Wiring with Input Contactor ...
Page 39: ...User s Manual 39 Figure 7 2 Typical Status Contact Wiring with Drive Interlock Control ...
Page 41: ...User s Manual 41 NOTES ...
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