bonitron M3645P, Reference Manual

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User’s Manual
31
4.
O
PERATION
4.1.
F
UNCTIONAL
D
ESCRIPTION
The M3645P regenerative DC bus power supply enables energy being generated by
an overhauling motor to be efficiently returned to the power grid. It also supplies power
to one or more drives through their DC bus terminals.
M3645P synchronizes to the frequency of the attached power line, automatically
adapting to 50Hz or 60Hz. During motoring, the unit acts as a passive six-pulse
rectifier with an internal 5% reactor. As the DC bus rises above the AC line peak, the
unit drives current from the DC bus into the AC line to limit the rise in bus voltage.
During regeneration the unit is self-limiting, and will automatically fold back or shut
down in the event that unsafe conditions are detected.
An optional digital display shows information about the
power supply’s present status
and history. Fault records and a lifetime count of energy regenerated are stored. On
units without digital displays, system information is presented via three color LEDs.
4.2.
F
EATURES
4.2.1.
D
IGITAL
D
ISPLAY
The optional display is a four-line, eighty-character LCD which shows
information about the present status of the unit, as well as records of faults
and energy throughput.
4.2.2.
LED
S
Red, yellow, and green LEDs indicate the status of the unit.
4.2.2.1.
P
OWER
(G
REEN
) I
NDICATOR
The green LED indicates that the unit is powered on.
4.2.2.2.
R
EGEN
A
CTIVE
(Y
ELLOW
) I
NDICATOR
The yellow LED indicates that the unit is actively regenerating power back
to the line.
4.2.2.3.
N
OT
R
EADY
(R
ED
) I
NDICATOR
The red LED indicates that the unit is not ready to regenerate. The red
LED will be off during normal operation.
On units with a digital display, the red LED will illuminate if a fault has
occurred, or if the unit’s enable input (4.5.2) is not activated. In case of a
fault, the display will indicate the nature of the fault.
On units without a digital display, the red LED turns on solid if the enable
input (4.5.2) is not activated. If any faults are present, the red Not Ready
LED will blink out a code indicating the present fault (Table 4-1).
Note that neither condition will prevent the unit from operating as a power
supply. Only the regeneration functions are affected by faults or the
enable signal.
4.2.3.
B
UTTONS
Up , down , left , right , cancel , and enter buttons are present on the face of
Regen units equipped with a digital display. The function of each button
depends on the active screen. See Section 4.3 for details.