bonitron M3534-I3, Руководство для пользователей

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User’s Manual
23
4.
O
PERATION
4.1. F
UNCTIONAL
D
ESCRIPTION
The M3534 ride-thru voltage regulator monitors the DC bus of the attached variable
frequency drive (VFD) and provides power in a voltage controlled, current limited
supply directly to the filter capacitor section of the drive above the inverter stage.
During a power quality event the internal DC bus of the VFD drops. When this level
meets the DC bus threshold voltage of the M3534, power is delivered through blocking
diodes to hold up the voltage in the VFD bus. The M3534 regulates and boosts the
input voltage to the drive at a constant voltage.
In standby mode, when the incoming AC power is normal, the M3534 power
consumption is minimal.
4.2. M3534R O
PERATION FOR
F
ULL
O
UTAGE
P
ROTECTION
The M3534R can be used with an energy storage system to allow for protection
against full outages for up to 2 seconds. This storage is typically double layer
capacitors or ultracapacitors, but can be any DC power source that needs regulation
to attach to the DC input of a variable frequency drive.
In order to use an ultracapacitor storage bank for outage support, the capacitor bank
must be charged with a separate charger, such as the Bonitron M3528, as the M3534
does not have charging capabilities.
Refer to Section 7 for general guidelines on sizing a capacitor bank for full outage
protection.
4.3. O
PERATION
M
ODES AND
C
ONFIGURATION
4.3.1. N
ORMAL
O
PERATION
During normal operation, the M3534 will monitor the output DC bus. When the
output DC bus voltage goes below the DC bus threshold voltage, the M3534
will become active and regulate the output DC bus and attached drive to the
DC bus threshold voltage. As the input voltage drops, more current is required
to maintain the same output power. If the input voltage drops to the point where
the required output power makes the input current higher than the input current
limit, the M3534 will operate in current limit, and the output voltage will drop
according to the actual output load required by the drive.
This mode is activated by the Enable input. Refer to Section 4.4.1.1 for details
on configuring this input.
4.3.2. T
EST
M
ODE
The Test mode allows the M3534 to be tested during normal power conditions.
In this mode, the M3534 adjusts the DC bus threshold above the normal DC
bus threshold setpoint. This forces the M3534 to begin sourcing power and
driving up the DC bus voltage of the attached drive. When properly adjusted,
the test voltage will be approximately 17% higher than the DC bus threshold.
This level should not be high enough to overvoltage the attached drives or
cause braking systems to activate. If the drive is heavily loaded when the test
is done, the DC bus may not reach 17% above the threshold voltage due to
the current limiting feature.
This mode is activated by the Test input. Refer to Section 4.4.1.2 for details
on configuring this input.