ABB ACSM1 - Braking Chopper; Low Voltage Mode

Drive control and features
48
Automatic identification of the supply voltage is performed every time the drive is
powered. Automatic identification can be disabled by parameter 47.03
SUPPLVOLTAUTO-ID; the user can define the voltage manually at parameter 47.04
SUPPLY VOLTAGE.
The intermediate DC circuit is charged over an internal resistor which is bypassed
when the capacitors are considered charged and the voltage has stabilized.
Braking chopper
The built-in braking chopper of the drive can be used to handle the energy generated
by a decelerating motor.
When the braking chopper is enabled and a resistor connected, the chopper will start
conducting when the DC link voltage of the drive reaches U
DC_BR
- 30 V. The
maximum braking power is achieved at U
DC_BR
+ 30 V.
U
DC_BR
= 1.35 × 1.25 × 1.19 USED SUPPLY VOLT.
Low voltage mode
A Low voltage mode is available to extend the supply voltage range. When the mode
is enabled, the drive can operate below the nominal range, for example when it
needs to be powered from an emergency supply.
Low voltage mode can be activated by parameter 47.05 LOW VOLT MOD ENA. Low
voltage mode introduces parameters 47.06 LOW VOLT DC MIN and 47.07 LOW
VOLT DC MAX for adjustment of minimum and maximum DC voltage control levels
respectively. The following rules apply:
• 47.06 LOW VOLT DC MIN = 250 to 450 V
• 47.07 LOW VOLT DC MAX = 350 to 810 V
• 47.07 LOW VOLT DC MAX > 47.06 LOW VOLT DC MIN + 50 V.
1.07 DC-VOLTAGE
Undervoltage control level (0.8 × U
DC
; 400 V min.)
Undervoltage trip level (U
DC
, low - 50 V; 350 V min.)
Overvoltage control level (1.25 × U
DC
; 810 V max.)
Overvoltage fault level (U
DC
, high + 70 V; 880 V max.)
U
DC
= 1.35 × 1.19 USED SUPPLY VOLT
U
DC
, high = 1.25 × U
DC
U
DC
, low = 0.8 × U
DC