Safety
information
Introduction
Product
Information
System
design
Mechanical
Installation
Electrical
Installation
Getting
started
Optimization Parameters
Technical
data
Component
sizing
Diagnostics
UL
Information
Unidrive M Regen Design Guide 171
Issue Number: 4
The Output Power (05.003) is the power flowing via the AC terminals of the drive. The power is derived as the dot product of the output voltage and
current vectors. For Regen mode a positive value of power indicates power flowing from the supply to the Regen drive.
DC Bus Voltage (05.005) gives the voltage across the DC bus of the drive.
Rated Current (05.007) is used to define rated operating conditions for Regen inductor thermal protection. See Inductor Thermal Time Constant
(04.015).
Maximum Switching Frequency (05.018) should be set to the required PWM switching frequency. The drive inverter will operate at this frequency
unless the inverter temperature becomes too hot. Under these conditions the drive will reduce the switching frequency in an attempt to avoid tripping
(see Auto-switching Frequency Change (05.035)). The actual switching frequency is shown in Switching Frequency (05.037). The switching
frequency has a direct effect on the sample rate for the current controllers (see Current Controller Kp Gain (04.013)). All other control tasks are at
a fixed rate.
D.c. Bus Voltage High Range (05.023) provides voltage feedback that has lower resolution and a higher range than D.c. Bus Voltage (05.005), and so
it is possible to determine the DC bus voltage even if this exceeds the level of the over-voltage trip. It should be noted that due to tolerances, D.c. Bus
Voltage High Range (05.023) may not correspond exactly with the level given by DC Bus Voltage (05.005). In a system with parallel power modules
where the control pod is remote from any of the power modules, this parameter always shows zero.
The drive inverter can be damaged if the temperature is too high. The inverter can also be damaged or the lifetime of the power devices reduced,
if the temperature ripple of the devices is too high. Auto-switching Frequency Change (05.035) defines the action taken if the drive inverter becomes
too hot or the temperature ripple becomes too high.
Enabled:
If the inverter becomes too hot or the ripple temperature is higher than the level defined by Maximum Inverter Temperature Ripple (05.039) the
switching frequency is reduced in an attempt to prevent tripping.
Disabled:
The switching frequency is not reduced, and so the drive will trip if the inverter is too hot or the temperature ripple is too high.
No Ripple Detect:
The switching frequency is reduced if the inverter temperature, but not the temperature ripple is too high. If the temperature ripple exceeds the level
defined by Maximum Inverter Temperature Ripple (05.039) then the drive will trip.
05.003 Output Power
RO Num ND NC PT FI
VM_POWER kW
05.005 DC Bus Voltage
RO Num ND NC PT FI
0 to VM_DC_VOLTAGE V
05.007 Rated Current
RW Num RA US
0.000 to VM_RATED_CURRENT A
Maximum Heavy Duty Rating (11.032)
05.018 Maximum Switching Frequency
RW Txt RA US
3 (1) kHz, 4 (2) kHz, 6 (3) kHz,
8 (4) kHz, 12 (5) kHz, 16 (6) kHz
3 (1) kHz
05.023 DC Bus Voltage High Range
RO Num ND NC PT FI
0 to VM_HIGH_DC_VOLTAGE V
05.035 Auto-switching Frequency Change
RW Txt US
Enabled (0), Disabled (1), No Ripple Detect (2)
Enabled (0)
To Next Page
Loading...
