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Unidrive M Regen Design Guide 341
Issue Number: 4
REGENERATIVE OPERATION
Drives can be configured as an AC Regenerative Unit (also known as a Regen drive). Regen operation allows bi-directional power flow to and from
the AC supply. The AC supply voltage must not exceed 600 Vac.
In these systems the inverter output is connected to the AC supply via a reactor and switching frequency filter. The drives are required to be protected
by listed branch fuses as specified in the installation instructions. For grid feed applications, further evaluation may be required to other standards,
such as, but not limited to UL1741, CSA C22.2 No. 107.1-01, IEEE 1547 etc.
13.7 Motor overload protection and thermal memory retention
All drives incorporate internal overload protection for the motor load that does not require the use of an external or remote overload protection device.
The protection level is adjustable and the method of adjustment is provided in the relevant Control User Guide. Maximum current overload is
dependent on the values entered into the current limit parameters (motoring current limit, regenerative current limit and symmetrical current limit
entered as percentage) and the motor rated current parameter (entered in amperes).
The duration of the overload is dependent on motor thermal time constant. The maximum programmable time constant depends on the drive model.
The method of adjustment of the overload protection is provided.
The drives are provided with user terminals that can be connected to a motor thermistor to protect the motor from high temperature, in the event of a
motor cooling fan failure.
13.8 External Class 2 supply
The external power supply used to power the 24 V control circuit shall be marked: "UL Class 2". The power supply voltage shall not exceed 24 Vdc.
13.9 Modular Drive Systems
Drives with DC+ and DC- supply connections, rated 230 V or 480 V have been investigated for use in Modular Drive Systems as inverters when
supplied by the converter sections from the Unidrive-M range. In these applications the inverters are required to be additionally protected by
supplemental fuses.
Alternatively, the inverters may be supplied by converter models: Mentor MP25A, 45A, 75A, 105A, 155A or 210A.
Contact the supplier of the drive for more information.
13.10 Requirement for Transient Surge Suppression
This requirement only applies to Frame Size 7 drives with rated input voltage = 575 V.
TRANSIENT SURGE SUPPRESSION SHALL BE INSTALLED ON THE LINE SIDE OF THIS EQUIPMENT AND SHALL BE RATED 575 Vac
(PHASE TO GROUND), 575 Vac (PHASE TO PHASE), SUITABLE FOR OVERVOLTAGE CATEGORY III, AND SHALL PROVIDE PROTECTION
FOR A RATED IMPULSE VOLTAGE TO WITHSTAND VOLTAGE PEAK OF 6 kV AND A CLAMPING VOLTAGE OF MAXIMUM 2400 V.
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