Nidec Unidrive M200 Schritt-Für-Schritt-Anleitung Seite 13

Opening of branch circuit
Opening of the branch-circuit protective device may be an indication that a fault has been interrupted. To reduce the
risk of fire or electric shock, the equipment should be examined and replaced if damaged. If burnout of the current
element of an overload relay occurs, the complete overload relay must be replaced.
Integral solid state short circuit protection does not provide branch circuit protection. Branch circuit protection must
be provided in accordance with the National Electrical Code (NEC), The Canadian Electrical Code, and any
additional local codes.
Motor overload protection and thermal memory retention
The devices incorporate solid state overload protection for the motor load. The protection levels are expressed as a
percentage of full-load current. Refer to the Control User Guide for further information.
In order for the motor protection to work properly, the motor rated current must be entered into Pr 06 or Pr 05.007.
The protection level may be adjusted below 150 % if required. Refer to the Control User Guide for further
information.
All models are provided with thermal memory retention.
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.
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.
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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Unidrive M200/M201/M300 Step By Step Guide
Issue Number: 3