Unidrive M/HS Frame 7 to 10 Power Installation Guide 123
Safety information Product information Mechanical installation Electrical installation Technical data
UL lnformation
6.7 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.
6.8 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.
6.9 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.
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