Appendix A Technical Data; Ratings - Unitronics UMI-B1 UL Series Operation Manual

UMI-B1 UL Series Inverter

Appendix A Technical data

A.1 Ratings
A.1.1 Capacity
Inverter sizing is based on the rated motor current and power. To achieve the rated
motor power given in the table, the rated current of the inverter must be higher than or
equal to the rated motor current. Also the rated power of the inverter must be higher than
or equal to the rated motor power. The power ratings are the same regardless of the
supply voltage within one voltage range.
Note:
1. The maximum allowed motor shaft power is limited to 1.5 x PN. If the limit is exceeded,
motor torque and current are automatically restricted. The function protects the input
bridge of the inverter against overload.
2. The ratings apply at ambient temperature of 104° F (40° C).
3. It is important to check that in common DC systems the power flowing through the
common DC connection does not exceed PN.
A.1.2 Derating
The load capacity decreases if the installation site ambient temperature exceeds 104° F
(40° C), the altitude exceeds 3281ft (1000m) or the switching frequency is changed from
4 kHz to 8, 12 or 15 kHz.
A.1.2.1 Temperature derating
In the temperature range 104~122° F (+40° C–+50° C), the rated output current is
decreased by 1% for every additional 1.8° F (1° C). Refer to the below list for the actual
derating.
A.1.2.2 Altitude derating
The device can output rated power if the installation site below 3281ft (1000m). The
output power decreases if the altitude exceeds 3281ft (1000m). Below is the detailed
decreasing range of the derating:
Derating coefficient (%)
100
80
60
40
20
14 32 50 68 86 104 122
131
Appendix A Technical data
Temperature (° F)