Baldor 22H series, Installation & Operating Manual

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Section 1
General Information
3-12 Receiving & Installation MN722
Single Phase Operation
Single phase operation is not possible for Series 22H Line Regen Vector Controls.
Operating the Control at a Reduced Input Voltage
Series 22H Controls use a DC Bus regulation technique that provides full output voltage
(240VAC for 230VAC Controls; or 480VAC for 460VAC controls) for the full input voltage
range. However, at reduced input voltages the output current of the control may have to
be derated. Table 3-7 lists the % derating of the output current for various motor voltage
ratings and input power voltage levels to the control.
Table 3-7 Output Current Derating at Reduced Input Voltages (2.5KHz PWM)
Input Voltage % of Output Current after Derating
230VAC Control 460VAC Control 240/480VAC Motor 230/440VAC Motor 208/400VAC Motor
180VAC 340VAC 77% 84% 93%
190VAC 360VAC 82% 89% 98%
208VAC 400VAC 90% 99% 100%
230VAC 440VAC 100% 100% 100%
240VAC 480VAC 100% 100% 100%
For example:
A 460VAC Control that has a 400VAC input line can provide 90% of the rated current to a
480VAC motor. In the Section 6 specifications we find our example 10HP control is
ZD22H410-EL has a continuous current rating of 15 Amps. The derated current can be
calculated as follows: 15A x 90% = 13.5A derated value.