Baldor mn722 manual Hardware changes for 380-400VAC operation

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.

Hardware Changes for Reduced Voltage Input

Size C+, D+,D, E, F and G+ controls all require modification for operation at a reduced line voltage (less than rated nominal). Table 3-8 defines the modifications for each enclosure size. Figure 3-1 shows the locations of the transformer locations for each enclosure size.

Table 3-8 Hardware changes for 380-400VAC operation

Enclosure	Control	Contactor	Fuse Block
Size	Transformer	Transformer	Connection
	Tap Change	Tap Change	Change
C+	Yes	No
D+	Yes	No
D	Yes	No
E	Yes	Yes
F	Yes	Yes
G+	No	Yes	Yes

3-12 Receiving & Installation MN722