Ac Line Connections; Vac Configuration - Baldor 18H Series Installation & Operating Manual

Section 1
General Information

AC Line Connections

380-400 VAC Configuration

MN718
Be sure all power to the control is disconnected before proceeding. If power has been
applied to the control, wait at least 5 minutes after power disconnect for residual voltage
across bus capacitors to discharge.
Reduced Input Voltage Derating
All power ratings stated in Section 7 are for the stated nominal AC input voltages (230,
460 or 575VAC). The power rating of the control must be reduced when operating at a
reduced input voltage. The amount of reduction is the ratio of the voltage change.
Examples:
For example, a 10HP, 230VAC control operating at 208VAC has a reduced power rating
of 9.04HP.
208VAC
+ 9.04HP
10HP
230VAC
Likewise, a 10HP, 460VAC control operating at 380VAC has a reduced power rating of
8.26HP.
380VAC
+ 8.26HP
10HP
460VAC
To obtain the full output rating of 10HP in either case requires a 15HP Control.
Size A and B controls may be used directly with a 380-400 VAC power source,
control modification is not necessary.
Size C, D, E, F and G controls all require modification for operation on the reduced line
voltage (380-400VAC).
Tap Change Procedure (size C, D, E and F controls).
1. Be sure drive operation is terminated and control is disabled.
2. Remove all power sources from the control. If power has been applied, wait at
least 5 minutes for bus capacitors to discharge.
3. Remove or open the front cover.
4. Remove the wire from terminal 5.
5. Place the wire that was removed from terminal 5 onto terminal 4.
6. Install or close the front cover.
Receiving & Installation 3-13