Caterpillar — R448 Adjustment for Maximum Excitation
Adjustments · Voltage regulator R448
From a Caterpillar owner's manual covering: 3456, C1G1-Up, C2T1-Up, C3G1-Up, C4G1-Up, SR4B. Check it applies to your exact model before use.
Applies to: Caterpillar SR4B
Procedure
- Disconnect power supply wires X1, X2, Z1, Z2.
- Disconnect sensing leads 0V, 110V, 220V, 380V.
- Connect 200V-240V main power supply to X1 and X2.
- Install 10 Amp DC ammeter in series with exciter field.
- Turn P5 full counterclockwise and activate power supply.
- Turn P2 clockwise until stable current.
- Switch power off then on. Turn P5 to required maximum current.
- Maximum current must not exceed 10 Amperes.
Tools required
- 10 Amp DC ammeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Maximum current not greater than 10 Amperes
Full service-parts list: Caterpillar SR4B →
Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.