Control Techniques Emerson Focus 1

Page 63
Solution #2 – Isolation Transformer
Transformer KVA = 1.5 x Rated Armature Current x 120 Vac (or 240)
Example: Your DC Motor has a 10 A armature
KVA = 1.5 x 10 A x 120 Vac = 2.4 KVA (use 2.5 KVA)
DO NOT CONNECT GROUND
TO TRANSFORMER SECONDARY
Focus 1
DC Motor
Controller
L1
L2
L1
L2
A2
A1
M