Polyspede Adjustable Speed Drive System model PRD2-50 Option SI-1, T11, MOS 48429; circuit board marked E1489-11, contains Signal Isolator E1485-01; Rated at input 115 VAC, 1 Phase, 60 Hz, 14 A; Arm output 75 VDC, 6 A, 1/2 HP; field output 100 VDC, 2 A max; Used. Removed from working, decommissioned machine.
