67525-B is a Reliance DC analog tachometer generator dedicated for SCR DC drive closed-loop speed feedback system. Original production discontinued, available stock includes surplus new original spare parts and fully tested refurbished units for old metallurgy, paper mill DC drive maintenance replacement. It belongs to 67525 general series, interchangeable with 67525-A/67525-C variant products with identical mounting dimension and shaft specification.

67525 is base part number of Reliance analog tach generator platform. Suffix B stands for customized winding parameter and output voltage grade; different suffix letters only modify internal coil turns and rated output voltage, keeping outer outline, mounting flange and drive shaft dimension consistent across series variants.

Max continuous rated speed 2500RPM, nominal output voltage 100VDC at rated rotating speed; internal armature resistance 195Ω ±5%. Working ambient temperature -20℃~+70℃, storage temperature -40℃~+85℃, non-condensing humidity 5%~95%. Insulation withstand voltage between winding and housing 1400VAC, insulation resistance above 1000MΩ. Mechanical service life over 25000 working hours under rated operating condition, conforms to UL industrial component certification.

Adopts flange fixed installation plus solid single-ended drive shaft structure, directly coupled with DC motor rear extension shaft. Two bare lead wire outgoing wiring without plug connector, all analog DC voltage signal transmits via hard wiring to drive control board feedback terminal. No digital bus communication port reserved, only analog voltage speed signal output.

Converts motor rotating speed into proportional DC analog voltage signal, feeds real-time speed value back to Reliance SCR drive main control unit for closed-loop speed regulation. When abnormal tach signal loss or open circuit occurs, drive triggers speed loss protection to lock main power output and prevent motor overspeed runaway.

Matching Reliance high-power DC drive motors used in steel rolling line, paper machine drying cylinder drive and chemical large DC pump equipment, core spare part for legacy Reliance analog DC drive system overhaul and retrofit upgrade.

Cut off equipment main power and wait more than 20 minutes for residual voltage discharge before disassembly and wiring work. Annual maintenance: clean coupling dust with dry low-pressure air, inspect shaft wear and lead wire insulation ageing. When drive appears unstable speed swing or speed feedback fault alarm without motor mechanical failure, measure tach output voltage change with rotating speed first before replacement; avoid axial impact on drive shaft during installation to prevent internal armature deformation damage.