Warner Electric SFC-120, SFC-170, SFC-250, SFC-400 Bearing Mounted, Flange Mounted - Manual (Page 10)

10 Warner Electric • 800-825-9050 P-200
• 819-0481
D. Mounting the Armature Assembly
1. SFC 250 and 400 size units.
Insert a key in the keyslot of the shaft and slide the
armature assembly onto the shaft.
2. (SFC120 do not use keyway)
Position the assembly to allow a gap of about 1/64
inch between the faces of the armature and magnet.
The overall axial dimension should be in accordance
with the dimensions specified on the illustration
drawings.
3. Secure the assembly in this position by alternately
tightening the two setscrews in the hub.
4. The hub may need to be repositioned as wear
occurs with time.
Electrical Coil Data
Unit Size SF/SFC 120 SF/SFC 170
Voltage – DC 6 24 90 6 24 90
Resistance @ 20°C — Ohms 6.32 104 1386 6.96 111.2 1506
Current — Amperes .949 .230 .065 .861 .215 .060
Watts 5.69 5.52 5.85 5.85 5.16 5.37
Coil Build-up — Milliseconds 12 12 11 17 17 16
Coil Decay — Milliseconds 8 8 7 8 7 6
Unit Size SF/SFC 250 SF/SFC 400
Voltage – DC 6 24 90 6 24 90
Resistance @ 20°C — Ohms 5 76.4 1079 4.88 73 1087
Current — Amperes 1.2 .314 .084 1.23 .322 .083
Watts 7.2 7.5 7.51 7.39 7.96 7.45
Coil Build-up — Milliseconds 48 48 44 154 154 154
Coil Decay — Milliseconds 15 15 13 62 60 55
Notes: Build-up time equals current to approximately 90% of steady state value and flux to 90%.
Decay time equals current to approximately 10% of steady state value and flux to 10%.
Approximately because current leads or lags flux by a small amount.