Constant Speed Controller
This system enables the train to maintain a constant speed automatically and can be activated at any speed above 5 KMPH by pressing illuminated push button ‘BPCS’.
The control electronics and GTO controls the constant speed by giving tractive or braking effort to the TM as per requirement irrespective of position of throttle (ATDC-Angle transmission driver Controller) i.e. TE/BE .
The actions of CSC are cancelled in following conditions.
1. Moving of throttle.
2. Pressing ‘BPCS’ while CSC is active, lamp will extinguished.
3. Drop in ‘BP’ by 0.25 kg/cm2 and above.
4. BC pressure more that 0.6 kg/cm2 P/ZRTI-BSL 44 CSC is activated only when
1. Speed is more than 5 KMPH
2. Throttle in either TE or BE side.
3. Train Br. and loco Br. are not applied
4. BPCS is pressed once, lamp will lit.
Some thing Important:
1)To minimize oscillation, the CSC should be set during a slow acceleration phase.
2)CSC will maintain the speed only up to max TE / BE. Speed may vary if required TE / BE is more than loco capacity. So, in an undulating area the speed may vary +/- 10 kmph to preset value. So in such areas BPCS should be pressed at the speed with margin of 10 KMPH.Also in some areas where special driving technique is required, CSC may stall the train. So, in such areas, instead of using CSC, L.P. should use his best driving technique by operation of throttle.
3)Also if CSC is used in very frequent up / down grade region, the loco will trigger for TE to BE and BE to TE very frequently with heavy amplitude, which is not good as far as driving technique is conserved.
4)While canceling CSC ensure that needle position of TE/BE meter and throttle are not just opposite. If so, first bring the throttle as per needle
