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DIESEL LOCO – Gauges

January 5, 2021, 11:43 PM

DIESEL LOCO – Gauges

Following gauges are provided in loco

1. Brake Cylinder Pressure Gauge
It is provided on both control stands. Brake cylinder pressure gauge shows 3.0 kg/cm² pressure on loco brake application.

2. Brake Pipe Pressure Gauge
It is located on both control stands. BP pressure gauge shows 5.0 kg/cm² on A9 release condition.

3. MR and FP Pressure Gauge
It is a duplex gauge and provided on both control stand. Left side needle shows MR pressure and right side shows FP pressure. MR pressure gauge shows 8-10 kg/cm² and FP pressure gauge shows 6.0 kg/cm².

3. Vacuum Gauge
It is provided on both control stands in dual brake loco. It shows Train Pipe vacuum level.

4. Vacuum Control Pressure Gauge
It is provided on right control stand. It shows 24 ± 1 psi (1.7kg/cm²) when adjusted by HS-4 valve.

5. Control Air Pressure Gauge
It is provided in Nose compartment or in loco pilot cab, it shows 5.0 kg/cm² when adjusted by NS-1 reducing valve.

6. Fuel Oil Pressure Gauge
It is provided on Nose compartment wall in loco pilot cab, it shows fuel oil pressure in fuel oil system i.e. 4.2 kg/cm².

7. Lube Oil Pressure Gauge
It is provided on Nose compartment wall in loco pilot cab, it shows lube oil pressure in lube oil system i.e. 5.2 kg/cm².

8. Booster Air Pressure Gauge
It is provided on Nose compartment wall in loco pilot cab, it shows ‘V’ gallery air pressure i.e. 1.97 kg/cm².

9. Air Flow Indicator
It is provided on both control stands, connected with air flow measuring valve. It shows rate of air flow between MR2 and brake pipe. It has 0-100 (no. of wagon) marking. It has 2 needles white & red. White shows air flow and red is a reference pointer. When loco coupled with load and BP shows 5.0 kg/cm², that time red needle to be set with white needle. Whenever air flow increase to charge BP, white needle shoot up , do not open the notch till the white needle comes to its original position (on red pointer).

10. Battery Ammeter
It is provided on front panel, it shows charging or discharging rate of battery. It has 0 in center and on either side marking of 200 Amp. On right side it shows charging and on left discharging.

11. Load Meter
It is provided on both control stands, it shows the of current in TM, having each marking of 100 amps.

12. Water Temp. Gauge
It is provided in expresser room engine right side, shows water temperature of cooling water system. It has marking of 0 to 1200

Switches on Loco

1. GFCO – It is provided on both control stands having two positions on & off. When these are in on position and throttle on notches wire no.6 gets energize and GF contactor will pick up.

2. MUSD – It is provided on both control stands having two positions run & stop. It is used to shut down all the loco simultaneously while working multiple units.

3. Head Light Switch – It is a rotating switch and provided on both control stands having six positions Both ‘OFF’ (front & rear),

Bright rear,
Bright front,
Dim rear,
Dim front,
Both dim (front & rear).

4. Gauge Light Switch – It is provided on both control stands having two positions ON &OFF.

5. Marker Light Switch – It is provided on both control stands having two positions ON & OFF.

6. Compartment Light Switch – It is provided on both control stands having two positions ON &OFF.

7. Flasher Light Switch – It is provided on flasher light control unit on both control stands. Each box having two switches

Main switch – having two positions ON & OFF.
Filament switch – having two positions F1 & F2.

8. Battery Knife Switch – It is provided in Nose compartment having two positions CLOSE & OPEN

9. Engine Control Switch (ECS) – It is provided on front panel having two positions IDLE and RUN.

10. Motor Cut Out Switch (MCO) – It is provided on front panel having seven positions and use for isolation of TM.

11. Manual Transition Switch- It is provided on front panel. This switch is used when automatic transition not coming.

Circuit Breaker

Cab Light circuit breaker – It is provided on front panel and protects the cab light circuit.

Engine room light circuit breaker – It is provided on front panel and protects the engine room light circuit.

Dome light circuit breaker – It is provided on front panel and protects the dome light circuit.

Head light circuit breaker – It is provided on front panel and protects the head light circuit.

MB1 – It is provided on front panel, gives battery + ve supply to control circuit and also protects it.

MB2 – It is provided on front panel, gives battery – ve supply to control circuit and also protects it.

MFPB – It is provided on both control stands. FPB – It is provided on front panel and protects the fuel pump motor.

CEB – It is provided on front panel and protects the crank case exhauster motor.

AGFB – It is provided on front panel and protects the auxiliary generator field.

RFCB – It is provided on front panel and protects the radiator fan circuit.

DEB – It is provided on front panel and protects the cyclonic motor.

RBB –It is provided on front panel and protects the rectifier blower motor.

FPB3 – It is provided on front panel/left control stand and protects the fuel pump motor and used to by pass FPC and FPB.

Relay

It is electromagnetic remote control device, is used to make and break the control circuit. Different types of relay are used as per requirement. Control of circuit is control by interlocks. In de-energized condition of relay the interlock which are in opened condition are called normally open interlocks (NOI) and which are in closed condition are called normally close interlocks (NCI).

Diesel locos have following relays

GR1 (Ground Relay) – It is provided on front panel and protects the power circuit from grounding.

GR2 (Ground Relay) –It is provided on front panel and protects the starting circuit from grounding.

SAR (Safety auxiliary Relay) – It is provided on EH type governor loco and protects auxiliary machines.

DMR (Dead Men’s Relay) – It is provided on front panel. Whenever load part/ACP and A9 applied in emergency position, DMR gets deenergize and engine speed comes to idle.

WSR 1, 2, 3 (Wheel Slip Relay) – These are provided on front panel. It operates during wheel slip and protect wheel skidding, TM and rail.

GFOLR (Generator Field over Load Relay) – It is provided on front panel and protects from excess current flow in alternator field.

TDR (Time Delay Relay) –It is provided on front panel, during cranking, if any one of CK1, CK2, CK3 is welded that time this relay will remain energized and protects voltage regulating panel.

BSR (Battery Safety Relay) –It is provided on front panel in WW Governor loco only, it energize when WW governor plunger came out or MUSD on stop position and does not allow the engine to crank hence battery consumption is saved.

CKR 1 & 2 (Cranking Relay) –These are provided on front panel. CKR1 separates exciter shunt field and CKR2 separates auxiliary shunt field during cranking.

ESR 1, 2, 3, 4 (Engine Speed Relay) – These are provided on front panel in EH governor loco and used for increasing and decreasing engine speed. TR (Transition Relay) –It is provided on front panel for parallel transition.

BKR1, 2, 3 (Braking Relay) – These are provided on front panel and it used during dynamic braking. SR (Signaling Relay) – It is provided on front panel and it is used for alarm circuit.

ERR (Engine Run Relay) – It is provided on front panel in WW governor loco only. At the time of power ground, Generator field over load, ECS (Run) ERR de-energize and engine comes to idle.

VAPR (Vent Air Pressure Relay) – It is provided on front panel in alternator loco and protects the rectifier block from insufficient air supply.

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