
MEP 660 - Trouble shooting Manual
Doc No.: IM – 51
Rev.2.0
Print: October 2008
160
PARAMETER
DESCRIPTION
FAULT CODE
1150
FAULT MESSAGE VCD Circuit Open. Run Auto/Manual Test.
Alerter Brake might be applied. Loco may not move.
RESTRICTIONS
--
ALARM BELL
5 sec.
RESET LEVEL
LOW, Manual
If the fault condition is still present even when cleared manually, the
fault will be generated again.
FAULT
RECOVERY
Automatic when VCDR auxiliary contact is closed.
PROBABLE
CAUSES
1. Defective relay VCDR.
2. Defective wiring.
3. Defective digital output card MLSD16 card
4. Defective Digital Input card MDIP 16.
FAULT
ISOLATION
1. Crank the engine. Check the status of the relay VCDR.
2. If the relay is in de-energised position, check the voltage across the
operating coil of the VCDR.
A. If the voltage is more than 65V and relay not picking up, then
the relay is defective. Replace the relay.
3. If the voltage is zero, check the voltage between wire-13 at the
VCDR coil terminal and locomotive 4 wire.
A. If the voltage is zero, check the continuity of wire 13 connected
to VCDR coil terminal. Identify the wrong wiring and replace.
4. If the voltage at wire 13 (VCDR coil terminal) is more than 65V,
check the voltage between locomotive wire-13 and ALRR wire at the
coil terminal.
A. If the voltage is 0, there is no continuity of wire ALRR from
MEP660 to VCDR coil.
a) Check the slackness of the connector cable (ID: AZ) at the
MEP-660 control unit. If slack tighten the connector.
b) Check the continuity of the wire ALRR from the coil to
connector of cable ID: AZ, Pin No. K. If necessary replace
the cable.
c) If still relay is not energized, the MLSD 16/2 card in slot No.
15 defective. Replace the card and check up.
5. If the relay is in energized position, check the status of Green LED
11 on the digital input card MDIP 16 in slot no.12.
6. If Greed LED 11 is not glowing, check the voltage between wire 51
at the VCDR interlock and locomotive 4 wire.
A. If the voltage is 0, check the continuity of 51-wire loop. Identify
and replace the wrong wiring.
7. If the voltage is more than 65V, check the voltage between wire
ALT at the VCDR interlock and locomotive 4 wire.
A. If the voltage is zero, then the relay interlock is bad. Replace
the relay.
8. If the voltage is more than 65V,
A. Check the slackness of the cable (ID: AW) connector at the
MEP-660 control unit.
B. Check continuity of the wire ALT from ALRTRB relay interlock to
the connector Pin – M (ID: AW).
C. If necessary replace the cable and check.