Service Manual
R8010RB
MVAX Page 15/24
5. PROBLEM ANALYSIS
5.1 Failure to operate/reset
Check diagram for correct input connections. Check the correct voltages are applied.
Ratings values are shown on module front plate.
Ensure the power supply is capable of supplying the necessary power.
Ensure correct series resistors are used and connected to correct relay terminals.
Flag spring may have been distorted and is holding the armature open or closed.
Check internal wiring.
Check continuity – result open circuit.
Coil open circuit.
Internal wiring damaged.
Series resistor open circuit (resistors may be internal or external).
5.2 Output contacts not changing state.
Pushrod not in position. Check output terminals with reference to diagram. Contamination of
contacts.
MVAX 21, 31, 91. Units RL
2
, RL
3
contacts not closing.
5.3 Reset time on MVAX 12 too short.
Check capacitor C
1
is not open circuit or short circuit.
Contacts should be cleaned with the burnishing tool supplied in relay tool kits.
On no account should knives, files or abrasive materials be used.
Check mechanical settings as per Section 4.
6.
6.1
SPARES
When ordering spares, quote the full relay model number and any component references
numbers, or briefly describe the parts required.
Repairs
Should the need arise for the equipment to be returned to General Electric for repair, then
the form at the back of this manual should be completed and sent with the equipment
together with a copy of any commissioning test results.
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