Service manual

T r o u b l e s h o o T i n g T r e e s • C o m b i t h e r m C t e x p r e s s t e C h n i C a l s e r v i C e m a n u a l • D – 33
troubleshooting trees
K-77 Safety Contactor Troubleshooting (380-415V only)
L1/A1 supplied from TB 16, TB 16
supplied from RBH X4/414, L2/A2
supplied from N7 high limit
Is L1/L2/L3 power across
terminals 2/4/6 on K-77
contactor?
Yes
No
Is K-77 contactor coil
energized?
No
Yes
Repair wiring
Replace K-77 contactor
Is L1/L2/L3 power across
terminals 1/3/5 on K-77
contactor?
No
K-77 is operating correctly
Yes