Figure 5-7. Contactor, removal and installation.

TM 5-6625-2691-13&P

Figure 5-7. Contactor, removal and installation.

iliary contact (K1-4) will open as soon as the power

5-12. Contactor

poles all close. If this contact does not open, the

a. Model A427 Contactor. This contactor, a

coil will draw excessive current, and could burn-

three pole, normally open with 24 VDC coil. It is

out. Also, if the auxiliary contact K1-4 opens

capable of switching and carrying the rated load of

before the power contacts close (or if K1-4 is al-

the test set. The nominal resistance of the coil is

ways open), the power contactor will not close. In

12 OHMS.

this situation, since the fans are not running, the

b. Model A427B Contactor. This contactor has

unit will shut down, and lock-out after about (5)

three normally open power poles and one each

seconds.

normally open and normally closed auxiliary con-

c. Removal. Refer to figure 5-7 and remove the

trol contacts. The contactor coil is nominal 24

contactor.

VDC with approximately 2 OHMS resistance. The

d. Installation. Refer to figure 5-7 and install

relay is designed so that the normally closed aux-

the contactor.

5-8 Change 1