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 TM5-4120-383-14
4-29.
RELAYS.-Continued
(b) Apply +28VDC to terminal 1 of K1 and 28VDC ground to
terminal X2 of K3. Terminal 1 of K1 is positive and terminal X2 of
K3 is negative.
(c) Multimeter must show continuity across terminals A1 and
A2 of relay K3 within 30 3 seconds after applying the 28 VDC.
The multimeter must show that
(d) Remove the 28VDC.
contacts are open.
(8) Phase sequence relay K5.
(a) This relay will energize only when all three phases of
input power are in proper sequence and when input voltage and
frequency are within 10% of that specified (208 volt, 60 hertz).
(b) Check that power connections are properly connected and
that input power is within 10% of that specified.
Removal.
b.
(1) Tag and disconnect wires to relay.
(2) See figure 4-25 and remove attaching hardware.
(3) Pull relay from junction box.
Replace individual relays if defective.
Replace.
c.
d.
Installation.
(1) Mount relay using hardware indicated on figure 4-25.
(2) See figure 4-4 wiring diagram and tags and connect leads.
If relay has solder connections be sure to protect solder joints
with heat shrink or equal insulation tubing.
(3) Carefully slide junction box into place and secure with
seven screws and lock washers.
(4) See paragraph 4-21c and install control module.
(5) Install top front cover (para 4-11).
(6) Connect power at power source.
4-81
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