ME 6115-545-34/8-13 Cl
Undervoltage Relay Test Set-Up
(c) In one step, reduce voltage to 99 volts.
(a) Connect 120 VAC, 400 hertz supply
DSl and DS2 shall transfer states within 4 to 8
(d) Increase voltage slowly to l13 volts.
Lamps DSl and DS2 shall transfer states.
(e) In one step, lower voltage to 48 volts.
Transfer of states of DSl and DS2 shall be instant-
(f) Reduce frequency to 50 Hz and repeat
the procedures in paragraphs (a) through (f) with the
(5) TO test the DC relay assembly (A5),
connect the dc relay assembly in a test circuit as
illustrated in figure 8-13A and proceed as follows:
across terminals 18 and 22 of dc relay assembly and
close Sl switch. Measure resistance between ter-
minals 7 and 8 and 19 and 20. Measured resistance
should be 2500 ohms for both measurements. If this
reading is not obtained check for defective resistors
R3, R7, R8, defective rectifier CR4 or defective
(b) Remove power from assembly and
measure resistance between terminals 19 and 20,
and 7 and 8 of dc relay assembly. Resistance
should be 7500 ohms for both measurements. If this
reading is not obtained check for defective relay K7.
(c) Check continuity. between terminals 11
and 10 and 21 and 23. (Ohmmeter + lead placed on
terminals 11 and 21). There should be continuity.
If there is no continuity check for defective diode
CR3 or CR6.
Change 1 8-18A