Figure 6-29. Undervoltage relay (K11), test setup
6-113. INSTALLATION. Refer to figure
6-22 and install the undervoltage relay in
the mode II relay box. Secure the relay in
Remove cover from mode II
position with four screw assemblies, then
relay box to gain access to the
Replace mode II relay box cover.
6-114. PE RMISSIVE PARALLELING
1. Remove wire from terminal 7 of
RELAY (K16), 400 HERTZ.
the K16 relay to prevent the contacts from
6-115. ON EQUIPMENT TEST.
at rated speed and voltage and the-load buss
energized by a second set, measure the
a. Symptom and Isolation of Malfunc-
voltage from terminal 3 to terminal 4 of
tion. A malfunction of the permissive
the K16 relay. The voltage should read
paralleling relay K16 is usually indicated
by the load contactor CB2 closing when the
set voltage is out of phase with the buss
voltage. To isolate the malfunction, pro-
2. Measure the voltage from terminal
ceed as follows:
1 to terminal 2 of K16 with the contactor
switch (S3) in the close position. Connect
Exercise extreme care not
to touch exposed electrical
terminals 1 and 2 is above 10 VAC; if the
connections when working
contacts close with a higher voltage the K16
inside mode II relay box with
relay is defective.
generating set operating.