18.104.22.168 Voltages Present at Control Cabinet Assembly Receptacles.
If the AC CIRCUIT INTERRUPTER ON illuminated pushbutton switch (S8) is pressed and the interlock chain is
closed, +24 V is applied to the coil of K14. The interlock chain consists of:
K13, N-O contact 15-18 closed, interlock chain operating;
S7, N-C contact 1-2 closed, AC CIRCUIT INTERRUPTER OFF pushbutton switch;
S8, N-O contact 3-4 closed, AC CIRCUIT INTERRUPTER ON illuminated pushbutton switch;
K16, N-C contact 21-22 closed, power systems of Generator Set 150 kW and Commercial Power Converter
K17, N-O contact 15-18 closed, Generator Set 150 kW power systems are synchronized;
S12, N-O contact 13-14 closed, interlock switch in receptacle L1 (OA);
S13, N-O contact 13-14 closed, interlock switch in receptacle L2(OB);
S14, N-O contact 13-14 closed, interlock switch in receptacle L3 (OC);
S15, N-O contact 13-14 closed, interlock switch in receptacle N;
K27, N-C contact 21-22 closed, no reverse power from second Generator Set 150 kW;
K21, N-C contact 31-32 closed, no overload at one, at two, or at receptacles L1 (OA), L2 (OB), L3 (OC);
K12, N-C contact 81-82 closed, not activated at ECS EMERGENCY;
K25, N-C contact 15-16 closed, Commercial Power Converter in operation.
Auxiliary contactor K14 energizes and latches through N-O contact 1-2:
+24 V is applied through N-O contact 3-4 to the coil of K1. Main contactor K1 energizes and switches generator
voltages to control cabinet assembly receptacles L1 (OA), L2 (OB), L3 (OC) and N.
(See paragraph 22.214.171.124 for maximum current monitoring of receptacles L1 (OA), L2 (OB) and L3 (OC)).
AC CIRCUIT INTERRUPTER ON lamp (H14) is connected to +Vreg through N-O contact 5-6 and lights up.
The control signal (0 V) is applied to PARALLEL OPERATION receptacle J9 through N-O contact 43-44, and
is transfered through the EPP III to the second Generator Set 150 kW.
Generator voltages are applied through F10 to the VOLTAGE SELECTOR SWITCH (S11), with which the phase
and line voltages can be switched for display on the VOLTAGE meter (P6). These voltages are applied, through F10
(phases U, V, W) and the N-O contacts 2-1 and 4-3 of K1 (phase U, OA and phase V, OB), to power measuring
transducer P4a. This measures the active power output, based on the line currents detected by T8 to T10, which is
displayed on the KILOWATTS meter (P4).
The phase U phase voltage is applied, through the N-O contact 2-1 of K1 and F11, to the J1/120 V 400 Hz double
receptacle. Generator voltages arrive at the EPP III Power Distribution Unit through power cables L1, L2, L3, and N.
1 - 2 2