151Section 8 Component Testing and AdjustmentTP-6356 4/12
g. Position the grommet (Figure 8-50, Item 5) to
align with the notch in the LED circuit board
cover (FRt II) or rotating rectifier assembly
cover (FRt III).
h. Use cable ties as needed to secure the wiring
harness.
i. Install the LED circuit board cover (FRt II) or
rotating rectifier assembly cover (FRt III)
using the original screws.
j. Replace the junction box rear access panel and
screws.
k. Close the doors on the enclosure, if equipped.
4. Restore power to the generator set.
a. Place the generator set master switch to the
OFF/RESET position (Decision-Makerr 1, 3+,
and 550 only).
b. Reconnect the battery, negative lead last.
c. Reconnect the battery charger, if equipped.
5. Test run the generator set.
a. Start the generator set per the Operation
Manual instructions.
b. After determining that the generator set
functions correctly, STOP the generator set.
8.21 Time Delay Relay
(135--275 kW DDC-Pow ered Gas Models)
The 135-275 kW Detroit Diesel Series 50/60 gas models
have a time delay to OFF relay (TDR) and a 3-pole relay
(TDR1) providing battery power to ignition coils (P29)
and throttle/ECM circuit (P30) during engine cranking
and running. Battery power is maintained to P29 and
P30 connectors for 10--15 seconds after the generator
set stop switch activates. This additional time allows the
engine to burn residual fuel from the system after the
fuel valve closes preventing engine backfire. See
Figure 8-54.
8.21.1 Sequence of Operation, Engine
Cranking and Running
D The generator set run (start) circuit is activated by
local or remote starting mode.
D Wire 71 energizes the TDR relay.
D TDR normally open contacts 9-6 close to energize
TDR1 relay and TDR2 relay (wire 70T).
D TDR normally open contacts 7-4 close to enable
function of the anticipatory hot coolant temperature
switch (40A).
D TDR1 relay normally open contacts close. Contacts
7-4 close to energize P29-B (wire 440), contacts 8-5
close to energize P30-B (wire 121), and contacts 9-6
close to energize P30-D (wire 122).
D TDR2 relay normally open contacts 30-87 close to
energize P27-B3 (wire 439) and to bypass toggle
switch SW1-2 on engine light/diagnostic box and
provide power to ECM.
D TDR2 relay normally closed contacts 30-87A open to
toggle switch SW1-1 (wire 400) on engine light/
diagnostic box.
8.21.2 Sequence of Operation, Engine
Shutdown
D Generator set stop circuit is activated by local or
remote stopping mode.
D Power to time delay to OFF relay (TDR) is removed
and TDR times out 10--15 seconds and TDR
deenergizes.
D TDR normally open contact 9-6 open to deenergize
TDR1 relay and TDR2 relay (wire 70T).
D TDR normally open contacts 7-4 open to disable
function of the anticipatory hot coolant temperature
switch (40A).
D TDR1 relay normally open contacts open. Contacts
7-4 open to deenergize P29-B (wire 440), contacts
8-5 open to deenergize P30-B (wire 121), and
contacts 9-6 open to deenergize P30-D (wire 122).
D TDR2 relay normally open contacts 30-87 open to
deenergize P27-B3 (wire 439) and to enable toggle
switch SW1-2 on engine light/diagnostic box and to
disconnect power to ECM. This contact provides
power to the ECM when operating the engine light/
diagnostic box.
D TDR2 relay normally closed contacts 30-87A close to
toggle switch SW1-1 (wire 400) on engine
light/diagnostic box.
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