User Manual

SECTION 2 - PROCEDURES
2-72 – JLG Lift – 3120884
Timing Sequences
• RBS Prestart Sequence
1. Time Delay Engin e Start (TDES )
TDES is the period which the RBS waits t o v erify that
the CTS is valid rather than a transient condition.
2. Time Delay Pre-Heat (TDPH)
TDPH, if enabled, occurs after TDES has elapsed
and the engine temperature is below the factory set
engine preheat temperatu re setting. The engi ne pre -
heater will be energized for the factory set preheat
delay period.
• RBS Startup Sequence
1. Crank Time
The RBS will crank for a period up to the crank time
or until the engine starts.
2. Rest Time
If the engine do es not successfully star t, the RBS will
wait for the rest time before attempting to crank the
engine again.
3. Crank Cy cl e s
The RBS will attempt to start the engine up until the
number of crank cycles is reached. If the RBS does
not start, an Overcran k fault is ind ic ated .
4. Time Delay Bypass (TDBP)
Once the engine starts, TDBP must elapse before
low oil pressure and underspeed shutdowns are
activated. This allows the engine to come up to nor-
mal operating conditions before enabling these
shutdo wns are monitored.
• RBS Shutdown Sequence
Once all CTS conditions have been removed, the RBS will
begin the s hutdown sequ ence. If a CT S conditi on is initi-
ated during the shu tdown sequence, the RBS will return to
normal runnin g operation until the CTS is removed.
1. Ti me Delay Engin e Run (TDER)
Once the CTS condition is removed, the TDER
period begins. This period ensures that no further
CTS conditions occur prior to the cooldown period.
2. Time Delay Cooldown (TDC)
Once the TDER period ends, the alternator output is
reduced to a minimal level in order to allow the
engine to cool down for the TDC period. If a CTS is
received during the TDC period, the CTS must last
for at least the TDES period for the RBS to return to
normal running operation.
Table 2-12. RBS Prestart Sequence
CTS (Call to Start)
TDES (Engine Start)
Preheat Delay
RBS Startup Sequence
Table 2-13. RBS Startup Sequence
Crank Time -> Rest Time
(Until Engine Start or # of
Crank Cycles)
TDBP Bypass
Normal Running Operation
Table 2-14. RBS Shutdown Sequence
Remove CTS
TDER Engine Run
TDC Cooldown
Engine Stop