Timing sequences -13, Rbs pre start sequence -13, Rbs startup sequence -13 – JLG M4069 Service Manual User Manual

Page 45: Rbs shutdown sequence -13, Timing sequences

Advertising
background image

SECTION 3 - CHASSIS & SCISSOR ARMS

3121639

– JLG Lift –

3-13

Timing Sequences

NOTE: Throughout the Generator section, the abbreviations

RBS and CTS are used. RBS stands for Rotary Bat-
tery System, which is the generator system. CTS
stands for Call To Start, which is the electronic inputs
which signal the generator to start and charge the
batteries.

• RBS Pre start Sequence

1. Time Delay Engine Start (TDES)

TDES is the period which the RBS waits to verify 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 temperature setting. The engine 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 does not successfully start, the RBS will
wait for the rest time before attempting to crank the
engine again.

3. Crank Cycles

The RBS will attempt to start the engine up until the
number of crank cycles is reached. If the RBS does
not start, an Overcrank fault is indicated.

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
shutdowns are monitored.

• RBS Shutdown Sequence

Once all CTS conditions have been removed, the RBS will
begin the shutdown sequence. If a CTS condition is initi-
ated during the shutdown sequence, the RBS will return to
normal running operation until the CTS is removed.

1. Time Delay Engine Run (TDER)

Once the CTS condition is removed, the TDER
period begins. This period ensures that no further
CTS conditions occur prior to the cool down period.

2. Time Delay Cool down (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 3-4. RBS Pre start Sequence

CTS (Call to Start)

TDES (Engine Start)

Preheat Delay

RBS Startup Sequence

Table 3-5. RBS Startup Sequence

Crank Time -> Rest Time

(Until Engine Start or # of Crank Cycles)

TDBP Bypass

Normal Running Operation

Table 3-6. RBS Shutdown Sequence

Remove CTS

TDER Engine Run

TDC Cool down

Engine Stop

Advertising
This manual is related to the following products: