Xantrex Technology 120 VAC/60 Generator Control Sequence, 3-TO-2 WIRE CONVERTERS, Operation, Page

OPERATION

Most diesel generators are controlled like the Onan type, except that they also require that glow plugs be operated before the generator start is attempted. The SW Series Inverter/Charger automatic generator control system can also provide glow plug control. The addition of an external relay may be required to operate the glow plugs due to the amperage required by the glow-plugs and to separate the stop signal circuit. For this type of generator, select GLOWSTOP from the SET RY7 FUNCTION menu item under the GEN STARTING DETAILS (13) menu heading.

3-TO-2 WIRE CONVERTERS

Another option for three-wire start-type generators is a 3-to-2-wire converter which vary from simple relays to advanced microprocessor types. Onan offers a simple 3-to-2-wire converter that works well for many installations. Universal 3-to-2 wire converters can be used with virtually any generator as well as control glow plugs for diesel generators. These also feature additional system components to signal the generator control system to start.

GENERATOR CONTROL SEQUENCE

The relays close in a specific sequence to start the generator. Some of the timing periods are adjustable through the GEN STARTING DETAILS (13) menu heading. GLOWSTOP has been added to the sequence for diesel generator applications. RY7 can be configured for either “RUN” or “GLOWSTOP” operation. The two control relays complete the following sequence:

The ’auto generator control sequence’ is initiated if the battery voltage remains below the ’Set start volts DC’ setting (unless

’Start/End Quiet time h:m’ is enabled) for the required period of time or the ’Read LBCO 30 sec start VDC’ setting for 30 seconds;

or if the load amps reaches the ’Load Start amp AC’ setting longer than the ’Set Load Start delay min’ period. The manual

generator control sequence is initiated if generator is manually turned on via ’Set Generator’ to ON.

RY7

First ’auto generator start attempt’

The auto generator stop sequence

is initiated if: (1) The battery

voltage has been held at the ’Set Bulk volts DC’ setting for the ’Set Absorption time h:m’ period or (2)

The load amps drops below the ’Load Start amps AC’ setting for longer than the ’Set Load Stop delay min’ period.

The generator will stop

immediately with an inverter fault or if ’Set Generator’ is set to OFF. Also a "Kill Before Cranking" signal is enabled before the next 'auto generator start attempt'

Next ’auto generator Start sequence has been initiated

Second

‘auto

generator

start attempt’

RUN (or)	OFF			ON (engages to the N.O. position)				OFF
GLOW-				OFF (engages to the N.C. position)
	OFF	ON						ON	OFF
STOP
	START	SET PRE	SET MAX	SET GEN	LOCK ON	GEN-RUN PERIOD	COOL	Generator is	START
	DELAY	CRANK	CRANKING	WARM-UP	GOOD		DOWN	off and	DELAY
	PERIOD	SECONDS	SECONDS	SECONDS	DELAY	(Determined by the	PERIOD	waiting for	PERIOD
					PERIOD	voltage and time		next ’auto
	8 SECS	10 SECS.	10 SECS	60 SECS		settings under the	40 SECS	generator	8 SECS
	FIXED	DEFAULT	DEFAULT	DEFAULT	12 SECS	’BATTERY	FIXED	start	FIXED
					FIXED	CHARGING’ heading		sequence
			(RY8 goes	(Starts once		or by the current and	(Only used
			off with a	voltage	(Starts when	delay min settings	with ’Set
			1 sec delay	exceeds	AC is within	under the ’GEN	Generator’ to
			when	80 VAC)	108 to 132	AUTO START	AUTO)
			AC HOT IN		VAC	SETUP’ heading)
			>80 VAC)		and
					53-67 Hz)

ON

ON

SET PRE

CRANK

SECONDS

10SECS.

DEFAULT

RY8

ON

OFF (engages to the N.C. position)

Time (Sec) 0	8	18		28	88 100	+100 +140 0	8	18
					GEN CONTROL RELAYS
			OFF = relay contact closed from N.C. to COM (relay disengaged)
			ON	= relay contact closed from N.O. to COM (relay engaged)

Figure 26, Relay RY7 and RY8 Sequence

Page

78

 2001 Xantrex Technology, Inc.	Telephone: 360/435-8826	SW Series Inverter/Charger
5916 - 195th Street N. E.	Fax: 360/435-2229	Part No. 2031-5
Arlington, WA 98223	www.traceengineering.com	Rev. C: February 2001