METRON FD2 User Manual

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2. Check wire from control panel to oil pressure switch on engine and also from switch to
ground on two-wire switches.
G. HIGH ENGINE TEMPERATURE ALARM DOES NOT OPERATE
1. Selector switch must be in "Auto" and the engine running for this test. Simulate high
water temperature by shorting terminals of temperature switch. If "High Engine
Temperature" light and/or alarm does not come on and status light #5 does not come on,
the problem is in the engine or engine to Controller wiring.
2. Check wire from panel to water temperature switch and also from switch to ground on
two-wire switches.
3. If operation is correct on this test but not under actual high engine temperature conditions,
replace water switch.
H. OVERSPEED ALARM AND SHUTDOWN DOES NOT OPERATE
1. Simulate Overspeed by momentarily shorting terminals of the speed switch. If status light
#3 is on but engine does not shutdown and alarm does not operate, problem is in Controller.
If status light #3 does not come on, problem is in engine or engine to Controller wiring.
2. Check wire from panel to Overspeed switch.
3. If engine stops, and the light and alarm operate on this test, but not under actual conditions
by overspeeding engine, replace overspeed switch.
4. If Controller is at fault, check relay 15CR, diode D46, D47, or D49 on the main logic board.
I. CIRCUIT BREAKER IN CONTROLLER TRIPPED
1. Check to see if Voltage Regulator is sticking.
2. Check to see if engine generator or alternator is charging above the capacity of the breaker -
20 amperes. Note: On newer engines the charging circuit does not go through the
controller.
3. Check for external short circuits to ground in all wires from panel.
4. Check conditions of status lights. See - TEST PROCEDURE.
J. LOSS OF BATTERY CHARGER OUTPUT
1. Check A.C. voltage to charger.
2. Check charger fuses.
3. Check connections to charger.
4. See separate NRG charger manual for troubleshooting procedures.
PART VI: SEQUENCE OF OPERATION
A. Introduction
Refer to schematic wiring diagram. All relay contacts are shown in the de-energized position.
Control relays are designated as CR. Diodes designated D are located on the main logic board;
diodes designated PD are stud mounted on the relay panel; and Time delay relays are designated TR.
Squares with numbers designate field wiring terminals and diamonds with letters designate terminals
for connections within the Controller. The main logic board designated LB contains circuits for the
Crank Control (CC), Voltage Sensing Circuit (VS), Alternating Relay (AR), Oil Pressure Solid State
Timer (K1), Field terminal LEDs and all the diodes except the power diodes 1PD and 2PD.
Connections to the main logic board a designated with hexagons.
B. Controller Battery Power
Power to operate Controller comes from the two engine batteries. Battery No.1 is connected to Field
Wiring Terminal Bar (1T) Terminal 6 and is fed through Circuit Breaker 1CB to Diode 1PD, the LB
pin 36), the Manual Crank Pushbutton (1PB), and the Battery Switching Relay (5CR terminal 1).
Battery No.2 is connected to 1T Terminal 8 and is fed through 2CB to 2PD, LB pin 37, the Manual
Crank 2 Pushbutton (2PB) and 5CR terminal 4. Diodes 1PD and 2PD allow the Controller to receive
battery power from the battery with the higher potential.
Relays 10CR and 11CR are battery failure relays, and are energized through the solid state Voltage
Sensing (VS) Circuit portion of the main logic board. If both batteries are fully charged, 10CR and
11CR are held energized through the VS and both battery lamps 1B and 2B will be lighted. The

METRON FD2 Specifications

General

Brand	METRON
Model	FD2
Category	Controller
Language	English