Guardian 4721, Руководство по ремонту

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DC CONTROL
LIQUID COOLED
ENGINE UNITS
SECTION 4.1
DESCRIPTION AND COMPONENTS
PART 4
Page 59
• The board delivers “field boost” current to the gen-
erator rotor via Connector Pin 1 and Wire 4. Also
see Section 2.2, “Field Boost”.
• The circuit board provides automatic engine shut-
down in the event of (a) low engine Oil pressure, (b)
high engine coolant temperature, (c) low coolant
level, (d) overspeed and (e) overcrank. See Section
1.6, “Engine-Generator Protective Devices”. On
occurrence of any one or more of these engine faults,
the circuit board will turn on a fault indicator lamp.
The various functions handled by the control board
are listed in the following chart, along with appropri-
ate circuit board connector pin numbers and wire
numbers.
PIN WIRE FUNCTION (Wiring Dia. #0F5243)
2 4 Field boost to rotor (9-10 volts DC)
3 85 Engine shutdown fault line (low oil pressure,
high coolant temperature)
4 23 Grounded (-) side of transfer relay circuit
5 194 Positive (+) DC side of transfer relay circuit
6 56 +12 volts DC to control contactor for cranking
7 --- Not used
8 14 +12 volts DC to ignition coil and hourmeter
9 --- Not used
10 178 Manual start line to AUTO-OFF-MANUAL switch
11 15A +12 volts DC with AUTO-OFF-MANUAL switch
at AUTO or MANUAL
12 239 +12 volts DC to AUTO-OFF-MANUAL switch
13 15 +12 volts DC (battery trickle charge)
14 0 Common ground
15 224 14 volts AC from control board sensing transformer
16 225 14 volts AC from control board sensing transformer
17 T2 Line-to-line AC voltage from “Load” terminal
lugs of transfer switch
18 T1 Line-to-line AC voltage from “Load” terminal lugs
of transfer switch
2 S15 Frequency (rpm) sensing from AC power winding
3 S16 Frequency (rpm) sensing from AC power winding
4 150 Engine preheat (only on diesel engine units)
5 229 Negative (-) side of optional alarm relay connec
tion. Circuit board action will complete this circuit
to ground on occurrence of a fault shutdown.
6 176 Negative (-) side of fault indicator lamp circuit.
Circuit board action will complete this circuit to
ground on occurrence of a fault shutdown.
Figure 3. Control Board Connector Terminals
CONTROL CONSOLE COMPONENTS
TERMINAL BOARD TB1:
This 20-position terminal board (Figure 4) provides a
convenient connection point for DC control system
wiring. Terminals, associated wires and their func-
tions are listed in the following chart.
TERM. WIRE FUNCTION
0 0 Common ground
79 -- Not used on prepackaged units
13 13 Unfused battery volts (12 volts DC)
14 14 12 volts DC with engine running only- used to
turn on ignition, open a fuel solenoid and turn
on an hourmeter.
15 -- No factory connected wires (fused 12 volts
DC)- see Terminal 229.
4 4 Regulated excitation and field boost current
to rotor
229 --- Connection for remote alarm
56 56 12 volts DC when cranking only
68 68 Oil pressure sender to panel gauge
69 69 coolant temperature sender to panel gauge
85 85 Low oil pressure switch connection
86 86 High coolant temperature switch connection
150 --- For preheat on diesel engine units only
218 --- Not used on prepackaged units
219 --- Not used on prepackaged units
NOTE: For additional information on Terminal 229
see “Remote Alarm Connection” in this section.
Figure 4. Terminal Board TB1
REMOTE ALARM CONNECTION:
Terminal 229 on terminal board TB1 is a connection
point for an alarm system (not supplied). The terminal
will support any relay requiring up to a maximum of
100 milli-amps of current draw. A relay coil is con-
nected across terminals 15 and 229. A remote alarm
device is connected across the relay contacts so that,
on contacts closure, a separate power supply will turn
the alarm device on. Terminal 15 is fused battery volt-
age (12 volts DC). On occurrence of any monitored
engine fault, control board action will complete the
terminal 229 circuit to ground, to energize the relay
and turn the alarm on.
0 0 0 79 13 14 14 15A 15A 15 4 229 56 68 69 85 86 150 218 219
2
4
8 5
2 3
194
56
14
17 8
150
S 16
S 15
229
176
15A
2 3 9
15
0
224
225
T2
T1
3 4 5 6 7 8 9 10 11 12 1 3 14 15 16 17 1 8
2
3
4
5
6