Marine Electrical Products
SI-ACR
Automatic Charging Relay
with Start Isolation
PN 7610
Features
•Automatically combines batteries during charging, isolates batteries when discharging and when starting engines
•Allows temporary isolation of house loads from engine circuit during engine cranking to protect sensitive electronics—start isolation indicated by blinking LED
•Supports high-output alternators up to 120 Amps
•Ignition protected—safe for installation aboard gasoline powered boats
•LED light is ON when batteries are combined
•Under voltage lockout—will not close when the lower battery is below 9.5V @ 12V System or 19V @ 24V System—lockout indicated by blinking LED
•Waterproof rated IP67----temporary immersion for 30 minutes
•For 12 or 24 volt systems
•Dual Sensing—senses charge source on either battery bank
LED Status Chart
LED |
BATTERY STATUS |
REASON |
On |
Combined |
Charging |
Off |
Isolated |
Discharging |
Slow Flash |
Isolated |
Start Isolation wire |
|
Start isolation |
is energised |
Fast Flash |
Isolated |
One or both batteries are below |
|
Under voltage lockout |
9.5V (12V System) 19V (24V System) |
Specifications |
|
12V DC |
24V DC |
Continuous Rating |
|
120A |
120A |
Intermittent Rating (5 min.) |
210A |
210A |
|
Maximum Cable Size |
1/0 AWG |
1/0 AWG |
|
Terminal Stud Size |
|
3/8"-16 (M10) |
3/8"-16 (M10) |
Maximum Torque |
|
140 in-lbs |
140 in-lbs |
Relay Contact Position |
|
|
|
Combine |
(30 sec.) |
13.6V DC |
27.2V DC |
|
(2 min.) |
13.0 V DC |
26.0V DC |
Open Low |
(10 sec.) |
12.35V DC |
24.7V DC |
|
(30 sec.) |
12.75V DC |
25.5V DC |
Over Voltage Lockout |
16.0V DC |
32.0V DC |
|
Under Voltage Lockout |
9.5V DC |
19V DC |
|
Regulatory E marked for Ignition Protection, Meets ISO 8846, UL 1500 and SAE J1171 external ignition protection requirements
Rated IP67----temporary immersion for 30 minutes
Guarantee
Blue Sea Systems stands behind its products for as long as you own them. Find detailed information at www.bluesea.com/about.
For customer service, call 800-222-7617.
Installation Instructions
Mounting
•To avoid corrosion to connecting wires and terminals, mount in a dry and protected location if possible. Avoid locations directly above the battery banks.
Electrical Connections
•The wiring diagrams illustrated on the back page represent common installations and are not meant to be a guide for wiring a specific vessel.
•The 7610 ACR is not intended to carry starting currents. Use a battery switching system with a combine batteries/parallel function if batteries may need to be combined for emergency starting. Caution: Disconnect battery connections before beginning the installation.
Use the wire sizing chart below to select the appropriate wire sizes to prevent overheating the ACR.
Wire Size and Fuse Rating Chart (AWG)
Charging Amps |
Minimum Wire Size* |
Fuse Rating |
≤60 |
#6 |
75-90A |
≤80 |
#4 |
100-125A |
≤100 |
#2 |
150A |
≤120 |
#1 |
175A |
*Larger wire sizes may be required to minimize voltage drop in long wire runs.
For more information please use the Circuit Wizard at www.circuitwizard.bluesea.com.
Voltage Sensing
•The 7610 ACR will sense charging sources available on either battery bank.
Minimum connections for operation:
•Connect one battery bank to stud terminal A.
•Connect the other battery bank to stud terminal B.
•Connect the quick connect terminal marked GND (ground) to the DC system ground through a ten to fifteen amp in-line fuse to prevent fault currents from flowing in this wire.
Optional connections:
1. Start Isolation (SI) Wire
•The 7610 ACR can be configured to automatically disconnect when the starting circuit is engaged. Enable this feature to isolate the start circuit from the house circuits and prevent starting currents from flowing through the ACR or starting current transients from interfering with loads on other batteries. The reaction time of the 7610 ACR is fast enough to disconnect the battery banks before the
starting current rises in the starting circuit.
To enable start isolation:
•Connect a wire from the quick connect terminal marked SI (starting isolation) to the terminal or wire running from the start key switch to the starter solenoid. Make this connection through an in-line fuse of 1 to 10 Amps. This connection can be made at the start key switch or at the starter solenoid, but must be to the line that is positive only when cranking. Connection to a line that is positive while the engine is normally running will prevent the charging relay from working properly.
2.Remote indicator lamp – mirrors “COMBINED” LED on unit.
• Appropriate 12/24V LEDs include Blue Sea Systems PNs 8033 (amber), 8171 (red), or 8172 (green).
To connect a remote LED indicator:
•Connect the red wire of the LED to a 12/24V positive source through a 2A inline fuse.
•Connect the yellow wire of the LED to the quick connect terminal marked LED.
Open/Close Cycling
•If your electrical system is configured with a charging source that cannot supply the full load current being drawn from the receiving batteries, an open/close cycling process can occur. If this cycling continues, the second battery bank could eventually discharge even though a charge source
is present.
990170140 Rev.009
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