Blue Sea Systems 7620 ML-ACR Automatic Charging Relay - 12V DC 500A - Manual (Page 2)

Installation Instructions
Mounting
Install the ML-Series ACR as close as possible to both battery banks so that positive and negative wires are
as short as possible, and voltage drop in these wires is kept to a minimum ‡ . To avoid corrosion to terminals
and connecting wires, mount in a dry and protected location. Avoid mounting directly above vented lead acid
batteries so that the ACR is not exposed to corrosive gasses expelled from the batteries.
‡ Because the ACR senses the voltage between its negative ground connection and its positive sense
connections, both positive and negative wires should be as short as possible so that the influence of
voltage drop on sensed voltage levels is minimized.
High Current Primary Circuit Connections (stud terminals A and B)
For help selecting the appropriate wire size and circuit protection rating, go to www.bluesea.com and click the
Circuit Wizard quick link.
To connect high current circuit wires:
1. Connect the battery banks to the stud terminals marked A and B.
2. Torque the high current terminal stud nuts to 140 in-lbs (15.5 N•m) maximum.
NOTES: Stud terminals A and B are interchangeable. Either battery bank can be connected to A or B.
If the ACR is to be used for cross connect, fuses between ACR terminals A and B and each battery
positive are not required according to ABYC guidelines. If the ACR is not used for cross connect,
install fuses to prevent a hazard if there is damage to the wires connecting the batteries to the ACR.
The fuses should be placed as close as possible to the batteries so that most of the wire is protected.
Control Circuit Connection (wire contained in the wire harness)
Ground Connection
Connect the black wire in the wire harness to DC ground at the main ground terminal busbar.
Optional Control Circuit Connections (wires contained in the wire harness)
Cross Connect or Isolate Battery Banks
Use the included Control Switch—sustained (SPDT) ON-OFF-ON.
Alternatively use a momentary (SPDT) (ON)-OFF-(ON) or momentary push button switch (sold separately) to
provide cross connect and/or battery isolation. The Control Switch should be mounted in a convenient location
near helm controls to allow for quick access.
NOTE: Use 16 AWG
wire for all Control Circuit connections to meet ABYC minimum wire size requirement.
Cross Connect or Isolate Battery Banks Using Optional Control Switch
Use Control Switch – momentary or sustained single pole double throw (SPDT) to provide these settings:
• CROSS CONNECT ( I ) - Battery banks are combined to provide more battery power in hard
starting situations.
• ISOLATE (O) - Battery banks are isolated until the Control Switch is returned to AUTO (center position).
When the Control Switch is returned to AUTO, the ACR returns to automatic mode.
To enable cross connect and isolation, connect:
• Red wire from harness to center (common) of SPDT switch.
• Cross Connect terminal of SPDT switch to DC positive through 2A circuit protection.
• Isolate terminal of SPDT switch to DC negative (ground).
To enable temporary cross connect using momentary push-button switch:
• Connect the red wire from the harness to one side of a momentary push-button switch (sold separately).
• Connect the other side of the push button switch to DC positive through 2A circuit protection.
page 2 of 4
Overview of Application
(continued)
To Connect Sustained (SPDT) ON-OFF-ON Contura Control Switch:
1. Connect pin 3 of the Control Switch to DC+ through a 2A (min) circuit protection device.
2. Connect pin 1 to DC ground.
3. Connect pin 2 to ACR “REMOTE” wire (red).
4. Connect pin 8 to DC+ through a 2A (min) circuit protection device.
5. Connect pin 7 to ACR “LED” ground wire (yellow).
1.965"
49.91mm
1.010"
25.65mm
.549"
13.95mm
1.125"
28.58mm
TEST CUT
HOLE IN
ACTUAL
CENTER
1.450"
36.83mm
0.830"
21.08mm
] These instructions are intended to provide assistance with the installation of this product, and are
not a substitute for a more comprehensive understanding of electrical systems. We strongly
recommend that a competent electrical professional perform the installation of this product.
] The illustrated wiring diagram represents a common installation and is not meant to be a guide for wiring
a specific vessel. The wiring diagram shows a single battery bank installation.
] Disconnect all negative battery connections before beginning the installation.
] All unused control wires should be carefully insulated from each other and from accidental contact
using heat shrink tubing or electrical tape. External contact or shorting between control wires can lead
to malfunction.
CAUTION
Manual Control Override Knob PN 7622 / PN 7623
The Manual Control Override Knob provides:
• an added level of safety that allows manual ON-OFF control with or without power
• LOCK OFF for servicing the electrical system
Remote LEDs in control switch indicate when ML-Series ACR is in manual override condition.
Manual Control Override Knob Operations* †
To combine battery banks
With Override Knob in REMOTE position,
push button until latched (Push to Latch On).
To isolate battery banks that
are connected
Rotate Override Knob to right to release button
from Latch On mode (button pops up). Rotate
Override Knob to left (REMOTE position).
To prevent remote operation
Rotate Override Knob to right
(LOCK OFF position).
To secure for servicing
With Override Knob in LOCK OFF position,
pass cable tie through hole.
1 2
* Operating the Manual Control Override Knob will override automatic operation of the ML-Series ACR for
10 minutes if the override forces a change in switch state.
† The ML-Series ACR will wait 10 minutes if it attempts to automatically close while the manual knob is
rotated to LOCK OFF.
990180180 Rev.004