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Please read this manual before operating your
ACR-160 Automatic Charge Isolator
Description
The ACR-160 microprocessor controlled battery isolator
is used in starter and auxiliary battery systems like on
boats, RV, service vans. It supervises the starter state
of charge and, therefore, avoids starting problems.
The ACR-160 can also be used as a voltage dependent
switch. The working principle is the following:
- The ACR-160 lets the starter battery be recharged by
the alternator until a voltage of 13.2V (26.4V) during
at least 7 seconds is reached. Then the two batteries
are put in parallel by the contact of the relay.
- The secondary users are normally connected to the
auxiliary battery. The relay opens when the batteries
voltage reaches 12.8V (25.6V) during at least 60 sec-
onds. This way the starter battery remains charged. If
a battery charger is connected to the auxiliary battery
and this battery reaches a voltage of 13.2V (26.4V)
during at least 7 seconds, the relay closes and charges
at the same time the starter battery. This is an ad-
vantage if the vehicle remains stationary over a long
period of time. If the battery charger is disconnected
and the battery voltage reaches 12.8V (25.6V) during
at least 60 seconds, then the ACR-160 separates again
the two batteries.
Start Assistance
The ACR-160 has an additional connection enabling an
assistance to the starting. If the connection STATUS is
connected to the starter contact, the ACR-160 contact
closes and this way the 2 batteries contribute to the
engine start. Caution: When this function is used.
Very high currents may go through the relay contact
by the start of bigger engines. these high currents may
damage the contact of the aCR-160 if they exceed its
nominal current.
Voltage Dependent Switch
In some cases, it is needed to have a powerful DC source
supply but only when the engine is running. The ACR-
160 allows also this kind of installations.
It is sufficient to simply connect "+" of the starter bat-
tery to the connection A1, the system ground to the
connection MINUS and the positive of the equipment to
be supplied to the connection A2. When the engine runs
and a voltage of 13.2V (26.4V) during at least 7 seconds
is reached, the equipment is then powered through the
contact of the ACR-160.
Remote Indication of Relay ON Condition
Connect external LED as shown.
Disable Relay Permanently
Use external switch as shown.
Protection Against Over Voltages
The ACR-160 has also a function enabling to
protect the battery and the appliances that are
connected to it against an over voltage generated,
for instance, by a defective alternator. As soon as a
voltage higher than 16V (32V) is detected, the
contact of the ACR-160 opens immediately.
2 | SAMLEX AMERICA INC.
Installation & Handling
Installation
To implement the function «start assistance», a fuse
protected connection has to be carried out between the
connection STATUS and the contact of the starter con-
tact. a short-circuit between the positive and negative
of the batteries can damage your system. Make sure
that the connections are properly done!
Technical Specifications
Supply ....................... Automatic detection 12/24V
Max. current .....................................................160A
Peak current .......................... 480A for 250 millisec
Battery connection ............................................ M8
other connections .......................... Faston 6,3 mm
Cable cross section ...................................... 50mmq
Consumption oFF ..........12V=1.8mA / 24V=2.0mA
Consumption oN .........12V=340mA / 24V=170mA
Minimum charge time ........................... 60 seconds
Fast opening: < 11.8V (12V) / 23.6 (24V) after 4 sec
Dimensions: 106.4 x 73 x 57.2 mm / 4.2 x 2.9 x 2.3 in
Weight: 0.46 kg. / 1.0 lb.
Connections
A1: Positive terminal of the starter battery
A2: Positive terminal of the auxiliary battery
(If the function «voltage dependent switch»
is needed, connect the equipment positive here).
STATUS:
1. Contact to "+", relay is closed (Start assistance)
2. No connection on STATUS , normal operation
3. Contact to "–", relay remains open
MINUS: Negative terminal
(Caution - this connection must always
remain connected via a fuse of 1a)
LED: Connection for remote indication
for status of ACR-160)
CAUTION!
Wire sizes to be based on
maximum current and 2%
voltage drop.
Fuses to match wire sizes.
AWG
#16
External
switch to
disable
the relay
AWG
permanently
#16
External LED
to indicate
activation
of relay
1A
AWG
#16
–
+
ALTERNATOR
1A
1A
A1
STATUS
MINUS
LED
A2
200A
ACR-160
EXTERNAL
CHARGER
+12VDC (+24VDC)
To the starter contact
(optional, see installation)
+
–
STARTER
BATTERY
1A
AWG
#16
+
–
AUXILIARY
BATTERY
+ –
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