Intellitec RV Electrical Parts Product Information
Isolator Relay Delay/E
Intellitec’s Battery Isolator Relay Delay/E offers a low cost,
reliable approach to charging multiple batteries. Unlike diode
isolators, this system provides an engine driven alternator
with the opportunity to begin charging the main battery
before connecting the auxiliary battery. This allows the use
of self-exciting alternators and lets the engine briefly warm
up prior to placing the load of a heavily discharged auxiliary
battery on the alternator. The unit is available in both 12 and
24 volt versions.
The unit is fully encapsulated in a plastic enclosure for
mounting in the engine compartment with two screws. It
operates in combination with a conventional continuous duty
cycle isolator relay that has been used by a number of
vehicle manufacturers. There are three (3) wires to connect
to the delay unit: one from an ignition switched 12 volt
source, a ground and the isolator relay coil.
It operates by sensing the voltage on the main 12 volt
system. When this voltage goes above 13.3 volts for
approximately 12 seconds, as happens when the engine
is running normally (normal alternator output voltage is
approximately 14.4 volts), it will close the isolator relay
providing charging current to the auxiliary battery. When
the ignition switch is turned off, the relay will open
immediately.
stop supplying current to the isolator relay, preventing the
load of the auxiliary battery from stopping the engine.
If the voltage should drop below 12.0 volts for more than two
seconds while the engine is running, the relay will drop out.
This might happen when the alternator is not able to supply
sufficient current to all the loads and charge the auxiliary
battery.
Maximum Continuous Carry Current: 10 Amps Max.
When the main battery voltage rises above 13.3 volts again,
the relay will again close in about 2 seconds to retry charging
the auxiliary battery. The resultant flicker of the lights will alert
the driver of the system overload.
IRD/E with Cont. Duty Solenoid: 00-00629-512
Specifications
12 volt
Part Number: 00-00629-120
Maximum Ambient Temperature: 185 Degrees F.
Minimum Ambient Temperature: - 40 Degrees F.
24 volt
Part Number: 00-00629-240
How It Works
Maximum Continuous Carry Current: 10 Amps Max.
The Isolator Relay Delay senses the voltage on the main
battery of a multiple battery system, and supplies power to
the coil of an isolator relay when the voltage on the main
battery rises above 13.3 volts (26.6 volts on 24 volt system).
If the voltage falls below 12.0 volts (24 volts on 24 volt
system) the unit will
Maximum Ambient Temperature: 185 Degrees F.
Minimum Ambient Temperature: - 40 Degrees F.
IRD/E with Cont. Duty Solenoid: 00-00629-524
Isolator Relay Delay/E
Schematic
Isolator Relay Delay/E
Service Manual
The Battery Isolator Relay Delay/E is a reliable approach to
charging multiple batteries on a vehicle. It provides a delay
to allow the engine to briefly “warm up” and to recharge the
main battery before placing the heavy load of a discharged
auxiliary battery on the alternator. It also allows the use of
self-exciting aternators.
How It Works
Isolator Function
The unit operates as an isolator by sensing the level of
voltage on the chassis 12 volt system. When this voltage
goes above 13.3 volts for approximately 12 seconds, as
happens when the engine is running normally (normal
alternator output voltage is approximately 14.4 volts), it will
close the isolator relay providing charging current to the
coach battery. When the ignition switch is turned off, the relay
will open immediately.
If 12 volts is applied to isolator relay coil, check
for voltage drop across the isolator relay
contacts. If the drop is greater than 0.3 volts,
replace relay.
Problem
Chassis battery continues to drain
Possible Cause / Solution
Check voltage on module with ignition off. (Red and Blue
wire) should be 0 volts. If not, check wiring.
Check for continuity across the isolator relay contacts, the
relay should be open with no voltage applied to coil.
If the voltage should fall below 12 volts for more than two
seconds while the ignition is on, the relay will drop out to
feed all the alternators available output to the chassis battery
to keep the engine running. This might happen when the
alternator is not able to supply sufficient current to all of
the loads. When the chassis voltage goes above 13.3 volts
again, the relay will again close in about two seconds to retry
and charge the coach battery. The resultant flickering of lights
would alert the driver of the system overload.
Trouble Shooting
Problem
Coach battery not charging
Possible Cause / Solution
With engine running, chassis voltage must be above 13.5
volts (Blue wire) If less 13.3 volts, check vehicle’s charging
system
Check ground on module (Black wire)
Check for voltage on coil of isolator relay after engine has
been running for at least 20 seconds. (Red wire). Voltage
should be approximately 12 volts. If no voltage, replace
IRD/E.
CAUTION:
The Isolator Relay Delay/E controls the Isolator Relay
which is connected directly to the chassis and coach
batteries. Power from both the batteries is fed into the
module. The full power of the battery is available at this
module. Inadvertant shorts at this box could result in
damage and/or injury.
All servicing of this module should be done only by a
qualified Service Technician
Tools required: Low current Test Light, Accurate
Voltmeter (digital read-out preferred)
Isolator Relay Delay/E
Typical Installation Diagram
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