131 Eisenhower Lane North
Lombard, IL 60148
630.268.0010 / 1.800.251.2408
P/N 53-00684-200 Rev. A 071301
www.Intellitecsve.com
Intellitec
INSTALLATION & SERVICE MANUAL
TM
50 AMP Smart Energy Management System Model 900
The remainder of the relays: relays 5 and 6, are intended to switch low voltage loads. Relays 5 and 6 are single-pole,
double-throw relays, with all contacts available. These relays are intended to control air conditioners, or other appliances
equipped with low voltage controls, or thermostats. The contacts of the relays are typically wired in series with the low
voltage controls or thermostats of air conditioners so the
EMS
turns off only the compressor, or the compressor and fan.
These circuits could also control other 120 volt appliances, if an additional control relay is added externally.
OPERATION IN VEHICLES USING AVAILABLE SERVICE
The
EMS
is turned on by the presence of 120VAC, or 240VAC at the L1 or L2 inputs (J6, pin 3 and 1 respectively). This
feature is intended to prevent the
EMS
from drawing current from the +12 VDC battery supply when not in operation.
When 120 VAC or 240 VAC power is applied, the system automatically powers up and determines the nature of the power
source. There is a two-minute start-up delay built into the system to prevent short-cycling of motor driven loads. During
this delay period, the Load Meter display will exibit rotating segments, indicating to the user that the system is in the delay
mode. After the initial two-minute delay, the unit will apply power to controlled loads sequentially, with a one-second delay
between each load to prevent power surges generated by simultaneous application of all loads.
If the generator is running, 120 VAC will be present at the L1 and L2 inputs and a +12 VDC signal will be present at J2 pin 2
on the Control Module. The
EMS
will assume that 120 VAC, 45 or 60 Amp Genset power is available and the energy
management feature will be enabled. The Control Module sends a signal to the Display Module causing the load meter to
display actual load current, the GEN SET service indicator to light and all power status indicators to light.
The generator source mode takes priority over all other modes; that is, if the generator is running, the
EMS
will operate in
that mode independent of the presence of other sources.
If 120 VAC is present at the L1 and L2 inputs and no +12 VDC signal is present at J2 pin 2 on the Control Module, the
EMS
will assume that 120 VAC, 30 Amp shore power is available and the energy management feature will be enabled. If only
20 Amp service is available, the user must select the 20 AMP service mode by momentarily pressing the 20/30 Amp select
switch on the Control Panel.
If 240 VAC, 50 Amp service is available, the energy management feature is disabled and all control relay contacts are
closed, energizing all of the controlled loads. The Control Module sends a signal to the Display Module which causes the
load meter to go blank, the 50 AMP service indicator to light, and all power status indicators to light.
Initially, the control turns all loads on with a one-second interval and the total current is monitored. If the total current
should exceed the service limit, the system will turn off the first load in the shedding table. As it turns the loads off, it
calculates the amount of current that was removed, which is the value for that load. This value is placed in memory. If the
current remains above the service limit, the system will turn off the next load in the shedding table. Again, it calculates the
amount of current that was removed and places the value for that load in memory. The system continues to turn off loads
until the total current falls below the service limit, or all of the six controlled loads have been shed. Through this process,
the system has "learned" the amount of current that each particular load draws. This feature compensates for the
differences in current draw over a range of line voltage and ambient temperature, by re-learning the load each time it is
turned off or "shed".
TM
The
50 Amp Smart EMS Model 900
now waits until the total current is lower than the service limit and enough current is
available (as compared with the amount in memory for the last load shed) before it will turn that load back on. This assures
that there is sufficient current to operate the load.
Note:
There is a two minute minimum delay period after a load is shed before the load will be turned back on again,
to prevent air conditioners from turning on with a head of pressure.
