General Information and Setup
Owner’s/Installation Manual for SMM
3
Section 2: General Information and Setup
Load Management Options
Load management systems are designed to work
together to prevent a generator from being overloaded by
large appliance loads. Options include:
•
Smart Management Modules (SMMs)
•
Smart A/C Module (SACM)—standard in single-
phase 100-800 Amp RTS or RXS transfer
switches.
These options can be used in conjunction or separately.
Application Considerations
Generator overload condition is determined by generator
frequency. Loads are shed when frequency drops below
a preset value for a predetermined time.
A SMM can be used individually or in conjunction with a
SACM to manage a combined total of eight loads. SMMs
operate independently when used in conjunction with the
SACM.
•
Use Priorities A/C 1–4 on the SACM as the top pri-
orities, then up to four SMMs as Priorities 5–8.
•
Use only select A/C priorities on the SACM as the
top priorities, then use additional SMMs as the
remaining priorities.
•
To reduce the loads returned to the generator all at
once, it is best to set the SMM priorities to follow
after the last HVAC load has returned. This allows
the generator to accept loads gradually, reducing
the potential for additional nuisance load shed
events.
In any combination of modules, the recovery times after a
loss of utility power or shutdown due to overload are
shown in
NOTE:
For digital thermostats where a 24 VAC
thermostat wire is not available, an SMM must be used to
break the power at the HVAC load itself.
Smart Management Module (SMM)
Any 240V loads, including central air conditioners, can be
managed using a SMM. The system can accommodate
up to eight individual SMMs.
NOTE:
SMMs are self-contained and have individual
built-in controllers.
Table 2-1. Priority Settings
Priority
Recovery Time
SACM
SMM
1
5 minutes
Yes
Yes
2
5 minutes 15 seconds
Yes
Yes
3
5 minutes 30 seconds
Yes
Yes
4
5 minutes 45 seconds
Yes
Yes
5
6 minutes
NA
Yes
6
6 minutes 15 seconds
NA
Yes
7
6 minutes 30 seconds
NA
Yes
8
6 minutes 45 seconds
NA
Yes
