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Section 2: General Information and Setup
Load Management Options
Load management systems are designed to work
together to avoid 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.
•
SACM inputs 1–4 have fixed priorities of 1–4,
respectively. SMM's can be individually set to prior-
ities 1–8.
•
To reduce loads returned to the generator all at
once, it is best to set 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.
•
A SMM can share a priority with an A/C priority on
the SACM provided the generator is sized to han-
dle the combined surge load from both appliances.
•
Sharing priorities can allow up to 12 loads to be
managed in a correctly sized system.
In any combination of modules, recovery times after a
loss of utility power or shutdown due to overload are
shown in
Table
2-1.
NOTE: For digital thermostats where a 24 VAC thermo-
stat wire is not available, a SMM must be used to break
the power at the HVAC load itself.
Owner's/Installation Manual for SMM
Smart Management Module (SMM)
Any 240V loads up to 100A (resistive, 90A inductive),
including central air conditioners, can be managed using
a SMM. The system can accommodate up to eight indi-
vidual SMMs.
NOTE: SMMs are self-contained and have individual
built-in controllers.
Table 2-1. Priority Settings
Priority
Recovery Time
1
5 minutes
2
5 minutes 15 seconds
3
5 minutes 30 seconds
4
5 minutes 45 seconds
5
6 minutes
6
6 minutes 15 seconds
7
6 minutes 30 seconds
8
6 minutes 45 seconds
General Information and Setup
SACM
SMM
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
NA
Yes
NA
Yes
NA
Yes
NA
Yes
3
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Troubleshooting
