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5.5.1 Power Relay Module
The power relay module kit contains one 50 amp normally closed relay with connecting lugs in a NEMA type 3R enclosure.
Connect up to four (4) power relay modules to the load management devices listed above.
The power relay modules can be mounted indoors or outdoors. Two (2) 120 VAC loads (shed simultaneously) or a single 240
VAC load can be wired to each relay.
For detailed installation and connection instructions, see the installation instructions provided with the power relay module kit.
Figure 45 Power Relay Module
5.6 PowerSync Automatic Paralleling Module (APM)
The PowerSync
®
Automatic Paralleling Module (APM) allows the use of two Model 14RCA or two 20RCA generator sets in a
single-phase paralleling system to supply power to one building or site. See Figure 46.
The APM provides a common connection point for paralleling generators and permits individual control of the generator
connections, allowing for synchronization, redundancy, and generator management.
Generator management provides these features and benefits:
1. Generator management runs one generator set when power requirements are low, and automatically starts,
synchronizes, and connects the second generator set when the load increases.
2. Longer generator life: Smart generator management automatically operates the generator with the lowest operating
hours first, splitting the run time evenly between the two generator sets and extending the life of both units.
3. Redundancy: If one generator set requires service or even fails, the other generator set is still available to provide
power to your critical electronics.
4. Dual fuels: Allows operation of one generator set on natural gas and the other on LPG, if desired.
5. Simultaneous exercise: Setting the exercise time and date on one generator set schedules both generator sets to
exercise at the same time.
6. Power during generator service: Customer override allows maintenance or service to one generator set while the other
continues to run.
The following combinations of single-phase generator sets can be paralleled:
1. Two single-phase model 14RCA generator sets with the 120/240 volt single-phase configuration.
2. Two single-phase model 20RCA generator sets with the 120/240 volt single-phase configuration.
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