Generac Power Systems PowerPact 6561 Installation Notes page 82

Priorities 1-2, 3-4

Priority 1 and 2 have connections for both 1 air conditioner and 1 contactor (PMM).

Both an air conditioner and contactor (PMM) can be used at the same time if desired.

To control an air conditioner, no additional equipment is required. Internal relays interrupt the
thermostat 24VDC control signal to disable the air conditioner load.

Priorities 3 and 4 have connections for one contactor (PMM) only.

4 LEDs located on the OPCB will indicate when a load priority is enabled. When loads are connected,
the LEDs will be illuminated.

Any loads including central air conditioners can be controlled via a contactor (PMM) that must be
purchased separately.

Up to 4 contactors (PMMs) can be controlled by the OPCB (24VDC or 120VAC is supplied through the
OPCB to energize each contactor coil).
Generator Overload Condition

Generator overload condition is determined by generator frequency.

Loads are shed when the frequency is less than 58Hz for 3 seconds or less than 50Hz for 1/2 second
(for 60Hz).

The OPCB has a test button that forces the unit to act as if an overload has occurred.

This button operates even when the transfer signal is inactive.
Power Management Module and Kit
 The Power Management Module (PMM) is not supplied with the transfer switch. You will also need a
PMM Kit consisting of a 24VAC supply class-2 power supply transformer and your 1st PMM Module.
 The 24VAC Transformer mounts inside the transfer switch and connects to the OPCB :
 Blue wire - OPCB Load Supply 1 terminal
 Black wire - OPCB T1 terminal
 White wire - OPCB Neutral terminal
 Yellow wire - OPCB Load Supply 2 terminal
 You may also still use the old DLM modules by using a jumper from OPCB Load Supply 1 to OPCB T1,
and OPCB Load Supply 2 to OPCB)Neutral. (This will supply the DLM modules with 120VAC)
**** CAUTION! *** The Load Supply Voltage on the OPCB terminals MUST MATCH the PMM/DLM coil voltage
or the equipment will be damaged.
Priorities 1-2, 3-4

Priority 1 and 2 have connections for both 1 air conditioner and 1 contactor (PMM).

Both an air conditioner and contactor (PMM) can be used at the same time if desired.

To control an air conditioner, no additional equipment is required. Internal relays interrupt the
thermostat 24VDC control signal to disable the air conditioner load.
•Priorities 3 and 4 have connections for one contactor (PMM) only.

4 LEDs located on the OPCB will indicate when a load priority is enabled. When loads are connected,
the LEDs will be illuminated.

Any loads including central air conditioners can be controlled via a contactor (PMM) that must be
purchased separately.
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