Overcrank Shutdown; Rpm Sensor Loss Shutdown; Dc Fuses; Control System Components - Generac Power Systems PowerManager PM-PC Manual

OVERCRANK SHUTDOWN

After a pre-specified duration of cranking, this function ends the
cranking if the engine has failed to start.

RPM SENSOR LOSS SHUTDOWN

If the speed signal to the control system is lost, engine shutdown
will occur.

DC FUSES

The fuses are located on the inside of the relay box. They protect
the panel wiring and components from damaging overload. If a
fuse is missing or damaged, the power module may not start or
crank. The fuses must be replaced with fuses of the same size,
type, and rating as originally provided by Generac.

CONTROL SYSTEM COMPONENTS

AVR POWER MODULE

The AVR power module houses the power electronics that drive
the field of the alternator. The PM-PC/GC actually controls the field
and the AVR module converts the PM-PC/GC output signals to
required power levels. The AVR module controls the output voltage
and voltage stability of the generator. The Dynamic response of
these parameters can only be adjusted via GenLink™ with the cor-
rect security access. Each engine has its own AVR module.

THROTTLE ACTUATOR MODULE

The Throttle Actuator Module houses the power electronics that
drive the throttle actuator. The PM-PC/GC actually controls the
throttle actuator and the Throttle Actuator Module converts the
PM-PC/GC output signals to required power levels. This module
controls the engine speed and stability, nominally set at 50 or 60
hertz. The speed and dynamic response of these parameters can
be adjusted via GenLink™. However, the dynamic response
parameters are protected by security access. Each engine has its
own Throttle Actuator Module. On engines with a separate Engine
Control Module (ECM) using SAE J1939 CAN bus communica-
tions, the ECM is driving the throttle actuator under the command
of the PM-PC/GC control system.

AIR/FUEL RATIO CONTROL MODULE

The air/fuel ratio control module houses the power electronics that
drive the solenoid that controls the air/fuel mixture. It converts the
PM-PC/GC output signals to the required power levels to drive the
solenoid.

BATTERY CHARGER

Each engine is provided with a Generac battery charger. Each bat-
tery charger must be wired by the customer to a separate 120 VAC
standard utility supply.

FIELD WIRING

Wiring must comply with ALL local and

national codes. Only qualified personnel
knowledgeable of these local and national
codes should perform any wiring to and from
the generator.

CONNECTING TO THE GENERATOR

The size and temperature ratings of the conductors to be con-
nected to the output of the generator is dependent on a variety of
factors. Refer to Article 310 of the National Electric Code and
check local codes for conductor selection. Different circuit break-
ers may only be capable of accepting a certain quantity, size, or
type of conductor. The acceptable AWG range, type of conductor
to be used, and the tightening torque of the lugs on the standard
Generac contactor are listed directly below the circuit breaker
itself.

CONNECTING TO THE MODULAR POWER SYSTEM (MPS)

Connecting to the MPS is achieved by connecting directly to the
contactor located in the connection box opposite the circuit
breaker. The contactor's connectors are capable of accepting
conductors ranging from 350 MCM to 6 AWG. Check all national
and local codes for proper conductor sizing. The connector part
number and tightening torque are as follows:
Part Number Tightening Torque
057329 (1-2) 375 in - lb (Al/Cu)
(1-2) 200 in - lb (Al/Cu)

UTILITY SUPPLY CONNECTIONS (18.0L AND 22.0L ONLY)

The utility supply connections for the block heater, battery charger,
and any other option is located in the AC breaker distribution panel
near the back of the generator. Depending on the current rating of
the terminal block used, the connector tightening torque values
and the acceptable wire ranges are listed as follows:
Connector Current
Tightening Torque
Rating
30 Amp Connectors 5.5 lb.-in. (0.6 Nm)
50 Amp Connectors 10.6 lb.-in. (1.2 Nm)
65 Amp Connectors 18.0 lb.-in. (2.0 Nm)
The current ratings are located directly on the circuit breaker.
The above information is rated for UL acceptance.

Installation

Wire Range
350 MCM - 1 AWG
2 AWG - 6 AWG
Acceptable Wire
Range
(1-2) 24-10 AWG
(CU)
(1-2) 22-8 AWG (CU)
(1-2) 20-6 AWG (CU)
NOTE:
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