Preheat Time; Number Of Start Attempts; Crank Timer; Start Detection (Rpm) - Generac Power Systems PowerManager PM-GC Manual

3.5.3 PREHEAT TIME

When a start command is received, the engine may
require preheating before the generator attempts to
start. If the preheat function is enabled, this parame-
ter allows the user to determine the time that the pre-
heat contact closes before activating the starter sole-
noid.

3.5.4 NUMBER OF START ATTEMPTS

This parameter will determine how many times the
engine will crank in an attempt to start the engine.
For example, if it is set to two (2), the engine will
crank two (2) times with a pause in between each
crank cycle. If it fails to start, an overcrank alarm will
be displayed.

3.5.5 CRANK TIMER

Once a start command has been received and the
preheat time has expired (if enabled), the starter
solenoid will be engaged. This parameter allows the
user to determine how long the starter solenoid is
engaged before the start attempt is regarded as hav-
ing failed. If the generator does not start within this
time, the generator will wait for a preset time before
attempting to start again. The user also can program
the number of start attempts.

3.5.6 START DETECTION (RPM)

This is the speed at which the engine should be self
sustaining and the point at which the starter disen-
gages. It is changeable by the user and is normally set
to 500 rpm.

3.5.7 PAUSE BETWEEN CRANKS TIME

If the generator does not start within the pro-
grammed start time, it will pause before trying to
start again. This parameter determines the length of
that pause.

3.5.8 COOL DOWN TIME

This parameter determines the length of time that the
generator continues to run after a stop command is
sent in AUTO mode in order to cool down the engine
with no load.
If the key-switch is turned to the OFF position
when the generator is running, it will stop imme-
diately regardless of this setting.
NOTE:
Section 3 — Operation

3.5.9 WARM UP TIME

Some applications require that the generator run for
a given time before a load is applied. This parameter
allows the user to set that time. Normally, it will be
set to zero seconds. The generator is ready to accept
load when this timer expires.

3.5.10 ALARM HOLD OFF TIME

Once the engine has started, some alarm functions
(such as low oil pressure and under speed) are not
activated immediately since the engine must be given
time to reach a stable condition. This parameter
determines the time that elapses before the hold off
alarms are activated.

3.5.11 LOAD ACCEPT FREQUENCY

This is the minimum frequency the generator must
reach before the system will accept load.

3.5.12 LOAD ACCEPT VOLTAGE

This is the minimum voltage the generator must
reach before the system will accept load.

3.5.13 LOW VOLTAGE LIMIT

This parameter normally sets the tolerance limits for
utility voltage in a single standby system.

3.5.14 HIGH VOLTAGE LIMIT

This parameter normally sets the tolerance limits for
utility voltage in a single standby system.
3.6

TARGET FREQUENCY

This parameter sets the nominal output frequency.
3.7

TARGET VOLTAGE SETPOINT

This parameter sets the nominal output AC voltage.
3.8 PROGRAMMABLE ALARMS
SETPOINTS
The following table shows a typical default setup for
alarms, the settings are protected from editing by a
security system involving one time passwords, con-
tact Generac for details and advice if these settings
need to be changed.
Generac
PM-GC
® Power Systems, Inc. 11