Pramac GA20000 Owner'S Manual Download Page 29

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Operation

Owner’s Manual for 50 Hz Air-Cooled Generator Sets

Automatic Transfer Operation

Proceed as follows to select automatic operation:

Verify generator set is not running.

Verify normal mains power source voltage is avail-
able to loads connected after transfer switch.

Press AUTO mode button on control panel.

Verify MLCB (generator disconnect) is set to ON

(CLOSED).

Generator set will start automatically when mains power
source voltage drops below a preset level. Loads are
transferred to standby power source after unit starts.

Automatic Sequence of Operation

Mains (Utility) Power Failure

If  generator  set  is  set  to AUTO  when  mains  power  fails
(below 264 volts), a five second line interrupt delay timer
starts (voltage and delay time are dealer programmable).
The  engine  cranks  and  starts  if  mains  power  is  still
unavailable when timer expires. An engine warmup timer
will  be  initiated  once  started.  Timer  duration  varies
depending on whether or not Cold Smart Start is enabled.
The  controller  will  transfer  load  to  generator  set  when
warmup time expires. If mains power is restored (above

350 volts; dealer programmable) at any time from initia-
tion of engine start until generator set is ready to accept
load (warmup time has not elapsed), controller completes
start cycle and runs generator set through its normal
cooldown cycle. However, load will remain on mains
power source.

Cranking

The system will go through five cyclic cranking cycles as
follows: 16 seconds cranking, 7 seconds resting, 16 sec-
onds cranking, 7 seconds resting, followed by three addi-
tional cycles of 7 seconds cranking followed by 7

seconds resting. An alarm will be triggered if generator
set does not start after five attempts.

Cold Smart Start

The Cold Smart Start feature is factory-enabled, but can

be  disabled  in  the  EDIT  menu.  The  generator  set  will
monitor  ambient  temperature  when  Cold  Smart  Start  is
enabled.  The  warmup  delay  will  be  adjusted  based  on
prevailing conditions.
If  ambient  temperature  is  below  a  fixed  temperature
(based on model) upon startup in AUTO mode, generator
set will warm up for 30 seconds before a load is applied.
The generator set will start with normal warmup delay of
five  seconds  if  ambient  temperature  is  at  or  above  the
fixed temperature.
A  check  for  correct  output  voltage  buildup  is  performed
when generator set engine is started.

If some condition impedes normal voltage creation, such

as frost crystals or dust/dirt preventing a good electrical
connection, start sequence will be interrupted for a clean-
ing cycle of internal electrical connections.

Cleaning Cycle

The cleaning cycle is an extended warmup period which

lasts for several minutes as normal generator set voltage
output is determined to be low. During this cycle, genera-
tor set controller will display “Warming Up” on the display
screen.
The generator set controller display will show “Under
Voltage” if cleaning cycle fails to clear obstruction. After
several minutes, alarm message can be cleared and the
generator set restarted.
If problem persists, make no further attempts to start.
Contact an IASD.

Load Transfer

Load transfer priorities when generator set is running

depend upon transfer switch design. See transfer switch

owner’s manual.

Shutting Generator Set Down While

Under Load Or During A Mains Power

(Utility) Outage

IMPORTANT NOTE: To avoid equipment damage,
follow these steps, in order, during mains power out-
ages. Shutdowns may be required during mains

power outages to perform routine maintenance or to

conserve fuel.

To turn generator OFF:

Turn off mains power supply to transfer switch