Load Transfer Panels; Engine Interface Module Description; Output Circuit Breaker Description - FG Wilson OLYMPIAN 1001 Series Manual

4.8 Load Transfer Panels

When the generating set is installed to automatically
provide standby power in the event of mains failure, a load
transfer panel is required. This transfer panel is designed
to sense when the mains have failed, signal the generating
set to start, switch the load from the failed mains to the
generating set and then switch it back after the mains are
re-established. See Figure 4.3
Figure 4.3: Function of a Load Transfer Panel
There are two standard ranges of Load Transfer Panels:
The ATI Series Intelligent Transfer Panels and the TC
Series Compact Transfer Panels.
4.8.1 ATI Intelligent Load Transfer Panel: The ATI
Intelligent Load Transfer Panel is designed to work with
the 2001, 4001, 4001E and PowerWizard Autostart Control
Systems to form an automatic mains failure system.
Status Panel: The front of the door has the status panel
and main control switch. This status panel has four
indicator LEDs as shown in Figure 4.4. Pressing the Lamp
Test Button will illuminate these indicator LEDs.
Item Description
1. "Mains Available" Status LED
2. "Mains on Load" Status LED
3. "Generator on Load" Status LED
4. "Generator Available" Status LED
5. No Generator or mains on Load Status LED
Figure 4.4: ATI Series Load Transfer Panel Status Display
Controls: The test key on the front panel has three
modes:-
AUTOMATIC MODE - The normal position for automatic
operation.
TEST WITHOUT LOAD - For testing the generating set
without connecting the load.
TEST WITH LOAD - For testing the generating set with the
load connected.
WARNING:
!
Internal maintenance should only be carried out
by trained personnel due to the high voltages
present inside the enclosure.
The ATI series Load Transfer Panel operates as follows:
On mains failure, the generating set is automatically
started and the switch transfers to connect the load to the
generator.
On restoration of mains power, the load is transferred back
to the mains. After a cool down period, the generating set
is automatically shut down.
Manual Retransfer Function: If enabled, this allows the
operator to manually control the timing of the retransfer of
the load from the generating set to the restored mains
supply. The control is a simple push button on the ATI
control module.
With the Manual Retransfer function enabled or disabled,
on mains failure the generating set will start and accept
load in the normal sequence. With the Manual Retransfer
Function disabled, the load will be automatically
retransferred back to the mains when available as
described above.
With the Manual Retransfer function enabled, on
restoration of the mains, the "Mains Available" indicator will
illuminate but the generator will continue to supply load.
When it is convenient for retransfer to take place, the
operator presses the Retransfer Button which causes the
load to be transferred back to the mains and, after a cool
down period, automatically shuts down the generator.
4.8.2 TC Compact Load Transfer Panel: The TC
Compact Load Transfer Panel is designed to work with the
Autostart Control Systems to form an automatic mains
failure system.
Status Panel and Controls: The status panel has two
indicator lamps. They show that the load is either
connected to the mains supply or to the generating set.
The controls consist of a Mode Selector Switch with three
positions:-
AUTOMATIC MODE - The normal position for automatic
operation.
TEST WITHOUT LOAD - For testing the generating set
without connecting the load.
TEST WITH LOAD - For testing the generating set with the
load connected.
The TC Series Load Transfer Panel operates as follows:
On mains failure the generating set is automatically started
and the contactors closed to connect the load to the
generator.
On restoration of mains power the load is transferred back
to the mains and the generating set is shutdown.
4.9

Engine Interface Module Description

The Engine Interface Module is a sealed, engine mounted
module that provides switching relays for the Starter Motor
Solenoid, Glow Plug and Fuel Solenoid. Each of these
circuits is protected with individual fuses mounted in the
module. Individual LED's illuminate when each circuit is
energised.
Overspeed Signal (EIM Plus only): The EIM Plus
monitors the speed signal from the magnetic pick-up. If
the engine speed rises above a certain pre-setable value,
the module sends a zero volt signal to the generating set
control panel to activate the Overspeed Fault circuitry.
The Overspeed Set Point is factory set at 55Hz for 50Hz
sets and 66Hz for 60Hz sets. This can be adjusted using
the adjustment screw accessed through the hole beside
the Overspeed Set-Up LED. While the engine is running
at the rated speed (1500 rpm for 50Hz or 1800 rpm for
60Hz) the adjustment screw should be adjusted until the
Overspeed Set-Up LED just goes out. This sets the
overspeed value at 10% above the speed at which the
generating set is operating.

4.10 Output Circuit Breaker Description

The alternator output circuit breaker is a miniature case
circuit breaker (MCB) of sufficient rating for the generating
set output. Electrical output is switchable through this
device, with "ON" being indicated by the handle being up.
The breaker will carry its rated current continuously but will
trip to off-position if the rating on any one phase is
exceeded for a period depending on the percentage
overload and the circuit breaker characteristics.
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