TLD GPU-4060 Series User Manual

Creation:03.09 — 2009 1-1-9
Description
The relay panel contains the following.
(1) Current Transformers, T4, T5, T6
The relay panel assembly contains 3 current transformers which are used to transform current
measurements to mili-volt signals to the Generator Control Module (GCM) for load sensing and
line drop compensation, for instrument panel indication, and for over-current protection.
(2) Contactor(s), K10
The function of the contactors is to allow, or not allow, 400 Hz output power from the generator
to the aircraft. The contacts state, open or closed, is controlled by the 28 VDC contactor coil.
(3) Output Plug Interlock Relay(s) and Circuit Description, K11
The function of the plug interlock relay(s) is to cause the output load contactor to open, via the
generator control module (GCM) in the event the cable plug connector becomes accidentally
disconnected from the aircraft during power delivery, or if an attempt is made to deliver power
when the output cable is not connected to the aircraft, or if the aircraft should reject the GPU’s
400 Hz power for any reason. 28 VDC for operation of the relay is supplied from the aircraft
either through an on-board transformer-rectifier or from a 28 VDC electrical system.
Connection from the aircraft to the interlock relay is made through terminals E and F on the
output cable plug connector.
(4) Output Test Bank Switch(es), S11
A SPST, toggle switch provides a means of bypassing the plug interlock relay when supplying
power to a load bank or to an aircraft not equipped with 28 VDC feedback.
(5) Starter Lockout Relay, K8
The function of the starter lockout relay is to not allow the engine’s starter motor to crank when
it is already running.
(6) Idle / Rated Speed Relay, K5
The function of the idle/rated speed relay is to allow the engine to run either at idle speed or
rated speed. When the idle/rated speed relay is de-energized, the engine is running at idle
speed. When the idle/rated speed relay is energized, it sends a signal to the speed control
unit, allowing the governor actuator to bring the shut off lever to the rated speed position.
(7) Engine Fault Relay, K4
The function of the engine fault relay is to make the engine go back to idle should an engine
fault, such as low oil pressure or high coolant temperature occur. When any of the above
conditions develop, the engine fault relay is de-energized by the Deutz ECM, which opens the
K4 engine fault relay contact, cutting power to the K5 rated speed relay. This causes 2 things
to happen. First, it tells the Deutz ECM to go to idle engine speed. Second, it cuts power to
the Generator Control Module (GCM), which cuts the signal to the generator field and causes
400 Hz output power to stop.
(8) Engine Cooldown Relay, K6
The purpose of the Engine Cooldown Idle Relay is to ensure the engine goes to idle for a
period of 1 minute prior to shutting down. This is a standard feature of the GPU-4060 series
Ground Power Units designed to protect the engine’s turbo from rapid temperature changes. It
will greatly improve the longevity of the engine and it’s logic must not be defeated, Nor should
the emergency stop switch be used to shutdown the engine under normal operation.

TLD GPU-4060 Series Specifications

General

Brand	TLD
Model	GPU-4060 Series
Category	Portable Generator
Language	English