Elec
trical
6 - 5
Electrical
EP800AD (Acrobat™ HPU)
Relays
Motor Relay (SSR) – K1 –
Receives a 24 VDC signal that enables the passage of
power to the motor.
Hydraulic Valve Controller –
K2 –
A low power 24VDC relay that routes the
proper pressure command signal to the electronic valve controller.
Hydraulic Valve Controller – K3 –
A low power 24VDC relay that routes the
proper pressure command signal to the electronic valve controller.
Electrical Receptacles
The HPU uses current sensing and logic to actively control the power to the heater
receptacle. If the facer receptacle current sensor senses that the facer is on or if the
HPU motor is running the heater receptacle will be disabled. Otherwise the heater
receptacle will be enabled.
Theory of Operation (Electrical)
With the unit plugged-in, the following is the manner of operation for the machine.
Power Section
•
The user toggles on the ON/OFF power switch. This allows power to the machine
components. Simultaneously, the ON/OFF switch light will come on, indicating to the
user that power is sensed by the unit.
•
If power draw exceeds the rating of the breaker within the ON/OFF switch, the
switch will trip and disable the machine. To troubleshoot the machine, prior to
restoring power after a breaker trip. A manual reset of the ON/OFF switch is needed
to restore power.
•
The line filter conditions the power traveling through the ON/OFF switch.
•
Power goes from the line filter to terminal blocks 1 and 2 for distribution to the motor
and Power Supply.
•
Power for the power supply goes through the fuses to the power supply. The power
supply converts the AC voltage to a 24VDC voltage.
•
DC voltage travels through an ATC style 3A fuse and is distributed through Terminals
3 – 7 to the different DC components of the HPU unit.
•
The hour meter begins to record machine run time when it senses 24VDC at Terminals
3 – 7 (indicated by blinking hourglass). Hours are displayed even when the power is
off.
