LS SERIES SERVICE MANUAL
ISSUE 4.0 OVERVIEW 11
1.14 Mains On/Off Switch and Main Input Fuses
The mains power switch is located at the rear of the machine. This is part of the mains input
module which contains the mains input fuses and voltage selector. The selected mains
voltage is displayed in the small window as shown below. Note that the fuseholder is
designed to use either 20mm fuses or 1-1/4 inch fuses but 20mm fuses MUST always be
used. Also note the fuse locations within the fuseholder.
1.15 Safeline Button and Emergency Stop Switch
The safeline button and emergency stop switch are located on the base at the left hand side
of the machine.
The red emergency stop switch is used to stop the machine in an emergency. It operates by
disconnecting the mains from the machine. The emergency stop is wired in series with the
mains input and will latch in the off position when the red mushroom is pushed downwards.
When the red mushroom is down, the mains power is removed from the machine. To release
the switch, rotate the red mushroom clockwise until it lifts by spring pressure.
The safeline circuit isolates the Motor Drive transformer from the Motor Drive Power Supply
until the operator has pressed the safeline button. This ensures that if the Motor Drive PCB
is faulty, the motor will not run when the machine is first switched on.
The safeline circuit contains a relay (K1), which has 2 sets of change-over (C/O) contacts.
The first set of contacts (4, 5 and 6) are used to power the safeline lamp and also provide a
"Hold-on" supply for the relay. The second set of contacts (1, 2 and 3) are used to connect
the transformer to the bridge rectifier on the Motor Drive PCB.
When the machine is first switched on, the safeline relay is de-energised and the yellow
safeline button is lit. The machine cannot be driven until the safeline is energised. If a jog
key etc is pressed, a "Safe Line Open" error message will be displayed on the Full Control
Console or an error number will be displayed on the Hand Held Remote.
When the yellow safeline button is pressed, the relay will energise, the light in the safeline
button will turn off and the motor power supply is connected.
Note that the fuses MUST be
fitted with one end against
the pin end of the holder
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