Trelawny TCG 250, Operation And Maintenance Manual

PAGE 10

TCG250 Floor Grinder

starting

Machines fitted with electric motors

Inspect the supply cable; Check that no damage has been 
caused to the outer casing and that there are no exposed or 
loose wires. Obtain the assistance of an electrician if a fault 

is found. Do not use the machine until it has been rectified. 

Check that the cable is not running across sharp or jagged 
edges and that it is not in contact with any liquid.

It is recommended that the ‘jacking stand’ is employed to 
start the machine. To engage the stand, tilt the machine to lift 
the grinding head(s) and, whilst tilted, depress the foot pedal 
(at the rear of the machine, between the wheels), keeping 
it depressed whilst lowering the machine back towards its 
normal working position. This action will result in the front 
of the machine appearing slightly raised. To disengage the 
stand ready for use, tilt the machine rearwards slightly and the 
stand will be heard to retract. The grinding head(s) will now be 
engaged with the working surface.

Turn red isolator knob to the “ON” position. The machine 
is now energised. To start the machine, depress button 
(“Deadman’s handle”) and keep depressed.  As soon as the 
button is released, the machine will stop.

PRE-START CHECK

ALL VERSIONS

Check all bolts and screws for tightness. Ensure that all fittings 

are secure. Check the drive belts for correct tightness. There 
should normally be approximately 13mm (1/2”) of free play 
when the belt is depressed in the middle position between 
the two pulleys. To check and set the belt tension, refer to the 
Belt installation & Adjustment section.

The TCG250 is supplied with a specially commissioned 
electric motors and starter switch assembly.
Each unit is fully tested and the overload relays have 
been calibrated and set according to the manufacturer’s 

specifications.

In the event of malfunction on a new machine, the owner 

should first check that the power supply on site is suitable and 

adequate.

All cables should be fully uncoiled and never left wrapped 

around cable reels or tied in loops. The starter box is fitted with 

a safety feature to protect the motor and relays from damage. 
Should an overload condition occur which triggers the thermal 
overload within the starter, rotate the isolator switch to the 
“OFF” position.

Note that the circuitry may have to cool down for a period 
before the overload switch can reset itself upon depressing 
the stop button.

The starter boxes are preset and under no circumstances 
should they be tampered with, stripped down or adjusted, 
otherwise it will invalidate the warranty.

110v Motor

The motor requires the minimum of a 32amp, 110v power 
supply. Always use the shortest possible length of extension 
cable. The 110v machine requires the use of 4mm2 
extension cable up to a maximum of 20 metres, as it draws 

a significant operating current.  The use of 2.5mm2 for 110v 

machines is not recommended and can cause operating 
problems, particularly in conjunction with poor supplies, 
where excessive voltage drops will be encountered and 
damage to the machine may occur. Use a centre tap 
transformer with a continuous rated output of at least 3.0KVA. 
In practice this means that a 5.0KVA transformer must be 

used. Manufacturers have different methods of rating their 
equipment. All transformers and cables should be fitted 

with 32amp plugs and sockets. The 230v supply to the 110v 
transformers ideally should be rated to at least 20amp if 
supply problems are to be avoided. 

230v and 415v Motors

Take particular care when using 230v or 415v machines, 
ensure that the electrical supply is earthed and that breakers 
and fuses are correct for the loading. The 230v motor requires 
the minimum of a 13amp, 220v power supply. The 415v motor 
requires the minimum of a 10amp, 380v power supply. Always 
use the shortest possible length of extension cable. To avoid 
voltage drop the cable must have a minimum core wire size 
of 2.5mm

2

 cross-section area. Maximum length of cable 50 

meters.

CAUTION! Beware of poisonous fumes coming from 
engine versions. Start and operate only in well-ventilated 
areas.

BE CAREFUL! The exhaust and other engine parts are hot 
during and for some time after operation. Do not touch 
them.

IMPORTANT! 415v 3 phase versions only: Ensure the supply 
cable is of a 5 core construction and that all contacts 
within the plug and socket are wired in accordance with 
regulations. The control electronics require the neutral 
circuit to be functional.  If 4 core cable is used, where no 
functioning neutral is present, the machine will not start 
or run.