Edwards ELD500 Series

D135-10-880C - Maintenance
Page 91
Remove the oil fill plug and fill in with fresh oil.
Screw the oil fill plug back in.
The tightening torque for the bolts has been specified at 10 Nm.
Cleaning
The housing of the ELD500 is made of painted plastic parts. Thus for the purpose of cleaning,
only such agents should be used which are generally also used for other painted or plastic
surfaces (mild household cleaning agents, for example). Normally a moistened peace of cloth
will do. Never use any solvents which are capable of dissolving paint (like acetone, toluol, and
so forth).
A soft brush or a vacuum cleaner is recommended for cleaning the ventilation slits.
Exchanging the fuses
1. Switch the ELD500 off.
2. Pull the mains cord off the ELD500.
3. Use a screwdriver to fold out the lid of the mains socket from the right (the mains
switch is not affected by this).
4. The fuses can be removed by pulling the drawers out which are marked by the arrows.
When reinserting these make sure that the arrows point downwards.
5. In any cases two fuses of the same rating must be inserted. The required mains fuses
are: T 10A slow blow (20 x 5 mm dial.) for 100 to 230 V a.c.
6. After having exchanged the fuse (s) press the lid of the mains socket firmly back on.
7. Insert the mains cord into the ELD500 and switch the instrument on.
Beside these mains fuses several internal circuits are fused separately. These fuses are listed
in the following table (see Figure 42).
To exchange these fuses proceed as follows:
1. Switch the ELD500 off
2. Pull the mains cord on the ELD500
3. Remove the cover for the mechanical and electronics section according to Opening of
the ELD500.
4. Exchange fuses. As can be seen in Figure 42, fuses 1, 2, 3 and 4 are located on the MSV
board, fuses 5 and 6 on the I/O board and the fuses 7, 8, 9 and 10 are located on the
wiring backplane under the MSV board.
5. Finally re-install the covers for the electronics and mechanical section in the reverse
order.
WARNING:
The mains cord must be disconnected before exchanging the fuses.