Replacing Fuses - YOKOGAWA ZR22G User Manual

11.2.1

Replacing Fuses

The converter incorporates a fuse, as indicated in Figure 11.5. If the fuse blows out, replace it in
the following procedure.
CAUTION
• If a replaced fuse blows out immediately, there may be a problem in the circuit.
Go over the circuit completely to find out why the fuse has blown.
• This fuse is for protecting the main power supply circuit and does not provide overcurrent
protection for the heater temperature control circuit. For overcurrent protection circuitry, refer
to Section 12.1.2.2, Heater Temperature Failure.
Figure 11.6
To replace the fuse, follow these steps:
(1) Turn off the power to the converter for safe replacement.
(2) Remove the fuse from its holder. With the appropriate flat-blade screwdriver that just fits the
holder cap slot (Figure 11.6), turn the fuse holder cap 90° counterclockwise.
By doing so, you can remove the fuse together with the cap.
(3) Check the rating of the fuse and that it satisfies the following:
Maximum rated voltage: 250 V
Maximum rated current: 3.15 A
Type: Time-lag fuse
Standards: UL-, CSA- or VDE-approved
Part number: A1113EF
Place a new, properly rated fuse in the holder together with the cap, and push and turn the
cap clockwise 90° with the screwdriver to complete installation of the fuse.
Flat-blade
screwdriver
Figure 11.7
Location of Fuse in the Converter
Cap
Removing the Fuse
<11. Inspection and Maintenance>
Fuse
Socket
Fuse
F11.6E.ai
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
11-9