Yokogawa AXFA14G/C - Manual (Page 99)

IM 01E20C02-01E 10-3
10. MAINTENANCE
10.2 Setting of Switches
IMPORTANT
• Removing and installing cover are necessary
for setting switches. Perform removing and
installing of the cover as described in section
10.1.2.1 and 10.1.2.3.
• To preserve the safety, do not touch the
electrical circuit and the cables except the
setting switches.
10.2.1 Setting of Burnout Switch
The burnout function sets the direction of current
output in situations where the CPU has become
damaged. Upon shipment from the manufacturing
plant, the burnout direction is set to High (i.e., 25 mA);
however, in cases where the optional code C1 has been
specified, the output direction will be set to Low
(i.e., 0 mA).
Modification of the burnout direction must be carried
out using the setting switch from the amplifier’s CPU
board (i.e., Switch 1) (See Figure 10.2.1).
Table 10.2.1 Output Setting Pins for Burnout
T1001.EPS
Position of
Pin
Burnout
Direction
Burnout
Output
Remarks
Low High
Low High
Low
High
0 mA
25 mA
Set to Low for optional
code C1
Set to High before
shipment
NOTE
• On the amplifier’s CPU board, the burnout
setting switch (i.e., Switch 1) and the write
protect switch (i.e., Switch 2) are located
adjacent to each other. Accordingly, special
care should be taken when making switch
settings.
• In the case of Fieldbus communication type,
burnout setting swich is not applied.
Switch 1
Low High
Switch 2
Enable Protect
F1007.EPS
2 Burnout setting switch
1 Write protect setting switch
Figure 10.2.1 Switch Configuration
10.2.2 Setting of Write Protect Switch
By setting the write protect function to “Protect” it is
possible to prevent the overwriting of parameters.
Write protection can be carried out using either the
hardware switch on the CPU board (i.e., Switch 2) or
software parameter settings. If either of these items is
set to “Protect,” the overwriting of parameters will be
prohibited.
NOTE
• If the hardware switch is set to “Protect,” it will
not be possible to overwrite parameters;
furthermore, this condition will be maintained
until the switch is set to “Enable.”
• In the case of Fieldbus communication type,
write protect setting switch is always be set as
“Enable”.
For more details regarding usage of the write protect
function and the software’s parameter switches, refer to
“Chapter 6: Parameter Description” in this user’s
manual.