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MELSEC-Q
3 SPECIFICATIONS
(c) Precautions on configuring a redundant power supply
1) If either of the power supply modules fails and it needs to be replaced
in a remote I/O station including redundant power supply, replace the
other power supply module as well, in order to prevent the potential
accidents
Also, it is recommended to replace power supply modules five years
after the remote I/O station starts to run.
For procedures for replacing a redundant power supply module in a
normal operating state, refer to Section 8.5.
2) For the Q64RP power supply modules for the redundant power supply
system, it is recommended to supply AC power from one of them and
to supply power from the other via UPS (Uninterruptible Power
Supply).
Use the on-line UPS or line interactive UPS, of which voltage distortion
is less than 5%. Or use the off-line UPS, Mitsubishi FREQUPS-F
Series with serial No. P or later. (Example: FW-F10-0.3K/0.5K).
Do not use the off-line UPS other than above.
3) When mounting modules onto the Q38RB or Q68RB redundant power
supply base unit, make sure that the sum of 5VDC current
consumption of them is within 8.5 A, the rated current value of a power
supply module.
4) Connect a NF (non-fuse breaker) to each power supply module so that
power supply modules can be shut down separately when either of
power supply modules has failed.
5) The output of the ERR contact of the power supply module mounted
on a main or extension base unit is turned off when AC/DC power
supply is not input or a power supply module error is detected.
6) The output of the ERR contact of the power supply module mounted
on a main base unit is turned off when an error that stops the remote
I/O module has occurred.
REMARKS
For a remote I/O station including redundant power supply configuration, remote I/O
modules of function version C or later can also be used.
However, follow the precautions below.
(1) Precautions on redundant power supply
• When power supply fails, the remote I/O module does not detect an error
code. In addition, errors (minor errors) are not noticed to the remote master
station.
• When power supply fails, the remote I/O module does not store the error in
link special registers SW0088 to 8B.
(2) Precautions on the ERR contact of power supply module
• When an error that stops a remote I/O module operation occurs, the output
of the ERR contact is not turned off.
• When the remote I/O module is mounted on the main base unit, the output of
the ERR contact is always OFF.
When it is mounted on the extension base unit, the output is turned off in the
case where AC/DC power supply is not input or the ERR contact is turned off
due to detection of a power supply module error.