Operation and Maintenance Warnings:
- Never touch a live power terminal. This could cause a shock or machine malfunction.
- Due to the danger of an electric shock, confirm that the GLC’s power cord is un-
plugged before either cleaning the GLC or attaching/detaching the power terminal
screws.
- When replacing the GLC’s backlight, be sure to unplug the unit’s power cord to
prevent a shock, and wear gloves to prevent being burned.
- The GLC uses a lithium battery for backing up its internal clock and control memory
data. If the battery is incorrectly replaced (i.e. the + and - sides are reversed), the
battery may explode. Therefore, before changing the battery, Digital recommends
that you contact your local GLC distributor for battery replacement instructions.
- Do not attempt to modify the GLC’s internal parts or wiring in any way, since this
may lead to either a shock or fire.
CAUTIONS
Wiring Layout Cautions:
Be sure that all GLC input/output signal lines are isolated from all power wiring or
power cables, via a separate wiring duct. This is to prevent excessive noise, which can
cause a unit malfunction.
Installation Cautions:
- When attaching the I/O unit to the GLC, be sure that all the I/O unit’s attachment
screws are used and the unit is securely attached to the GLC. If the I/O unit is not
attached securely in place, the I/O unit may be damaged if it falls off the back of the
GLC, or a system-related malfunction or accident may occur due to I/O data signal
problems.
- Be sure any data cable attached to the GLC’s connector is securely attached. If the
cable and connector pins do not all make complete contact, incorrect input or output
signals can result.
General Wiring Cautions
- To prevent shocks or malfunctions, GLC’s FG (earth) wire should be grounded ac-
cording to the following:
1) A maximum grounding resistance of 100 W or less.
2) A grounding wire of 2mm
2
or larger should be used.
- The GLC’s wiring should be checked to confirm both that the operating voltage and
wiring terminal locations are correct. If either the voltage or the wiring terminal loca-
tions are incorrect, it can cause a fire or accident.
- Be sure to secure all wiring terminal screws in place with the designated torque.
Screws and terminals that become loose can cause a short circuit, fire or accident.
- Be sure that metal filings or wiring remnants do not fall inside the GLC, since they
can cause a fire, accident, or malfunction.
GLC Operation and Maintenance Cautions
- Be sure to read the GLC’s manual and on-line help information carefully before per-
forming program changes, forced output, or utilizing the RUN, STOP or PAUSE
commands while the GLC is in operation. Mistakes concerning the use of these items
can cause a machine accident or damage.
GLC Unit Disposal Cautions
- The GLC unit should be disposed of in a manner appropriate to the user country’s
industrial machinery disposal standards.
