Overload Protection: Trouble Lights & Checking Shield Cup Shutdown System - Miller Spectrum 375 Owner's Manual

6-2. Overload Protection: Trouble Lights & Checking Shield Cup Shutdown System
4
Checking Torch Shield Cup Shutdown System
.
Power must be reset whenever the cup shutdown system is activated.
Always turn Off power when changing or checking consumables.
Do NOT overtighten torch shield cup. Gently finger tighten cup
onto torch.
Shield
Cup
OM-255 590 Page 24
.
A complete Parts List is available at www.MillerWelds.com
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2
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1 Power Light
Light is steady if input power is
okay. Light flashes for the following
conditions:
a If input power is 115 volts
AC, but power supply is
less than 92 volts AC or
greater than 138 volts AC.
b If input power is 230 volts
AC, but power supply is
less than 194 volts AC or
greater than 276 volts AC.
If certain problems occur a trouble
light comes on, and output stops.
2 Pressure Light
Lights if gas/air pressure is below
40 PSI (276 kPa).
Turn power Off, and check for
proper gas/air pressure (see
Section 5-1).
A flashing Pressure light indicates
that gas/air system may be set too
low, faulty, leaking or has a flow re-
striction (see Section 6-5).
3 Cup Light
Lights if shield cup is loose/off.
Turn Power On and loosen shield
cup. If shutdown system works
properly, Cup light comes on. If not,
turn power Off and have a factory
authorized service agent check
unit.
If system works properly, retighten
cup and reset power.
Turn power Off, and check shield
cup connection (see torch Owner's
Manual). Power must be reset
whenever the cup shutdown is
activated.
A flashing Cup light indicates that
the torch consumables are stuck or
worn and should be inspected and/
or replaced (see Section 6-4).
Check shield cup shutdown system
once a week.
4 Temperature Light
Lights if power source overheats or
when ambient temperature is below
−35° C (−31° F) (see Section 4-2).
Ref. 200 808 / Ref. 253 554-A