Essential Health & Safety Requirements | 25
4. Instrument grounding is mandatory. Performance specifications and
safety features are void if the unit is operated from an improperly
grounded source. Check ground integrity to all portions of the analyz-
er before power up. See Fig. 3-3 for proper internal grounding instruc-
tions.
Do not power up AC source(s) at this time.
CIRCUIT GROUND
TERMINAL RING
RING TONGUE
GROUND STUD
SOLE PURPOSE
(TOOTH IF ON PAINT)
LOCKWASHER
NUT
MAIN GROUND
INCOMING
CHASSIS
CIRCUIT GROUND
FAN MOUNTING STUD
NUT
FAN FRAME
MAIN GROUND
INCOMING
CHASSIS
MAIN GROUND
INCOMING
TERMINAL RING
RING TONGUE
(TOOTH IF ON PAINT)
LOCKWASHER
NUT
GROUND STUD
SOLE PURPOSE
Circuit ground cannot be removed for servicing fan without disturbing
incoimg main ground. No lockwasher. Stud not sole purpose.
Improper Multiple Ground on Single Screw
Circuit ground can be removed for servicing independently of
incoimg main ground. No lockwasher. Stud not sole purpose.
Proper Multiple Ground on Single Screw
Proper Single Ground Screw
Figure 4.
Proper and improper protective
ground connections.
!
WARNING