Graco Pressure Switches L15521 15521 Accessories User's Manual
Moisture-resistant single control pressure
switches
DESCRIPTION
Three factory set models are available for hydraulic pressures
from 10 to 4700 psi. All are single pole double throw type (NEMA
4). Each comes complete with a sealed 3-wire cable that is five
feet long.
OPERATION
When pressure exceeds the set point, the internal contacts
transfer (N.O. closes and N.C. opens). This can be used to send
an alarm signal to alert either a high, or low pressure condition.
When the abnormal condition is corrected, the contacts return to
their normal state.
ADJUSTMENT
The adjustment procedure for the high-pressure switch is as
follows:
Disconnect and lock out all power from the assembly before
•
attempting adjustment. Serious injury may result from
electrical shock.
To avoid possible system damage, change the blow out disc
•
or relief valve setting to match the new pressure switch
setting.
Turn off electrical power to the lube system.
a.
Connect switch to pressure source.
b.
With power disconnected, slide adjustment “cover”
c.
toward cable while twisting it to overcome friction.
Connect continuity tester (VOM or light) to leads.
d.
Insert screwdriver into adjustment slot and turn
e.
clockwise to increase setting or counter-clockwise to
decrease setting. For setting on rise, apply desired
pressure and turn adjustment (clockwise facing cable
end of pressure switch) until switch clicks and/or
tester confirms contact transfer (Circuit across N.O.
and COM. terminals closes). For setting on fall, apply
pressure equal to normal system operating pressure.
Reduce source pressure to set point value. Turn
adjustment counterclockwise until switch clicks and/
or tester confirms contact transfer (circuit across N.C.
and COM. closes).
After completing adjustments, slide “cover” closed
f.
over adjustment compartment. Recheck set point.
WARNING
Moisture
Resistant,
Adjustable
Pressure
Switches
FACTORY SEALED
3 WIRE CABLE 16 AWG 5 FT. LG.
1/4 NPT
1/2" FEMALE
CONNECTOR
CONDUIT
CAUTION
LABEL
PRESSURE
SWITC
H
542-210-12
0
1.06 (27)
HEX
4.25
(108)
ADJUSTMENT
COVER
RED
N.O.
BLACK N.C.
WHITE COM.
ORDERING INfORMATION
Max. Hydraulic
Pressure
Adjustment
Range, Rising
factory
Setting
Part No.
(Old Part No.)
2000
(138)
50 to 2000
(3 to 138)
50
(3)
557830
(542-210-200)
4700
(324)
400 to 4700
(28 to 324)
750
(52)
557828
(542-210-107)
4700
(324)
400 to 4700
(28 to 324)
1150
(79)
557829
(542-210-120)
Pressure Switches
SPECIfICATIONS
Ambient
Temperature Range
0º to 160ºF (-17º to 71ºC)
Max Media
Temperature
200ºF (93ºC)
Electrical Rating &
Approvals
Rated to 5A resistive and 5A inductive (75%
power factor), at 125 VAC & 250 VAC, 1/4 HP;
5A resistive and 3A inductive at 30 VDC; 0.5A
resistive & 0.25A inductive at 125 VDC; 5mA at
6 VDC, 2mA at 12 VDC & 1mA at 24 VDC
UL Recognized, CSA Certified
CE Compliance with low voltage directive (LDV)
CE Compliance to pressure equipment,
Directive (Ped/97/23/EC)
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