Ingersoll-Rand EP 20 SE, Operators/Instruction Manual Options, Page: 29 / 70

27
Modulate Control Valve Adjustment
Ensure the compressor is isolated from the
compressed air system by closing the isolation
valve and venting pressure from the drip leg.
Ensure the main power disconnect switch is
locked open and tagged.
1. Enter the setpoint routine and put the compressor
in the MODULATION mode. Refer to Section 3.5 for
instructions.
2. Remove 1/8" NPT plug from the tee in the control
piping on the side of the airend support. Connect a
pressure gauge to this port.
3. Loosen the adjustment screw locknut and back
out adjusting screw 3 turns. See Figure 4.7-2.
4. Open the isolation valve and start the compressor.
5. Adjust the isolation valve to bring the discharge
air pressure to the rated discharge pressure (125,
140, or 200 psig).
6. While MAINTAINING the rated discharge
pressure, turn the adjustment screw on the
modulation valve (see Figure 4.7-2) so that the test
pressure gauge reads:
22 psig for modulate 60% cfm (full voltage units)
16 psig for modulate 60% cfm (star-delta units)
20 psig for modulate 70% cfm (full voltage units)
18 psig for modulate 70% cfm (star-delta units)
Tighten the adjustment screw locknut.
7. Press UNLOADED STOP. Wait for sump pressure
to go 0 psig. Close the isolation valve or bleed off all
system air.
8. Enter the setpoint routine and put the compressor
in the desired control mode.
9. Remove the test pressure gauge and replace the
1/8" NPT plug using Loctite
®
PST or similar thread
sealant.
*Loctite is a registered trademark.
FIGURE 4.7-2 MODULATION VALVE
WARNING
!
Hazardous voltage. Can cause
severe injury or death.
Disconnect power before servicing.
Lockout/Tagout machine.
INGERSOLLrAND
®
WARNING
!
High pressure air.
Can cause severe injury or death.
Relieve pressure before removing filter
plugs / caps, fittings or covers.
INGERSOLLrAND
®
LOCKNUT
ADJUSTING SCREW