-92--91-
SHUTDOWNS RELATED TO INLET VALVE FAILURE
Follow this procedure if a 50 to 450 HP Intellisys machine shutsdown because
the inlet valve failed to open after Star Delta transition.
1. Program the controller to look at inlet filter condition (i.e., psi vacuum)
during operation. Serviceman's Guide, Page 55.
(Normal operation)
2. At start-up, the inlet will close completely causing a high inlet vacuum
(14 psi vacuum) or higher. At Star-Delta transition, the inlet valve
should open slightly causing the vacuum to decrease and allowing the
sump pressure to rise.
3. If the inlet valve does not open after Star-Delta transition, the machine
will shut-down on:
a. High Inlet Vacuum - Eprom 1.4 and lower (see trouble shooting
procedure)
b. Low Unloaded Sump Pressure - Eprom 1.5 and higher (see trouble
shooting procedure)
c. Check Inlet Control System - If a load mode is selected at transition,
and the open stepper limit switch is not activated. (See trouble
shooting procedure)
Note:
a, b, & c are normally caused by electrical circuit problems. Verify
that all electrical circuits and components are operating properly.
4. If the valve does not open at Star-Delta transition, the problem is
normally cause by the inability of the stepper motor to overcome
resistance in the inlet valve. High inlet vacuum or a worn inlet valve
shaft and plate assembly can mechanically bind and prevent the valve
from opening against initial vacuum. Also, the valve shafts and plate
assembly could be corroded or rusted in some manner.
5. The 6" Inlet Valve can be modified to reduce the torque required to open
the valve. This is accomplished by drilling a 7/16" hole through the open
side of the valve plate. See figure A for the location of the hole.
7/16" HOLE
W/BEVEL
FIGURE A
All future production SSR compressors that use the 6" butterfly valve will use the
valve with the 7/16" hole in the plate (P/N 39816798).
For field service needs, ordering the valve without the hole (P/N 39805577) will
cross reference to the valve with the hole (P/N 39816798). Ordering the inlet
valve kit including the valve wihtout the hole (P/N 39679253) will cross reference
to the kit including the valve with the hole (P/N 39685656). Therefore, any
replacement valves ordered will have the hole.
SSR 50-450 HP
STARTER INTERFACE BOARD VOLTAGE CHART
SSR Voltage Chart
Starter Interface Printed Circuit Board
BTS-1
TERMINAL #'S VOLTAGE CONDITION
1,2 24 VAC POWER ON
1,2 0 VAC POWER OFF
36,3 115 VAC POWER ON
36,3 0 VAC POWER OFF
32,3 115 VAC HATS CLOSED
32,3 0 VAC HATS OPEN
30,3 115 VAC CLOSED
30,3 0 VAC OPEN
34,3 115 VAC ESTOP CLOSED
34,3 0 VAC ESTOP OPEN
28,27 115 VAC DURING START UP AND RUNNING
28,27 0 VAC UNIT STOPPED
26,25 115 VAC AFTER STARTER TRANSITION
26,25 0 VAC UNIT STOPPED AND PRIOR TO STARTER TRANS
24,23 115 VAC UNIT STARTED AND BEFORE TRANSITION
24,23 0 VAC UNIT STOPPED AND AFTER STARTER TRANSITION
20,19 115 VAC UNIT RUNNING LOADED
20,19 0 VAC UNIT STOPPED AND UNIT RUNNING UNLOADED
18,17 115 VAC UNIT RUNNING
18,17 0 VAC UNIT STOPPED
16,15 115 VAC UNIT RUNNING *REMOTE COOLER SOLENOID MUST
16,15 0 VAC UNIT STOPPED BE INSTALLED TO MEASURE
INDICATED VOLATE
BTS-2
TERMINAL #'S VOLTAGE CONDITION
15,14 +5VDC CONTACT OPEN
15,14 0VDC CONTACT CLOSED
13,12 +5VDC BOTH CONTACT OPEN
13,12 0VDC EITHER CONTACT CLOSED
11,10 +5VDC CONTACT OPEN
11,10 0VDC CONTACT CLOSED
9,8 +5VDC CONTACT OPEN
9,8 0VDC CONTACT CLOSED
7,6 +5VDC CONTACT OPEN
7,6 0VDC CONTACT CLOSED
5,4 +5VDC CONTACT OPEN
5,4 0VDC CONTACT CLOSED
3,2,1 DRY CONTACTS RATED TO 240 VAC
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