User's Manual

50
The Motor Amps Load Limit protects the com-
pressor from overloading by decreasing the
compressor capacity if the motor amperage is
at the Maximum Amps setpoint, or preventing
an increase in capacity if the motor amperage is
above the Full Load Amps setpoint. ( See manual
for the appropriate microprocessor.)
3. Oil Separator Heater
The oil separator heater keeps the oil in the
separator from becoming too viscous and helps
keep gas from condensing in the receiver section
of the separator.
The heater is turned on only when the compres-
sor is off. The separator heater is supplied with
an integral temperature control.
Operation
B. Safety Setpoints
A detailed explanation of all safety setpoints can be
found in the Compact Logix PLC manual, p/n 35391CL.
1. Oil Pressure
Low oil pressure differential stops the compressor
unit when there is an insufficient difference in pres-
sure between the oil manifold and suction.
2. Discharge Pressure
High discharge pressure cutout stops the compres-
sor unit, when the discharge pressure in the oil
separator exceeds the setpoint.
NOTE: These refer to the old style gear motors and DO NOT apply to the new optical motors.Rotation for the
optical motors is the OPPOSITE of what is shown in the chart.
TABLE 1. VSS / VSR / VSM COMMAND SHAFT ROTATION AND TRAVEL
COMMAND SHAFT ROTATION NO. OF TURNS / ROTATION ANGLE / SLIDE TRAVEL
COMP. CAPACITY VOLUME CAPACITY VOLUME
MODEL INC DEC INC DEC TURNS/ANGLE/TRAVEL TURNS/ANGLE/TRAVEL
VSS 291 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”
VSS 341 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”
VSS 451 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”
VSS 601 CW CCW CW CCW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”
VSS 751 CCW CW CCW CW 1.09 / 392 / 4.283” 0.63 / 227 / 2.473”
VSS 901 CCW CW CCW CW 1.09 / 392 / 4.283” 0.63 / 227 / 2.473”
VSS 791 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”
VSS 891 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”
VSS 1051 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”
VSS 1201 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”
VSS 1301 CCW CW CCW CW 1.22 / 439 / 4.777” 0.74 / 266 / 2.889”
VSS 1501 CCW CW CCW CW 1.36 / 490 / 5.325” 0.82 / 295 / 3.200”
VSS 1801 CCW CW CCW CW 1.36 / 490 / 5.325” 0.82 / 295 / 3.200”
VSM 71 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 91 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 101 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 151 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 181 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 201 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 301 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 361 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 401 CW CCW CW CCW 0.80 / 288 / 3.141” 0.45 / 162 / 1.767”
VSM 501 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”
VSM 601 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”
VSM 701 CCW CW CCW CW 0.91 / 328 / 3.568” 0.52 / 187 / 2.045”