48
Operation
2.
Slide Valve Control Gear Motors
Capacity and volume ratio control of the
screw compressor is achieved by movement
of the respective slide valves, actuated by
electric motors.
NOTE:
The manual operating shaft on the gear motor
should be turned the
opposite
direction of the
desired command shaft rotation.
The older capacity and volume control mo-
tors are equipped with a brake. If it is neces-
sary to operate the control motors manually,
the brake must be disengaged. The brake
can be disengaged by pushing on the motor
shaft on the cone end. The shaft should be
centered
in its travel. Do not use excessive
force manually operating the motor or dam-
age may result.
Table 1
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
VSR 111 CW CCW
CW
CCW 0.91 / 328 / 3.568"
0.52 / 187 / 2.045"
VSR 151 CW CCW
CW
CCW 0.91 / 328 / 3.568"
0.52 / 187 / 2.045"
VSR 221 CW CCW
CW
CCW 0.91 / 328 / 3.568"
0.52 / 187 / 2.045"
VSR 301 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 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 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
"
Note:These refer to the old stlye gear motors and DO NOT apply to the optical motors.
turns the compressor unit off, the slide valve mo-
tors will immediately energize to drive the slide
valves back to 5% limit. The control motors will
be de-energized when the respective slide valve
moves back below 5%. If there is a power failure,
the compressor unit will stop. If the manual start
on power failure option is selected (see appropri-
ate Microprocessor Instruction Manual), restart-
ing from this condition is accomplished by push-
ing the reset button to insure positive operator
control. If the auto start on power failure option
is selected (see appropriate Microprocessor In-
struction Manual), the compressor unit will start
up after a waiting period. With both options, the
compressor slide valves must return below their
respective 5% limits before the compressor unit
can be restarted.
Summary of Contents for VSM 71-701
Page 1: ...1 VPN 35391S February 2006 Rev 05 Price 60 00...
Page 2: ...2...
Page 20: ...20...
Page 52: ...53 Pre Start Up Check List...
Page 99: ...99 Recommended Spare Parts List...
Page 104: ...104 Gate Rotor...
Page 110: ...110 Main Rotor VSS...
Page 112: ...112 Main Rotor VSR...
Page 114: ...114 Slide Valve Cross Shafts and End Plate...
Page 118: ...118 Capacity Slide Volume Slide Carriage Assembly Slide Valve Carriage Assembly...
Page 134: ...134 Miscellaneous Frame Components VSS Screw Compressor VSR Mini Screw Compressor...
Page 138: ...138 C FlangeAdapter Components 630 620 610 640 601 641 630 601 620 610 640 641 642 650 651...
Page 140: ...140 Replacement Parts Tools...
Page 144: ...144 GaterotorAssembly...
Page 148: ...148 Main Rotor Slide Valve Cross Shafts and End Plate Models 71 401 Only Counter clockwise...
Page 152: ...152 Main Rotor Slide Valve Cross Shafts and End Plate Model 501 701 Only Clockwise...
Page 154: ...154 Volume Ratio Capacity Slide Carriage Assembly Slide Valve Carriage Assembly...
Page 158: ...158 Miscellaneous Frame Components Model VSM 501 701 Model VSM 71 401...
Page 160: ...160 Replacement Parts Accessories Housing Accessories C Flange Assembly...
Page 166: ...166 Haight Pumps...
Page 170: ...3 Refrigerating Specialties Division...
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Page 237: ......
Page 238: ......
Page 243: ......
Page 244: ...168...