SPX Waukesha Cherry-Burrell Votator II, Operation And Maintenance Manual

Page: 36 / 84

Operation Waukesha Cherry-Burrell
Page 36 95-03057 October 2005
Refrigeration Sequence of Operation - PLC Control Panel
Liquid Overfeed System
1. Prior to start up, the Flow Control valves should be set
for the process tonnage.
2. The Refrigerant System Mode switch is placed in the
"ON" position.
3. When the system is ready to be started up, product
flow has been established, and the mutator shaft is
running, the Votator II Refrigeration push button is
pushed to turn Refrigeration "ON". This opens the
Liquid Feed Solenoid valve and the Low Pressure
EPR valve. The Hot Gas valves and the Purge valves
remain closed. The product temperature of the system
can now be controlled by the PID local SP setting.
4. In the event of high motor amperage as a result of
over-cooling, the freeze protection circuitry will, at a
preset amperage, close the Low Pressure EPR valve.
If the motor amperage decreases, this valve will return
to the "OPEN" position. If the motor amperage
increases to an overload condition, the mutator drive
stops, the Liquid Feed Solenoid valve and the Low
Pressure EPR valve close. Hot Gas can be applied to
thaw the system using Step 5 below.
5. Placing the Refrigerant System Mode switch in the
"OFF" position closes the Liquid Feed valve. The
operator can now "OPEN" the Hot Gas Inlet valve
and the Purge valve. Hot Gas should remain on until
the system thaws and the mutator shaft is free to
rotate.
6. After a defrost cycle, close the Hot Gas Inlet valve
and the Purge valve and the system must be restarted
following normal start up procedures.
7. When shutting the system down, the Votator II
Refrigeration and the Refrigerant System Mode
switches should be placed in "OFF" and product or
flush flow should be maintained until warm up.
8. Turn Votator II mutator drives "OFF".
Gravity Systems
1. The Refrigerant System Mode switch is placed in the
"ON" position. This places the system in a standby
mode by opening the flow of liquid refrigerant to the
accumulator and allowing the level control to
function.
2. When the system is ready to be started up, product
flow has been established, and the mutator shaft is
running, the Votator II Refrigeration push button is
pushed to turn Refrigeration "ON". This opens the
Refrigerant Return valve on Horizontal units and the
Low Pressure EPR valve so the refrigerant back
pressure can be controlled, thereby controlling the
product temperature. The product temperature of the
system can now be controlled by the PID local SP
setting.
3. In the event of high motor amperage as a result of
over-cooling, the freeze protection circuitry will, at a
preset amperage, close the Low Pressure EPR valve
and the Refrigerant Return valve on Horizontal units.
If the motor amperage decreases, these valves will
return to the "OPEN" position. If the motor amperage
increases to an overload condition the mutator drive
stops. Hot Gas should be applied to thaw the system
using Step 4 below.
4. Placing the Refrigeration switch in the "OFF"
position closes the Liquid Feed valve. The operator
can now "OPEN" the Hot Gas Inlet valve. Hot Gas
should remain on until the system thaws and the
mutator shaft is free to rotate.
5. After a defrost cycle, close the Hot Gas Inlet valve
and the system must be restarted following normal
start up procedures.
6. When shutting the system down, the Votator II
Refrigeration and the Refrigerant System Mode
switches should be placed in the "OFF" position and
product or flush flow should be maintained until
warm up.
7. Turn Votator II drives "OFF".