05TA Service Manual
OPTIONS AND ACCESSORIES
8/13/01
10-3
Automatic Restart.
05TA machines are equipped with a power failure relay. This relay prevents the
machine from automatically restarting in the event of a power failure. The machine should have
power on the crankcase heater for a minimum of two hours before it is restarted with the start switch.
The PLC allows the user to select between having to restart the machine manually or restarting
automatically, two hours after power is restored.
Timed Freeze Cycle.
The normal mode of operation for the length of the freeze cycle is determined
by the freezer pressure switch setting. The freezer pressure switch will automatically compensate for
variations in water temperature and operating conditions to provide consistent ice thickness. The
PLC allows the length of the freeze cycle to be a fixed time. The freeze time will have to be adjusted
as water temperature and operating conditions change, however this method of control can prove
helpful when sequencing two or more machines to avoid simultaneous harvest cycles.
Blowdown Adjustment.
Normal operation is for blowdown to occur during the entire harvest cycle.
The PLC allows the user to adjust the amount of blowdown by setting the length of time that
blowdown will occur. The time can be set from zero (no blow-down) to five minutes.
Diagnostic Indicators.
The PLC provides text messages in the event of a malfunction or fault. The
PLC will alert the user in the event of the following conditions.
•
high or low pressure
•
short cycling (three consecutive freeze cycles five minutes or less in duration)
•
long cycle (a freeze cycle lasting more than 60 minutes)
•
water pump overload
•
cutter motor overload
•
compressor overload
•
loss of oil pressure
•
power failure
Cutter Delay.
PLC equipped machines delay start of the cutter motor for eight seconds after the
water pump has stopped. This allows water to drain from the freezer and cutter assembly before the
cutter assembly starts turning, thereby reducing the amount of water that can be splashed out the ice
discharge opening.
Alarm Relay.
The PLC equipped machines have an alarm output relay that can be used to initiate
external alarms such as a siren, light, telephone dialer or modem (see FIGURE 10-4).
Conveyor Control Contacts.
Control contacts are provided for starting and stopping conveyors in
sequence with the ice machine. Normally the contacts are closed during the entire harvest cycle and
open during the freeze cycle. In many cases it is necessary to run the conveyors for a period of time
longer than the harvest cycle to allow the conveyor to finish delivering the ice. The PLC allows the
user to set the duration of the conveyor run cycle independently of the harvest cycle. The user can
also set a delay between the start of the harvest cycle and the conveyor start.
Estimated Ice Production.
The PLC allows the user to enter the weight per cycle of ice being
produced. This weight will depend on how the machine has been set up to run and the size of the
Summary of Contents for TUBE-ICE 05TA
Page 4: ...Vogt Tube Ice Machines Installation Service Manual and Parts Catalog 12A4171M06 05TA Model ...
Page 82: ...05TA Service Manual SERVICE OPERATIONS 8 13 01 9 18 FIGURE 9 10 Cutter Drive Parts ...
Page 95: ...05TA Service Manual OPTIONS AND ACCESSORIES 8 13 01 10 11 FIGURE 10 3 Control Panel Parts ...
Page 97: ...05TA Service Manual OPTIONS AND ACCESSORIES 8 13 01 10 13 FIGURE 10 4 Wiring Schematic ...
Page 103: ...05TA Service Manual TABLES CHARTS 8 14 01 11 1 11 Tables Charts ...
