Carrier TRANSICOLD Vector 8700 - Cargo Protect Mode; Engine Speed Overrides; High Voltage

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4.10.2 Cargo Protect Mode
The control system will activate Cargo Protect mode when the 00122 Check Return Air Sensor and 00123 Check
Supply Air Sensor alarms activate at the same time.
• If the setpoint is in the perishable range (refer to Section 4.6.1), the unit will shutdown.
• If the setpoint is in the Frozen Range the engine will go to low speed.
The MessageCenter will display “WARNING: NO TEMPERATURE CONTROL” when the unit is operating in Cargo
Protect mode.
4.10.3 Engine Speed Overrides
This section lists the different factors that determine engine speed (high or low) in addition to the speed controls
used in temperature control.
Speed Control Overrides in priority order are:
1. High Voltage
If the 20 second average voltage is greater than 585V or the instantaneous voltage is greater than 595V,
force low speed for 10 minutes.
2. RAT and SAT Alarms
When the A00122 - “CHECK RETURN AIR SENSOR” and A00123 - “CHECK SUPPLY AIR SENSOR”
alarms are both active at the same time the control system will enter Cargo Protect mode. Refer to Sec-
tion 4.10.2.
3. Engine Coolant Warm-Up
The engine will run in low speed until the coolant is above 79°F (26°C).
4. Door/Remote Switch Configuration
If the DOOR/REMOTE SWITCH Configuration is set for low speed, the engine will run in low speed when
the door/remote switch is open/active.
5. Automatic Silent Mode
If in diesel start/stop mode and engine restarts for any reason except S/S Perish Override Temp or S/S
Frozen Override Temp (refer to Table 3–2), Diesel Engine mode is forced to low speed for the minimum
OFF time. If any time during the override the unit is no longer in Diesel start/stop mode, disable the over-
ride until the next restart. This Override does NOT apply for the first start of the engine.
6. Adjustable High Speed Delay
Whenever the engine starts, the unit will remain in low speed according to the Continuous or Start-Stop
High Speed Delay Functional Parameter setting.
7 High Speed Delay
Whenever the engine is in low speed, transition to high speed will be delayed for the HIGH SPEED DELAY
Configuration setting.
8 Start-Stop Frozen Range
When in Start-Stop Operation with a setpoint in the frozen range after the minimum run time has expired,
the engine will be forced to high speed if the refrigerated compartment temperature is not yet down to set-
point.
9. Frozen Setpoint Override
If the setpoint is in the frozen range and the temperature is below setpoint, the engine will operate in low
speed.