Monitor Program Data and Controls
26
Danfoss Turbocor Compressors Inc.
ECD-00007M Rev. 1
6.3.1 Compressor Control Modes
Calibration
In Calibration mode, the compressor prepares itself for
calibration. Any external demand will be blocked from the
system, i.e., any external computer, PLC, building
management system, or automatic control will
not
be able
to control the compressor.
In Calibration mode, the user may only calibrate the
bearings. Refer to section 6.2 "Bearing Calibration" on page
20.
NOTE:
The compressor must be de-levitated, and the Chiller
Interface interlock circuit must be open for the compressor
to be calibrated.
Manual Control
In Manual Control mode, the user:
• Must set the “Loading Demand (% max power)”
parameter from the “Compressor Control” window.
Refer to 6.3 "Compressor Control".
• Must set the “Inlet Guide Vane” (% opening) from
the “Compressor Control” window. Refer to 6.3
"Compressor Control".
• Must set the “Desired Shaft Speed (RPM)”
parameter from the “Magnet Motor Monitoring”
window. Refer to section 6.4 "Motor Monitoring" on
page 28.
• May calibrate the bearings. Refer to section 6.2
"Bearing Calibration" on page 20.
Use Manual Control mode when servicing or
troubleshooting the compressor.
Total Compression Ratio
Ratio of the absolute discharge pressure and the absolute suction
pressure.
Estimated Minimum Speed
Estimated minimum RPM the compressor can run at with a fully open
inlet guide vane.
Maximum Speed
Maximum RPM the compressor can run at for a given set of inlet and
outlet conditions.
Compressor Display Units Button
Changes the measurement unit used when button is pressed.
The options are:
• Metric Units - kPa, ºC, ºK
• Imperial Units - Psi, ºF, ºR
System Messages
Describes the state of the system.
Start-up Settings
- Suction Press Start Limit (% Trip)
Temporary alarm and trip limit for the suction pressure. The limit is set
up as a % of the current suction pressure limit, e.g. if a suction
pressure trip of 270 kPa was set and the suction pressure start limit
was set to 50%, the temporary suction pressure trip limit would be 135
kPa. This temporary limit is only active while the Suction press start
fault delay is timing down.
Start-up Settings
- Suction Start Press Fault delay
Time in seconds that the temporary suction pressure alarm / fault limit
should be enabled.
Start-up Settings
- Suction Pressure Delay
(Count down)
Current count down in seconds. The timer starts to count down once
the shaft starts to rotate.
Table 6 Compressor Controller Parameters (Continued)
Parameter
Description
