User manual

Service Monitor User Manual
Danfoss Turbocor Compressors Inc. 9
ECD-00007M Rev. 1
2. Enter the Temporary Suction Pressure Delay Time.
This parameter represents time in seconds that the
temporary suction pressure alarm / fault limit should be
enabled. The timer starts to count down once the shaft
starts to rotate.
3. Enter the Compressor Starting Speed. If the estimated
surge speed is greater than the starting speed setting,
the compressor will ramp up to the surge speed. If the
starting speed setting is greater than the estimated surge
speed, the compressor will ramp up to the starting
speed. In both cases, the compressor speed will
increase at the full ramp rate.
4. Enter the Run Contact Close RPM. The compressor
contains a NO relay contact that closes while the
compressor is running. The speed at which the contact
closes is determined by the Run Contact Close RPM.
5. Enter the Inlet Guide Vane Starting % Open. Typically,
the vanes will be set to the closed or almost closed
position at start-up.This is to minimize the possibility
of liquid flood back and to reduce the compressor’s
start-up current draw.
6. Click Next to continue.
4.1.2 Electronics Valve Control
(Refer to Figure 9)
This section explains how to set up the expansion valves for
various applications. Both valves can be operated
independently or in parallel.
For Expansion Valve #1:
1. Enter the number of steps to drive the valve from fully
closed to fully open. Expansion valves with different
numbers of steps can be used.
If the incorrect number of steps is selected, the valves
may not have enough travel to allow the required
amount of mass flow or the valve may not be able to
throttle down to the required amount of mass flow.
This situation could cause liquid flood back and
damage to the compressor.
2. Select the control mode for the expansion valve.
Available options are: superheat, liquid level, or load
balance. See Table 3 for a description of the modes.
3. Enter the Starting Valve Position. If desired, at
compressor start-up, the valves can be set to open to a
pre-start value for a given time. This value represents
the percentage of maximum steps sent to the motor
upon start-up of the compressor. The stepper motor will
hold at this position until the stepper start delay timer
has expired.
4. Enter the Valve Starting Position Delay Time. The
delay is the amount of time (from compressor start-up)
Figure 8 Start-up Settings
Figure 9 Electronics Valve Control Setup