Danfoss VLT CDS 303 User Manual

NOTICE!
The DC-brake Function is not operational before any
Start Function has completed. In case of an emergency
stop before the starting sequence has completed then
the compressor may rotate reverse for a short moment
after stop. Under normal circumstances, the Short Cycle
Protection feature ensures the correct sequence.
28-40 Reverse Protection Control
Option: Function:
Activate a DC-brake current when the motor is
stopped. The current level is dened in
parameter 28-41 DC Brake Current. Not
recommended for Piston compressors.
[0] * Disabled
[1] Enabled
28-41 DC Brake Current
Range: Function:
90% * [0 – max motor
current ]
Set the DC-brake current as percentage
of the rated motor current in
parameter 1-24 Motor Current.
28-42 DC Braking Time
Range: Function:
2.0 s* [0 – 60.0 s] Set the duration of the DC-brake current.
28-43 DC Brake Cut-in Speed [RPM]
Range: Function:
700 RPM
‘0’ = O*
[0 – max
motor speed]
Set the speed where the DC-brake
Current should cut in. The speed
must be higher than 0 RPM for the
DC-brake to activate before the
motor is coasted at 0 RPM to prevent
a reverse rotation.
6.15.6 28-5* Load Prole
The Load Proler is used to get a graphical presentation of
the load pattern a cooling system has been subjected to
over the last 6 months. The system load is assumed to be
proportional to the compressor speed, and the Load
Proler measures the load as the running hours spent
operating within certain speed intervals.
The speed intervals are calculated based on
parameter 4-11 Motor Speed Low Limit [RPM]
(parameter 4-13 Motor Speed High Limit [RPM]) and
parameter 4-13 Motor Speed High Limit [RPM]
(parameter 4-14 Motor Speed High Limit [Hz]) to match 0%,
25%, 50%, 75% and 100% loads as good as possible. The
speed intervals are denoted “O”, “Low”, “Med.”, “High” and
“Full” and are calculated in the following manner:
Δ = MotorSpeedHighLimit − MotorSpeed LowLimit
O: Speed = 0
Low:
MotorSpeedLowLimit ≤ Speed
 < MotorSpeedLowLimit + Δ/6
Med.MotorSpeed
LowLimit + Δ/6 ≤ Speed < MotorSpeedLowLimit + Δ/2
High:
MotorSpeed
LowLimit + Δ/2 ≤ Speed < MotorSpeedLowLimit + 5 × Δ /6
Full:
MotorSpeed
LowLimit + 5 × Δ/6 ≤ Speed ≤ MotorSpeedHighLimit
For example, if 4-11 Motor Speed High Limit is 5400 RPM
and Motor Speed Low Limit is 1800 RPM the four calculated
intervals become
Low: 1800 RPM ≤ speed < 2350 RPM
Med: 2350 RPM ≤ speed < 3450 RPM
High: 3450 RPM ≤ speed < 4550 RPM
Full: 4550 RPM ≤ speed ≤ 5400 RPM
The
prole is presented on the LCP as a histogram. In each
speed interval, the indicated running time is accurate to
within 1 hour.
Figure 6.39 Load Prole
If [O] is pressed on the LCP, the Load Prole is not
updated.
28-50 Reset Load Prole
Option: Function:
[0] * Do not reset No function
[1] Reset Clears the measured running time in all ve
speed intervals.
Parameter Descriptions Operating Instructions
MG34M422 Danfoss A/S © Rev. 2013-07-03 All rights reserved. 125
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Danfoss VLT CDS 303 Specifications

General

Brand	Danfoss
Model	VLT CDS 303
Category	DC Drives
Language	English