Safety - Danfoss VLT Refrigeration Drive FC 103 Programming Manual

Introduction
1 1
+
VVC
If compared with standard voltage/frequency ratio control,
voltage vector control (VVC
the stability, both when the speed reference is changed
and in relation to the load torque.
60° AVM
60° asynchronous vector modulation
(parameter 14-00 Switching Pattern).
Power factor
The power factor is the relation between I
3 x U x I
Power factor =
3 x U x I
The power factor for 3-phase control:
I1 x cosϕ1
Power factor =
I
The power factor indicates to which extent the frequency
converter imposes a load on the mains supply.
The lower the power factor, the higher the I
same kW performance.
2 2 2
I = I + I + I
RMS 1 5 7
In addition, a high-power factor indicates that the different
harmonic currents are low.
The DC coils in the frequency converters produce a high-
power factor, which minimizes the imposed load on the
mains supply.
Target position
The final target position specified by positioning
commands. The profile generator uses this position to
calculate the speed profile.
Commanded position
The actual position reference calculated by the profile
generator. The frequency converter uses the commanded
position as setpoint for position PI.
Actual position
The actual position from an encoder, or a value that the
motor control calculates in open loop. The frequency
converter uses the actual position as feedback for position
PI.
Position error
Position error is the difference between the actual position
and the commanded position. The position error is the
input for the position PI controller.
Position unit
The physical unit for position values.
8
+
) improves the dynamics and
1
cosϕ
1
RMS
I
1
= since cosϕ1 = 1
I
RMS RMS
2
+ .. + I
n
Danfoss A/S © 05/2016 All rights reserved.
®
VLT Refrigeration Drive FC 103

1.2 Safety

WARNING
DISCHARGE TIME
The frequency converter contains DC-link capacitors,
which can remain charged even when the frequency
converter is not powered. High voltage can be present
even when the warning indicator lights are off. Failure to
wait the specified time after power has been removed
before performing service or repair work, could result in
and I .
RMS
death or serious injury.
1.
2.
for the
3.
RMS
Voltage [V]
200–240
380–500
525–600
525–690
Voltage
[V]
380–500
525–690
Table 1.4 Discharge Time
Safety regulations
•
Stop the motor.
Disconnect AC mains, permanent magnet type
motors, and remote DC-link power supplies,
including battery back-ups, UPS, and DC-link
connections to other frequency converters.
Wait for the capacitors to discharge fully, before
performing any service or repair work. The
duration of waiting time is specified in Table 1.4.
Minimum waiting time (minutes)
4 7
0.25–3.7 kW –
(0.34–5 hp)
0.25–7.5 kW –
(0.34–10 hp)
0.75–7.5 kW –
(1–10 hp)
– 1.5–7.5 kW
(2–10 hp)
Power
90–250 kW
(125–350 hp)
315–800 kW
(450–1075 hp)
55–315 kW (frame size D)
(75–450 hp)
355–1200 kW
(475–1600 hp)
Disconnect mains supply to the frequency
converter whenever repair work is to be carried
out. Check that the mains supply has been
disconnected and that the necessary time has
elapsed before removing motor and mains supply
15
5.5–37 kW
(7.5–50 hp)
11–75 kW
(15–100 hp)
11–75 kW
(15–100 hp)
11–75 kW
(15–100 hp)
Minimum waiting
time (minutes)
20
40
20
30
MG16H202