Getting Started; Regen Parameter Settings; Switching Frequency Pr 5.18 (Pr 0.41); Dc Bus Voltage Set Point - Emerson SP1201 Installation Manual

Safety Product
Introduction
Information information
7

Getting started

7.1

Regen parameter settings

7.1.1

Switching frequency Pr 5.18 (Pr 0.41)

Set the switching frequency on the Regen drive to the required value
(3kHz default value).
A higher switching frequency setting has the following advantages:
• Line current ripple at the switching frequency is reduced, giving
improved waveform quality.
• Acoustic noise produced by the line inductors is reduced.
• Dynamic DC bus voltage response is improved.
N
NOTE
In some cases, setting the switching frequency to a value greater than
the default 3kHz results in current derating. Refer to Chapter 12
Technical Data in the Unidrive SP User Guide.
7.1.2

DC bus voltage set point

The table below defines the DC Bus voltage set point levels, assuming a
tolerance of ±10% on the given supply voltage. The minimum value is
defined as the peak input voltage plus some headroom. Headroom is
required by the drive to allow correct control of the current. It is advisable
to set the voltage below the maximum value to give more allowance for
transient voltage overshoots.
Table 7-1 DC bus voltage set point - Pr 3.05 (Pr 0.01)
Voltage levels DC Bus voltage set-point
Supply voltage Default
Vac Vdc
200 350
400 700
575 835
690 1005
The DC bus voltage set point, see Pr 3.05 (Pr 0.01), should be set to a
level that is suitable for the AC supply voltage being used. It is very
important that the Regen drive DC bus voltage set point Pr 3.05
(Pr 0.01) is set above the peak AC supply voltage by at least 50Vac.
7.2

Regen drive sequencing

When a Regen drive is enabled, it goes through a line synchronisation
sequence. During this procedure, test pulses are applied to the incoming
line to determine the voltage and phase. When it has been successfully
synchronised to the line, the DC bus voltage controller is enabled and
the DC bus voltage rises to the target voltage.
Only when all of these stages have been completed successfully is the
motoring drive enabled. If at any time there is a fault, or the Regen drive
is disabled, the motoring drive will also be disabled.
This sequence of events is important to prevent damage to the Regen
drive, motoring drive or external power circuit components.
The sequence of events is as follows:
86
System Mechanical Electrical
design installation installation
Recommended
Vdc
350
700
835
1005
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Getting
Optimisation Parameters
started
Power applied and power removed 400V system
Single Regen: Single Motoring
1 2 3 4
1. K1 (main supply contactor / isolator) is closed with charging circuit
active (K3 closed).
2. DC bus charges through the Regen drives Vac inputs L1, L2, L3
(charging circuit)
3. If the DC Bus > 430Vdc then K2 Regen drive main contactor and
Aux.2 are closed via Regen drives relay, control terminals 41, 42.
4. K3 charging contactor is opened via K2 (Regen drive main
contactor) and Aux.1 closes. The Regen drive enable, S1 can now
be applied
5. The Regen drive and motoring drives can be enabled (enable signal
from Regen drive to motoring drives active, control terminal 24)
6. K1 (main supply contactor / isolator) is opened removing power from
the regen system.
7. DC bus discharges to 410Vdc at which point drive the healthy relay
becomes in-active. The Regen drives enable is removed. The
motoring drives enable signal from Regen drive becomes in-active
8. Regen drive main contactor, K2 is opened via the drive healthy relay,
control terminals 41, 42. Aux.2 opens informing the drive that the
Regen drives main contactor K2 is open.
9. K3 charging contactor is closed and Aux.1 opens
Power applied and power removed 400V system
Single Regen: Multiple Motoring (Unidrive SPMC)
1 2 3 4
1. K1 (main supply contactor / isolator) is closed with charging circuit
active (K3 closed).
2. DC bus charges through Unidrive SPMC (charging circuit).
3. If the DC Bus > 430Vdc then K2 Regen drive main contactor and
Aux.2 are closed via Regen drives relay, control terminals 41, 42.
4. K3 charging contactor is opened via K2 (Regen drive main
contactor), SPMC 24Vdc is removed Aux.2A and Aux.1 closes. The
Regen drive enable, S1 can now be applied.
5. The Regen drive and motoring drives can be enabled (enable signal
from Regen drive to motoring drives active, control terminal 24).
6. K1 (main supply contactor / isolator) is opened removing power from
the regen system.
Technical Component
data sizing
K1
K3
Vdc
Drive Healthy
K2
Aux.2
Aux.1
Aux.3
S1
5 6 7 8 9
K1
K3
Vdc
Drive Healthy
K2
Aux.2
Aux.2A
Aux.1
Aux.3
S1
5 6 7 8 9
Unidrive SP Regen Installation Guide
Issue Number: 2
Diagnostics