Nidec Unidrive M600 Series - Page 140

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140 Unidrive M Regen Design Guide
Issue Number: 4
4. K3 charging contactor is opened via K2 (Regen drive main
contactor), as Aux.2b opens and Aux.3 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 / disconnect) is opened
removing power from the Regen system.
7. DC bus discharges to the UV threshold at which point the drive OK
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 OK relay,
control terminals 41, 42.
9. Aux.2a opens informing the drive that the Regen drives main
contactor K2 is open. K3 charging contactor is closed and Aux.3
opens.
Power applied and power removed 400 V system
(refer to Figure 4-6 on page 46)
Figure 7-3 Single Regen: Multiple Motoring - external softstart
resistor
1. K1 (main supply contactor / isolator) is closed with charging circuit
active (K3 closed).
2. DC bus charges through the external charging resistors
(charging circuit).
3. If the DC Bus > 430 Vdc 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 410 Vdc 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 400 V system
(refer to Figure 4-8 on page 52)
Figure 7-4 Regen brake resistor replacement
1. K1 (main supply contactor / isolator / disconnect) is closed.
2. DC bus charges through motoring drives L1, L2, L3 Vac inputs.
3. If the DC Bus > the UV threshold then K2 Regen drive main
contactor and Aux.2 are closed via Regen drives relay, control
terminals 41, 42.
4. 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 / disconnect) is opened
removing power from the Regen system.
7. DC bus discharges to the UV threshold at which point the drive OK
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 OK relay,
control terminals 41, 42. Aux.2 opens informing the drive that the
Regen drives main contactor K2 is open.
N
When the Regen drive has powered-up and the DC bus voltage has
exceeded the UV threshold, Pr 03.007 changes from 0 to 1 activating
the drives relay which in turn closes the Regen drive main contactor
(charging circuit disconnected using contactor / relay logic). If either the
DC bus voltage falls below the UV threshold or the system is
synchronized and the AC voltage falls below Regen Supply AC Level
(Pr 03.023), Pr 03.007 will change from a 1 to 0 opening the Regen drive
main contactor (charging circuit re-connected using contactor / relay
logic).
Synchronization:
• Apply test pulses to line to determine magnitude and phase.
• Attempt to synchronize to the line.
• If synchronization is successful then enable the DC bus voltage
controller.
DC bus voltage controller active:
• DC bus voltage rises to reference level.
• Motoring drive enabled by digital output from Regen drive.
Motoring drive active:
• The motor may now be energized and rotated.
• Power flows to and from the line as necessary via the Regen drive.
• DC bus voltage remains stable.
·
Whilst running if:
• The line voltage dips too low:
The Regen drive synchronizes to the Vac supply and therefore
knows the supply voltage (Pr 05.002).
• OR the DC bus voltage goes out of regulation:
DC bus drops below the UV threshold.
• OR there is any trip on the Regen drive:
Drive OK no longer active. Regen and motoring drive(s) enable
removed.
K1
K3
Vdc
Drive Healthy
K2
Aux.1
Aux.2
Aux.3
1 234 5 6 78
S1
9
K1
Vdc
Drive OK
K2
Aux.2
Aux.1
1 234 5 6 78
S1
NOTE