24
Unidrive Regen Installation Guide
www.controltechniques.com
Issue Number: 2
The rate at which the DC bus voltage can be reduced by the drive depends on the headroom between the bus voltage and the supply voltage. If
quasi-square mode is selected this headroom can be effectively increased at some points within a supply cycle. This can give better performance,
particularly when the supply voltage is high or the bus voltage set-point is low.
When the drive is enabled it must detect the phase and frequency of the mains. During this period this bit is set. Once synchronisation has been
completed successfully this bit is cleared. If the supply is very severely distorted or a phase is missing the drive will repeatedly attempt to synchronise
until it is disabled or synchronisation is completed.
When the drive has been enabled and successfully synchronised this bit will be set to 1. If the drive is disabled, the unit trips or detects that the mains
is lost, this bit will be set to 0.
If a supply phase is not present the sinusoidal rectifier unit will not synchronise when it is enabled. However, if a phase is lost after synchronisation
one of the following will occur:
•
Lightly loaded: the unit will continue to operate normally.
•
Medium load: the unit will continue to operate, but the phase loss bit is set.
•
Heavy load: the unit will detect mains loss, disable itself and attempt to re-synchronise.
When the Regen drive has powered up through the soft start resistor and the DC bus voltage stabilised this bit will change from 0 to 1. This bit must
be routed to a digital output terminal which is used to energise the soft start contactor coil.
When the close contactor output goes active the soft-start contactor should operate and short out the soft-start resistor. This bit should be set as the
destination parameter for a digital input connected to an auxiliary contact on the soft start contactor. If this input becomes inactive when bit Pr 15.14 is
set then after a 100ms (approx.) delay the drive will inhibit so as to protect the soft-start circuit.
When the unit has been enabled and successfully synchronised this bit will be set to 1. If the Regen drive is disabled, the unit trips or detects that the
mains is lost, this bit will set to 0.
This bit should be routed to a digital output and used to enable the motoring drive(s) connected to the DC bus of the Regen drive.
15.10
0.20
Quasi-square operation select
ô
0 ~ 1
ð
0
RW
Bit
15.11
0.21
Sinusoidal rectifier synchronising
ô
0 ~ 1
ð
RO
Bit
15.12
0.22
Sinusoidal rectifier synchronised
ô
0 ~ 1
ð
RO
Bit
15.13
0.23
Sinusoidal rectifier phase loss
ô
0 ~ 1
ð
RO
Bit
15.14
0.24
Close soft start contactor
ô
0 ~ 1
ð
RO
Bit
15.15
0.25
Soft start contactor is closed
ô
0 ~ 1
ð
RO
Bit
15.16
0.26
Enable motor drive
ô
0 ~ 1
ð
RO
Bit
