Control Techniques unidrive sp User Manual

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Menu 10
Unidrive SP Advanced User Guide 177
Issue Number: 7 www.controltechniques.com
Therefore P
av
= E / Tp
Therefore full power braking period (Pr 10.31), Tp = E / P
av
The resistance and the braking resistor R, the total energy E and the average power P
av
can normally be obtained for the resistor and used to
calculate Pr 10.30 and Pr 10.31.
The temperature of the resistor is monitored by the braking energy accumulator (Pr 10.39). When this parameter reaches 100% the drive will trip if
Pr 10.37 is 0 or 1, or will disable the braking IGBT until the accumulator falls below 95% if Pr 10.37 is 2 or 3. The second option is intended for
applications with parallel connected DC buses where there are several braking resistors, each of which cannot withstand full DC bus voltage
continuously. The braking load will probably not be shared equally between the resistors because of voltage measurement tolerances within the
individual drives. However, once a resistor reaches its maximum temperature its load will be reduced, and be taken up by another resistor.
If this flag is set to one then the drive will trip (Et). If an external trip function is required, a digital input should be programmed to control this bit.
A zero to one change in this parameter will cause a drive reset. If a drive reset terminal is required on the drive the required terminal must be
programmed to control this bit.
If Pr 10.34 is set to zero then no auto reset attempts are made. Any other value will cause the drive to automatically reset following a trip for the
number of times programmed. Pr 10.35 defines the time between the trip and the auto reset (this time is always at least 10s for OI.AC, OI.br trips,
etc.). The reset count is only incremented when the trip is the same as the previous trip, otherwise it is reset to 0. When the reset count reaches the
programmed value, any further trip of the same value will not cause an auto-reset. If there has been no trip for 5 minutes then the reset count is
cleared. Auto reset will not occur on a UU, Et, EEF or HFxx trips. When a manual reset occurs the auto reset counter is reset to zero.
10.32 External trip
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default
Open-loop, Closed-loop vector, Servo,
Regen
0
Update rate Background read
10.33 Drive reset
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default
Open-loop, Closed-loop vector, Servo,
Regen
0
Update rate Background read
10.34 No. of auto-reset attempts
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range
Open-loop, Closed-loop vector, Servo,
Regen
0 to 5
Default
Open-loop, Closed-loop vector, Servo,
Regen
0
Update rate Background read
10.35 Auto-reset delay
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range
Open-loop, Closed-loop vector, Servo,
Regen
0.0 to 25.0 s
Default
Open-loop, Closed-loop vector, Servo,
Regen
1.0
Update rate Background read
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Control Techniques unidrive sp Specifications

General

Brand	Control Techniques
Model	unidrive sp
Category	Controller
Language	English