Control Techniques Digitax ST Advanced User's Manual page 141

Parameter Keypad and
structure display
Power from motor
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 bit
1 of Pr 10.37 is 0, or will disable the braking IGBT until the accumulator falls below 95% if bit 1 of Pr 10.37 is 1. The second option is intended for
applications with parallel connected DC bus 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.
10.32 External trip
Bit SP
Coding
1
Default 0
Update rate Background read
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.
10.33 Drive reset
Bit SP
Coding
1
Default 0
Update rate Background read
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.
10.34 No. of auto-reset attempts
Bit SP
Coding
Range 0 to 5
Default 0
Update rate Background read
10.35 Auto-reset delay
Bit SP
Coding
Range 0.0 to 25.0 s
Default 1.0
Update rate Background read
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. Note that this time could be a minimum of 10s for some
trips (see Pr 10.20 to Pr 10.29). 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 UV, Et, EEF, SLX.HF or HFxx trips. When a manual reset occurs the auto reset counter is
reset to zero.
10.36 Hold drive ok until last attempt
Bit SP
Coding
1
Default 0
Update rate Background read
If this parameter is 0 then Pr 10.01 (Drive ok) is cleared every time the drive trips regardless of any auto-reset that may occur. When this parameter is
set the 'Drive ok' indication is not cleared on a trip if an auto-reset is going to occur.
Digitax ST Advanced User Guide
Issue Number: 1
Parameter
Parameter x.00
description format
x (1-e ) -t/Tp
100%
Pav
FI DE Txt VM DP ND
FI DE Txt VM DP ND
FI DE Txt VM DP ND
FI DE Txt VM DP ND
1
FI DE Txt VM DP ND
www.controltechniques.com
Advanced parameter Serial comms
descriptions protocol
Braking energy overload
accumulator Pr 10.39
RA NC NV PT US RW BU
1
RA NC NV PT US RW BU
1
RA NC NV PT US RW BU
1
RA NC NV PT US RW BU
1
RA NC NV PT US RW BU
1
Electronic
Performance
nameplate
PS
1
PS
1
PS
1 1
PS
1 1
PS
1
Menu 10
141