Emerson unidrive m200 - Braking Resistor Thermal Time Constant; External Trip; Drive Reset; Number of Auto-Reset Attempts

A thermal protection system is provided for the braking resistor. If BrakingResistorRatedPower (10.030) is set to zero this protection system is disabled and the
BrakingResistorThermalAccumulator (10.039) is held at zero. If braking resistor thermal protection is required the BrakingResistorRatedPower
(10.030), BrakingResistorThermalTimeConstant (10.031) and BrakingResistorResistance (10.061) should be set up with the braking resistor parameters. The
thermal time constant of the resistor can be calculated from the single pulse energy rating (E in Joules) and continuous power rating (P in Watts) of the resistor.
BrakingResistorThermalTimeConstant (10.031) = τ = E / P
The braking resistor is protected with a single time constant model as shown below.
The drive monitors the power flowing into the braking resistor and updates the BrakingResistorThermalAccumulator (10.039). If bit 1 of ActionOnTripDetection
(10.037) = 0 and the accumulator reaches 100% an BrakeRTooHot trip is initiated. If bit 1 of ActionOnTripDetection (10.037) = 1 and the accumulator reaches
100% the braking IGBT is disabled until the accumulator falls below 95.0%.
Parameter 10.031 Braking Resistor Thermal Time Constant
Short description Set to the thermal time constant of the braking resistor
Mode Open‑loop
Minimum 0.00 Maximum 1500.00
Default 0.00 Units s
Type 32 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 2
Coding RW
See BrakingResistorRatedPower (10.030) .
Parameter 10.032 External Trip
Short description Set to initiate an external trip
Mode Open‑loop
Minimum 0 Maximum 1
Default 0 Units
Type 1 Bit Volatile Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, NC
If ExternalTrip (10.032) is set to one an ExternalTrip.003 is initiated. A digital input can be routed to ExternalTrip (10.032) to provide an external trip input function.
Parameter 10.033 Drive Reset
Short description Set to initiate a drive reset
Mode Open‑loop
Minimum 0 Maximum 1
Default 0 Units
Type 1 Bit Volatile Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, NC
A 0 to 1 transition in DriveReset (10.033) causes a drive reset. If a drive reset terminal is required a digital input should be routed to DriveReset (10.033).
Parameter 10.034 Number Of Auto-reset Attempts
Short description Set to the number of required auto-reset attempts
Mode Open‑loop
Minimum 0 Maximum 6
Default 0 Units
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, TE
Value Text
0 None
1 1
2 2
3 3
4 4
5 5
6 inF
If NumberOfAuto-resetAttempts (10.034) = 0 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 after a delay defined by Auto-resetDelay (10.035) subject to the minimum reset time allowed for the type of trip. Note that for some
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Unidrive M200 Parameter Reference Guide
Issue: 01.05.00.10