Emerson Mentor MP Advanced User's Manual page 83

Parameter Keypad and
structure display
Enable field control
5.77
Bit SP
Coding
Range 0 to 2 (FLd OFF, IntrnL and EtrnL)
0
Default
Mains period / 6 ms
Update rate
This parameter should be set as follows
0 - the internal and external field controllers are disabled.
1 - the internal field controller is enabled. When the internal field controller is enabled then it will control Pr 5.56, Pr 5.57 and Pr 5.58.
2 - the external field controller is enabled. When the external field controller is enabled then it will control Pr 5.54 and Pr 5.56. If no signal is received
from the external field controller the drive will trip field loss.
Full control enable
5.78
Bit SP
Coding
1
Range 0 to 1
0
Default
Background read
Update rate
Provides the option for a fully controlled bridge when using the external field controller.
Economy active
5.79
Bit SP
Coding
1
Range
0 to 1
0
Default
Background read
Update rate
When this bit is set the economy timeout feature is selected.
Economy level select
5.80
Bit SP
Coding
1
Range 0 to 1
0
Default
Background read
Update rate
5.81 Field thermal time constant
Bit SP
Coding
0.0 to 3000.0
Range
41.0
Default
21.30
Second motor
parameter
Background read
Update rate
The motor is modelled thermally in a way that is equivalent to the electrical circuit shown below.
τ = RC
2 2
I /(1.05*Field Rated Current)
The temperature of the field as a percentage of maximum temperature, with a constant current magnitude of I and constant value of field rated current
(set by Pr 5.70 or Pr 21.24) after time t is given by
2
Temp = [I / (1.05*Field rated current)
Mentor MP Advanced User Guide
Issue Number: 1
Parameter description
Parameter x.00
format
FI DE Txt VM DP ND
1
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
C
R Temp
2 -t/τ
] (1 - e ) x 100%
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Advanced parameter
descriptions
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Serial comms
Performance
protocol
PS
1
PS
PS
1
PS
PS
1
Menu 5
83