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h.....INVERSE TIME
h.......AIMING POINT [116] = 105.00 %
h.......DELAY [117] = 60.0 SECS
h.......DOWN RATE [118] = 10.0 SECS
h.......UP RATE [148] = 120.0 SECS
........INVERSE TIME O/P [15 ] = 11.96 %
The inverse time function carries out two separate functions, a) Protects the stack against over heating by winding back
the current after a defined period. b) clamps the torque demand in the field weakening region to ensure that it does not
exceed the motor current limit.
At speeds greater than base speed the output of the inverse time will normally be less that 150 % due to the
Magnetisation current element of Motor Current.
Iq (Torque)
Id (Mag.
Current)
Motor Current
NOTE: The inverse time function is the only limit that works in motor current, all others work in Torque limit. Torque
limit takes no account the Magnetisation. Current.
150%
105%
I Dmd.
t Sec.
100%
Delay
(Aiming Point)
Ramp
Limit I
0
n+0
n+10
n+70
I Limit
Figure 5.7 Inverse Time
3$5$0(7(56
AIMING POINT
The level to which the inverse time function will wind back the current limit.
DELAY
The delay before the inverse time starts to operate.
DOWN RATE
The Rate at which the current is wound back
UP RATE
The rate at which the inverse time function recovers.
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......STOP RATES
........RUN STOP TIME [120] = 10.0 SECS
........RUN STOP LIMIT [121] = 60.0 SECS
........FAST STOP TIME [123] = 1.0 SECS
........FAST STOP LIMIT [124] = 60.0 SECS
........USE SYSTEM RAMP [125] = TRUE
f.......PRE-START DELAY [122] = 0.500 SECS
f.......READY DELAY [352] = 0.000 SECS
........CONTACTOR DELAY [112] = 0.5 SECS
........PILOT 590 MODE [777] = FALSE
........STOP ZERO SPEED [126] = 1.00 %
........PROG STOP I-LIM [622] = 150.00 %
........COAST STOP [26] = FALSE
........PROGRAM STOP [22] = FALSE
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