Eurotherm 590L Series, Product Manual, Page: 80 / 170

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The Minimum Speed Clamp is fully bi-directional and operates with a 0.5% hysteresis. This
clamp operates on the input to the ramp and it can therefore be overridden by the RESET
VALUE as far as the ramp output is concerned.
Input
Output
Minimum Speed
-0.5 0 0.5
Range: 0.00 to 100.00%
Default: 0.00%
Slot: 2257
LINK Value Range: 0.0 to 100.00%
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These parameters are not used in the 590L controller.
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Field Enable unquenches field current loop.
Range:
ENABLED/DISABLED
Default: ENABLED
Slot: 56
LINK Value Range: 1 / 0
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There are two field control modes:
(a) Field Voltage Control is an open loop phase angle control to give a certain voltage output.
(b) Field Current Control is a closed loop current control for accurate field control or expansion to
field weakening.
Range:
VOLTAGE OR CURRENT
Default: VOLTAGE CONTROL
Slot: 55
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This parameter controls the output voltage from the open loop voltage control. The ratio is
defined as the DC output voltage over the AC RMS input voltage.
Range:
0.00 to 100.00%
Default: 67.00%
Slot: 2115
LINK Value Range: 0.0 to 100.00%