Control Techniques Digitax ST Advanced User's Manual page 25

Parameter Keypad and
structure display
1.07 Minimum reference clamp
Bit SP
Coding
Range ±SPEED_LIMIT_MAX rpm*
Default 0.0
Second motor
Pr 21.02
parameter
Update rate Background read
*The range shown for Pr 1.07 shows the range used for scaling purposes (i.e. for routing to an analog output etc.). Further range restrictions are
applied as given below.
Pr 1.08
(Neg min ref enable) (Bipolar mode enable)
0
0
1
1
The same limits are applied to Pr 21.02, but based on the value of Pr 21.01.
(If the second motor map is selected Pr 21.01 is used instead of Pr 1.06 and Pr 21.02 instead of Pr 1.07)
1.08 Negative minimum reference clamp enable
Bit SP
Coding
1
Default 0
Update rate Background read
The effects of the reference clamps (Pr 1.06 and 1.07), the negative minimum clamp enable (Pr 1.08) and the bipolar reference enable parameters
are defined below.
The variable maximum limit for reference parameters, SPEED_FREQ_MAX, is defined as:
If Pr 1.08 = 0: SPEED_FREQ_MAX = Pr 1.06
If Pr 1.08=1: SPEED_FREQ_MAX is Pr 1.06 or -Pr 1.07 whichever is the largest
(If the second motor map is selected Pr 21.01 is used instead of Pr 1.06 and Pr 21.02 instead of Pr 1.07)
Digitax ST Advanced User Guide
Issue Number: 1
Parameter
Parameter x.00
description format
FI DE Txt VM DP ND
1 1
Pr 1.10
0
1
0 -SPEED_LIMIT_MAX to 0 rpm
1 -SPEED_LIMIT_MAX to 0 rpm
FI DE Txt VM DP ND
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Advanced parameter Serial comms
descriptions protocol
RA NC NV PT US RW BU
1 1 1
Range
0 to Pr 1.06
0
RA NC NV PT US RW BU
1 1
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Performance
nameplate
PS
PS
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25