Haas+Sohn HRT 160 Operator's And Service Manual page 47

Parameter 27: Automatic Home Control, range 0 to 255 (0 to 512) PROTECTED!
All HAAS Indexers use a home switch used in conjunction with the Z pulse on the motor encoder (one for
each revolution of the motor) for repeatability. The home switch consists of a magnet (Haas PN 69-18101)
and proximity switch (Haas PN 36-3002), which is of the magnetically sensitive transistor type. When the
control is shut down and restarted, it will give a "no home" display, requiring the user to press the "zero
return" button. The motor then operates slowly in a clockwise direction (as viewed from the platter of a
rotary table) until the proximity switch is magnetically tripped and then backs up to the first Z pulse. (See
parameter code options in parameter section for actual options.) Note: to reverse direction when seeking a
home switch (if it currently moves away from the home switch during the home sequence), add 256 to the
value in parameter 27.
This parameter is used to customize the home control function of servo.
0: no automatic home functions available (no home switch)
1: only table zero position switch available
2: only Z channel home available
3: home on both Z channel and table zero switch
+4: home if inverted Z (determined by encoder used)
+8: home to zero position in negative direction
+16: home to zero position in positive direction
+24: home to zero position in shortest direction
+32: auto servo on at power on
+64: auto search for home at power on (have "auto servo on at power up" selected)
+128: for inverted HOME switch (determined by home switch used)
+256: search for home in positive direction (Brushless Only)
Parameter 28: Encoder Steps per Motor Revolution, 0 to 10000 (0 to 99999) PROTECTED!
This parameter is used with the Z channel option to check the encoder accuracy. If Parameter 27 is 2 or
3, this parameter is used to check that the correct number of encoder steps are received per revolution.
Only two numbers are used here:
Parameter 29: Back-EMF compensation, 0 to 999 (not used for brushless software) PROTECTED!
This parameter is used to control the adjustment of loop gain in response to motor generated back-EMF.
It is volts/Krpm times 10. Thus if the motor has 24.6 volts per KRPM this parameter is set to 246.
Parameter 30: Protection, 0 to 65535
This parameter is used to protect some of the other parameters. Every time the controller is turned on, this
parameter will have a new, random, value. If protection is selected (Parameter 24), the protected
parameters cannot be changed until this parameter is set to a different value that is a function of the initial
random value.
Parameter 31: CNC Relay Hold Time (0 to 9)
This parameter is used to specify the amount of time the CNC interface relay is held active at the end of
a step. If zero, the relay time is ¼ second. All other values give the time in multiples of 0.1 second.
Parameter 32: Delay Time for Engaging Brake, (0 to 19) PROTECTED!
This parameter is used to set to amount of time delay between the end of a motion and engaging the air
brake. It is in units of 1/10 seconds. A '4' will thus delay for 4/10 second.
Parameter 33: X-on/X-off Enable, (0 or 1)
This parameter is used to enable the sending of the X-on and X-off codes via the RS-232 interface. If your
computer needs these, this parameter should be set to 1. Otherwise, only the RTS and CTS lines can be
used to synchronize communication. (See section 2.3 on RS-232 Interface.)
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32768 for all brushless motors (8192 line encoder x quadrature)
8000 for all brush motors (2000 line encoder x quadrature)
96-5047 rev L June 2005