50 
5-5-2. Analog value of rated speed 
 
Analog command input please refers to chapter 3-2-3. 
 
5-5-3. Speed command offset auto-adjustment (F1-03) 
When the servo is  in analog voltage speed mode, even if the command voltage is 0V, 
motor  will  run  at  very  low  speed.  The  micro-motion  will  happen  when  the  command 
voltage micro-offset  (mV)  of  host  controller  or  external  circuit occurs.  Auto-adjust the 
command offset by operate panel of servo. Refer to chapter 4-4-2. 
 
5-5-4. Proportion action command (/P-CON) 
1. /P-CON is the speed control mode signal selected from PI (proportion integral) and P (proportion). 
2. If set to P control mode, the motor rotate and micro-vibration caused by speed command input drift 
can be decreased. But the servo stiffness will decrease. 
3. /P-CON signal can be distributed to input terminal via parameter P5-11. Refer to chapter 5-12-1. 
 
 
5-5-5. Zero clamp (/ZCLAMP) 
(1) Function 
This  function  is  used  when  host  controller  uses  speed  command  input  and  the  servo 
system isn’t configured the position loop. In other words, the function will be used when 
the motor must stop and enter lock state even the V-REF input voltage is not zero. After 
the zero clamp function is ON, servo will configure the temporary position loop inside, 
motor will clamp in ±1 pulse. Motor will return to zero clamp position even the motor is 
rotating with external force. 
 
(2) Input signal setting 
 
(3) Parameter setting 
Analog value of rated speed 
Function: the speed command voltage (V-REF) to run the servo motor at rated speed. 
Such  as:  P3-00=500  means  the  motor  run  at  rated  speed  when  analog  input  voltage  =  5.00V       
P3-00=800 means the motor run at rated speed when analog input voltage = 8.00V. 
Note: /Z-CLAMP signal is distributed to input terminal by parameter P5-21, refer to chapter 5-12-1.