Yaskawa MP920 Motion Module - Manual (Page 320)

7 PO-01 Module Specification and Handling
7.2.1 Motion Control Functions
7-18
„ Maximum Pulse Output Frequency
The reference pulse output from the PO-01 Module is determined by the high-speed scan
time set on the CPU Module and by the maximum pulse output frequency set at motion
fixed parameters.
0 ≤ |reference pulse (kpps)| ≤ |{Max Hz (10 kHz) × 10 × Ts (ms) − 2} /Ts (ms)|
• Max Hz: Fixed parameter No. 38: Maximum Pulse Output Frequency (Units: 10 kHz)
• Ts: High-speed scan time for the CPU Module (Units: ms)
Maximum Reference Pulse Example 1
Ts = 1 (1.0 ms), maximum pulse output frequency = 10 (100 kHz):
Maximum reference pulse = (10 × 10 × 1.0-2) / 1.0 = 98.0 (kpps)
Maximum Reference Pulse Example 2
Ts = 2 (2.0 ms), maximum pulse output frequency = 20 (200 kHz):
Maximum reference pulse = (20 × 10 × 2.0-2) / 2.0 = 199.0 (kpps)
If the feed speed (reference pulse) is set higher than the maximum reference pulse shown
above, then an overspeed alarm (IB††227 = ON) will be generated and the machine will
stop.
1. The pulse output frequency is the same for all four axes. Set the same value for all axes whether
they are used or not.
When different values are set, then the maximum pulse output frequency setting for the smallest
axis number being used will be used for all four axes, as shown in the following example.
In the above case, the 10 kHz setting for Axis 2 will be used for all four axes. If Axis 1 is changed
so that it is also used, then the setting for all four axes will be the 100 kHz setting for Axis 1. If
Axis 1 is not used and Axis 2 is changed so that it is also not used, then the setting for all four axes
will be the 20 kHz setting for Axis 3.
2. Set an integer using 200 ÷ maximum pulse output frequency (1 = 10 Hz) for the maximum pulse
output frequency setting. In other words, set 1, 2, 4, 5, 8, 10, 20, 25, 40 or 50 for the maximum
pulse output frequency setting.
Applicable Axis Maximum Frequency
Axis 1 Axis not used 100 kHz
Axis 2 Axis used 10 kHz
Axis 3 Axis used 20 kHz
Axis 4 Axis not used 40 kHz
IMPORTANT