Function Application
‑592‑
3.4.13Encoder Signal Processing
The PG card of the AC drive supports programmable filtering of encoder signals.
Para. No. Function Default
Value Range Description
F1‑29
PG signal filter
1 0 to 3
This parameter is used to set the filter mode.
● 0: Non‑adaptive filter
The filter coefficient of the PG card is fixed and small. This filter mode is applicable
to scenarios with low or no interference, or high‑speed applications.
● 1: Adaptive filter
The filter coefficient of the PG card can be adjusted automatically. This filter mode
has a strong interference‑resistant capability, especially when the encoder
feedback frequency is lower than 100 kHz. This mode is suitable for scenarios with
high interference. This mode is enabled by default.
● 2: Fixed interlock
This mode adds the capability to eliminate encoder feedback signal edge jitter on
the basis of adaptive filter. It is applicable to scenarios where encoder feedback
signals have jitter at the edge.
● 3: Automatic interlock
The PG card automatically switches between adaptive filter and fixed interlock to
adapt to zero‑speed running and non‑zero‑speed running. This mode prevents the
fixed interlock function from mistakenly recognizing and eliminating valid signals
as edge jitter during zero‑speed running.
Table 3–28 Encoder disconnection detection
Para. No. Function Default
Value Range Description
F1‑36
PG open circuit detection
0
0: Disabled
1: Enabled
‑
The PG card of the MD500‑PLUS series AC drive supports encoder disconnection
detection. This function is valid only for encoders with differential interfaces, and can
be used to detect signals of phase A, phase B, and phase Z. If the PG card is
connected only to phase A and phase B, the AC drive reports E20.00. In this case,
disable encoder disconnection detection. Otherwise, the AC drive keeps reporting this
error.
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