CG Drives & Automation 01-7492-01r1 Functional description 97
PWM Mode [22E2]
PWM Random [22E3]
Udc filter [22E4]
Activating the Udc filter makes the drive less responsive to
fast Udc changes. This can be useful to improve system
stability when connected to a weak power grid but may
reduce the dynamics of motor control.
Encoder Pulse counter [22F]
Only visible if the encoder option is installed. Shows the
number of accumulated quadrature encoder pulses (QEP).
It can be used as a position counter for hoisting and
traveling motors. The counter value is held by a signed
32-bit register. It counts up in positive rotation direction
and down in negative rotation direction. It can be preset, via
communication, to any value within the bus format used
(Int = 16 bits, Long = 32 bits).
Encoder fault and speed monitoring
[22G]
Parameters for encoder fault monitoring and speed
supervision by use of the encoder feedback for detecting
speed deviation compared to internal speed reference signal.
Similar speed deviation functionality is also available in the
Crane option, with parameters for speed bandwidth and
delay time.
Encoder fault trip conditions:
1. No encoder board detected after power up and AC
drive is setup to use encoder.
2. Lost communication to encoder board for more
than 2 seconds.
3. If no pulses detected for set delay time [22G1] and
drive in Torque Limit (TL) or Current Limit (CL).
Encoder speed deviation trip condition:
Encoder speed outside set speed deviation band [22G2] for
set delay time [
22G1].
22E2 PWM Mode
Default: Standard
Standard 0 Standard
Sine Filt 1
Sine Filter mode for use with output Sine
Filters
NOTE: Switching frequency is fixed when “Sine Filt”
is selected. This means that it is not possible to
control the switching frequency based on
temperature.
22E3 PWM Random
Default: Off
Off 0 Random modulation is Off.
On 1
Random modulation is active. Random
frequency variation range is ± 1/8 of level
set in [E22E1].
22E4 Udc filter
Default: Off
Off 0 The Udc filter is not active.
On 1 The Udc filter is active.
22F Enc Puls Ctr
Default: 0
Resolution 1
Note: For a 1024 pulse encoder [22F] will count
1024 * 4= 4096 pulses per turn.
Note: If encoder signals are missing or encoder cable
disconnected, the measured speed will then be 0 rpm
and the AC drive will run with Torque Limit (TL) at very
low speed.
Note: Other likely scenarios when encoder signals are
lost during operation are tripped drive due to
“Overcurrent Fast” or “Desat”.
Note: Encoder speed deviation trip re-uses
“Deviation 2” trip message with ID = 2.
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