Moog MSD Servo Drive Series, Device Help

Page: 61 / 320


(2)ABDFN - A: Clock (falling edge), B: Direction (1 = positive) - PulseDir

(3)ABDRP - A: Clock (rising edge), B: Direction (1 = negative) - PulseDir_inv

(4)reserved
A maximum interpolation period, in ms (milliseconds), can be configured for the TTL
interface using P 601[0] - ENC_CH1_Period. Within this context, Period is the
maximum time of “no activity” since the last TTL counter event:

Period = 0: Function disabled (default)

Period > 0 (= n ms): If no counter event is registered in n ms, the speed will
be set to 0.
Zero pulse
There is no parameter for activating the zero pulse evaluation here, as this
evaluation is controlled exclusively based on the homing mode (see Section
"Homing" on page 18
9 ). However, setting P 541[0] - ENC_CH1_NpTest to 1
provides a test mode that can be used during commissioning in order to be able to
activate the zero pulse evaluation even without homing. Scope signals 1014 and
1016 can be used to view a received zero pulse within this context. This test mode
must be disabled during normal operation (P 541[0] = 0).
Commutation
Motor operation with pure incremental encoders needs for the auto commutation
function to be enabled without fail. For details see Section "Synchronous motor
auto commutation" on page 1
44 .
6.5.4.1.2 TTL incremental encoder with SSI absolute value
interface
See Section "Sin/Cos incremental encoder with absolute value interface" on
page 62 and in special Section "SSI absolute value interface" on page 64.
MOOG
ID No.: CB40859-001 Date: 02/2018
MSD Servo Drive - Device Help
61
6 Encoder
ID Index Name Unit Description
505 0 ENC_CH1_Sel = 3 Encoder selection set to TTL(3)
510 0 ENC_CH1_Num Encoder gearing: Numerator
511 0 ENC_CH1_Denom Encoder gearing: Denominator
540 0 ENC_CH1_Abs Selection of absolute value interface
541 0 ENC_CH1_NpTest ENC CH1, TEST-MODE: Index pulse signal(s) to Scope
542 0 ENC_CH1_lines Number of lines (Sin/Cos / TTL encoders)
558 0 ENC_CH1_TTL_SignalType Channel 1: TTL signal selection
601 0 ENC_CH1_Period Maximum period of interpolation (TTL encoder)
616 0 ENC_CH1_CycleCount Sampling cycle in: n x 125 μ (microseconds)
Table 6.8: Parameters for Channel 1 (X7) - TTL encoder