Firing Pulse - Siemens SINAMICS DCM Operating Instructions Manual

Connecting
6.16 Connector assignment (terminals, Faston mounting tabs, ribbon cables)
6.16.8

Firing pulse

Time sequence
The time sequence for firing pulses is set via parameter p51826:
p51826[0]
p51826[1]
p51826[2]
Notes
● If p51826[0] = 105 or p51826[1] = 105: Block pulse (without pulse chopping)
● If p51826[0] ≤ p51826[1] is set, p51826[0] will be ignored and the first pulse will have the
same length as all the other pulses.
● p50079 is used for short pulse/long pulse selection.
p50079 = 0
p50079 = 1
Figure 6-45
The pulse shape of the current depends on the length of the cable to the thyristor
(cathode/gate). Cable inductance causes the rising edge of the current pulse to become
slower as the cable length increases.
148
Length of first pulse (factory setting = 50 µs)
Length of other pulses (factory setting = 35 µs)
Length of pause (factory setting = 70 µs)
Short pulses, pulse length 890 µs
Long pulses, pulse duration up to approx. 0.1 ms before the next pulse
Firing pulse - time sequence
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A