Protection Of Stack Control And Feedback Wiring; Thyristor Trigger Output Options; Trigger Board Output Option - Parker 598P Applications Manual

PROTECTION OF STACK CONTROL AND FEEDBACK WIRING

Suitable fuse protection should be installed against faults in the armature voltage feedback wiring, against faults
in the line voltage sensing and against faults in the thyristor trigger firing circuits/wiring. These fuses should be
located at the external stack end of the wiring.
Fuses applied to the thyristor firing wires should be two-up (i.e. in each of the Gate and Cathode wires), and
should make use of twisted pair wiring either side of the fusing. The fuse current rating used for the thyristor
firing wires should be appropriate for the size of wires used, and yet rated at not less than 2A rms. The fuse
voltage rating should be appropriate for the external stack system voltage.

THYRISTOR TRIGGER OUTPUT OPTIONS

There are two options available to provide the triggering of the external stack thyristors:

1. Trigger Board Output Option

Trigger Board output option (product codes with 'TP' starting code block 3)
This option makes use of direct driven pulse transformers, locally mounted in the external stack
controller. It provides isolated drive signals that can be wired directly to the external stack thyristor
gate terminals (via appropriate fusing, see earlier).
There are two voltage ratings of this output option available:
500Vac rms (product codes with '23' or '53' starting code block 2)
690Vac rms (product codes with '73' starting code block 2)
The two voltage ratings of this output option have differing drive capabilities, and they are described
by the following typical drive parameters (onto a 2.5V load) and steady-state Voltage-Current
characteristics:
Initial Current Step
Initial Current Rise Time
Delay to Steady-State Current
Trigger Pulse Width
598P/599P Application Manual
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500Vac rms Option 690Vac rms Option
0.55A
0.3µs
3µs
175µs
3 of 20
0.35A
0.3µs
6µs
425us