1-18 Product Overview
1560D-UM051D-EN-P – February 2005
Hardware Description (cont.) Self-Powered Silicon-Controlled Rectifier Gate Driver Board (cont.)
The MV Dialog Plus™ has three heatsinks fitted with a thermistor to
monitor SCR temperature rise. The circuitry on the gate driver board
accepts the thermistor, and drives a fibre-optic cable if the temperature is
below the setpoint (85°C). If the temperature rises above the setpoint, the
driver is turned off, and the MV Dialog Plus is signalled to stop gating and
initiate a temperature fault.
Due to the self-powered nature of the circuits, this function is active only
while the SMC is active. While the starter is off, or in bypass, no power is
dissipated in the SCRs and the temperature of the SCRs can only decrease.
Interface Board
This circuit board takes line- and load-side voltage feedback signals from
the voltage feedback board and passes them via pins to the MV Dialog
Plus™ for processing. The control module produces gating signals for the
SCRs, which are received via pins on the interface board, and used to drive
fibre-optic transmitters. The gating signals are sent to the gate-driver
circuit board via fibre-optic cables. The interface board also receives
temperature feedback from the gate-driver board via fibre-optic cable(s).
If the heatsink temperature rises above a set value, a signal is sent to the
Dialog Plus to stop gating the SCRs and initiate a temperature fault.
For a detailed description of this circuit board, refer to Figure 3.1 on
page 3-5.
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