1.
If not rack mounted, place one hand on the GridTime 3000 to ensure it doesn’t move
2.
Push in the cable’s ST connector and twist it counterclockwise to release the connector
3.
Gently slide the cable out of the port
6.6.2.6
HV MOSFET Port
This section describes how to connect to the GridTime 3000's HV MOSFET port.
The GridTime 3000 features a power MOSFET Switch port for the output of IRIG-B, DCF77, and user-defined pulse
TTL timing signals at custom amplitudes (HV MOSFET Port).
The port allows timing signals to be outputted at custom amplitudes up to ±250 V to suit end device input
requirements. If a 0-5V TTL signal is sufficient for your end device(s), the BNC port(s) should be used instead
of the HV MOSFET port.
An external DC supply that provides sufficent voltage for the end device input logic levels must be used with this port.
This can be the same supply used to power the GridTime 3000 if it is being DC powered.
The switching voltage and current ratings are provided in
.
Table 6-10. HV MOSFET Port Specifications
Ratings
Connector
Allows switching of 250 V at 100 mA maximum.
2-pin
Cable Recommendations
• Use a cable terminated with a 2-pin phoenix connector
• Ensure the cable is rated for the current expected to run through it
Tip:
To meet IEC 61850-3 standards, this port should be installed with a shielded cable. The shield
should be connected to earth at both ends.
Wiring Recommendations
• As the port is only a switch, an external power supply must provide the switching voltage. The port does not
provide its own voltage.
– conventional current flow must be into the “+” terminal and out of the “-” terminal. Incorrect polarity will
cause the output state to always be low.
• Use a circuit breaker with twice the rated current to protect the port and the connected end device.
Single End Device
• The end device should also be connected in series with the port, power supply, and circuit breaker.
• An inline resistor should also be included in series if the end device doesn't load the circuit with the current it
requires. Use R = V
required
/I
required
to determine its resistance.
Multiple End Devices
• The end devices should be multi-dropped into a bus. The device bus should be connected in series with the
port, power supply and circuit breaker.
• An inline resistor should also be included in series if the end devices don't load the circuit with the current they
require. Use R = V
required
/I
required
to determine its resistance.
Installation
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2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 48
