Polarity Switch is mainly controlled by FGC3, and protects itself against changing state at higher current than 5A.
It can also exchanges signal with Power Module and Discharge system through 2 Interlock Interfaces / connectors.

Polarity Switch can send, in case of an internal fault:

• An interlock directly to the Power Supply to stop it.
• An interlock directly to activate the Magnet Energy Discharge system if present to handle magnet energy.

Polarity Switch can receive an interlock freezing its powering status, ignoring any changing state command:

• From the Power Supply: Powering Status signal (Power On), or DCCT 0A contact.
• From the Magnet Energy Discharge system (end of discharge, status).

Polarity Switch is mainly controlled by FGC3, and protects itself against changing state at higher current than 5A.
It can also exchanges signal with Power Module and Discharge system through 2 Interlock Interfaces / connectors.

Polarity Switch can send, in case of an internal fault:

• An interlock directly to the Power Supply to stop it.
• An interlock directly to activate the Magnet Energy Discharge system if present to handle magnet energy.

Polarity Switch can receive an interlock freezing its powering status, ignoring any changing state command:

• From the Power Supply: Powering Status signal (Power On), or DCCT 0A contact.
• From the Magnet Energy Discharge system (end of discharge, status).

Polarity Switch is mainly controlled by FGC3, and protects itself against changing state at higher current than 5A.
It can also exchanges signal with Power Module and Discharge system through 2 Interlock Interfaces / connectors.

Polarity Switch can send, in case of an internal fault:

• An interlock directly to the Power Supply to stop it.
• An interlock directly to activate the Magnet Energy Discharge system if present to handle magnet energy.

Polarity Switch can receive an interlock freezing its powering status, ignoring any changing state command:

• From the Power Supply: Powering Status signal (Power On), or DCCT 0A contact.
• From the Magnet Energy Discharge system (end of discharge, status).

Signal	Pin	Cde/Status	Description
POLSWPOS_NOT	01	Status Out	01-03: closed → Current Polarity Switch Status = Positive
POLSWNEG_NOT	02	Status Out	02-03: closed → Current Polarity Switch Status = Negative
0V	03	GND
POLSW_FAULT	04	Status Out	04-06: open → Polarity Switch in fault status. POLSW_FAULT = POLSW_FAULT1 = POLSW_FAULT2 It could be related to internal power supply or too hot inner temperature.Required as soon as the unit can fall in fault (latched). This NEW signal allows the use of a intelligent Polarity Switch using internal internal faults. A high current switch could quickly be very hot in case its contactor contacts are damaged.
POLSW_LOCKED	05	Status Out	05-06: close→ Polarity Switch can be controlled to change state (output current monitored is higher than safe values). This NEW signal was added so that FGC3 can report Polarity Switch status in case the change of polarity is not allowed by the switch itself.
0V	06	GND
POLSW_RESET_NOT	07	Cde In	07-08: closed (10ms pulse) → Reset all latched faults Required as soon as the unit can fail in fault (latched). Power converter & Polarity Switch are using the same Reset_Not signal. Not a pure creation, just re-use (must travel through the connector) signal sent by FGC3 to converter and available on backplane.
0V	08	GND
Vcc	09	Pwr In	This Power line (+24 VDC, 0.1 ADC) is used to provide energy to relays or contactors to a "controlled unpowered" unit acting on motors only for example and without any local electronics. Required for compatibility with no-electronic management polarity switch.
POLTOPOS_NOT	10	Cde In	10-12: closed (10ms pulse) → Polarity swith goes to Positive state
POLTONEG_NOT	11	Cde In	11-12: closed (10ms pulse) → Polarity swith goes to Negative state
0V	12	GND

SKPOLCTRL 12-pin male Burndy Connector Pin assignment, located on Polarity Switch Front Panel edms

Signal	Pin	Cde/Status	Description
POLSW_FAULT1+	1	Status Out	1-2: open → Polarity Switch in fault. POLSW_FAULT1 = POLSW_FAULT Isolated Contact
POLSW_FAULT1-	2
POLSW_INTLK1+	3	Intlk In	3-4: open → Polarity Switch will not change state, ignoring such command (POLSW_LOCKED state). Pol. Switch Grounded locally
POLSW_INTLK1-	4

SKPOLINTLK1 4-pins male Burndy Connector Pin assignment, located on Polarity Switch Front Panel edms

Signal	Pin	Cde/Status	Description
POLSW_FAULT2+	1	Status Out	1-2: open → Polarity Switch in fault. POLSW_FAULT2 = POLSW_FAULT Isolated Contact
POLSW_FAULT2-	2
POLSW_INTLK2+	3	Intlk In	3-4: open → Polarity Switch will not change state, ignoring such command (POLSW_LOCKED state). Pol. Switch Grounded locally
POLSW_INTLK2-	4

SKPOLINTLK2 4-pins female Burndy Connector Pin assignment, located on Polarity Switch Front Panel edms

Interfaces Graphical Overview

Signal	0	1	2	3	4	5	6	7	8	9	10	11	Comment
POLSW_INTLK1	1 3-4:open			0 3-4:Short					1 3-4:open				Converter Power On status 1: converter ON 0: converter OFF
POLSW_INTLK2	1 3-4:open					0 3-4:Short				1 3-4:open			External Disch. R status 1: closed, not dissipating 0: Open, discharging Ej
MOVABLE STATUS	0					1			0				Signal based on POLSW_INTLK1 x POLSW_INTLK1

Chronograms illustrating 2 clients (1 per SKPOLINTLK interface)