# IRS ICEcube PRO Connections

URL: https://irs.systems/en/docs/irs-icecube-pro/connections

![Rear of the IRS ICEcube with color-coded connections. Cooling circuit 1: left return, right supply. Cooling circuit 2: left return, right supply. Facility water connection: left return, right supply. Power supply connection. Cooling water overflow. Compressed air connection. External: left Safety, right Ethernet. Cooling water refill](/docs/assets/irs-icecube-pro/images/ice-anschluesse.jpg)

## Connector description

**Harting Q4/2 power supply**

![Harting Q4/2 connector for the power supply](/docs/assets/irs-icecube-pro/images/ice-harting-q4-2.jpg)

| Pin | Description |
| --- | --- |
| 1 | L1 |
| 2 | L2 |
| 3 | L3 |
| 4 | N |
| Protective earth (ground symbol) | PE |

**Harting Q12 Safety**

![Harting Q12 connector for Safety](/docs/assets/irs-icecube-pro/images/ice-harting-q12.jpg)

| Pin | Signal | Description |
| --- | --- | --- |
| 1 | External emergency stop | Connection of **external** potential-free contact |
| 2 | External emergency stop | Connection of **external** potential-free contact |
| 3 | Internal collective fault | **Internal** potential-free contact |
| 4 | Internal collective fault | **Internal** potential-free contact |
| 5 | Reserved | |
| 6 | Reserved | |
| 7 | Reserved | |
| 8 | Reserved | |
| 9 | Reserved | |
| 10 | Reserved | |
| 11 | Reserved | |
| 12 | Reserved | |