59
- Mission duration 20 years.
A periodic annual check is required. See annex maintenance test section.
The K4 safety relay monitors the status of the HPS switches as well as the compressor power contactor.
His security contacts are closed under the following conditions :
• No overpressure, closed HPS contacts and no short circuit
• No failure of the power contactor
Activation of one of the two HPS causes the opening of the safety contacts of the K4 relay which causes the
opening of the power contactor and the activation of the gate kill input of the VFD.
The functionality and setting of this safety loop must be checked at least annually, in accordance with the
applicable national regulations. See annex XX for the test procedure.
3.6.3.2 Operation, commissioning and reset
The diagram below is for illustration: refer to the wiring diagram supplied with the machine for detailed information.
1. HPS spare : Non active pressure switch
2. HPS : active pressure switch
3. Reset : button reset
4. K101 : main power contactor
5. Logic
6. Safety relay K4
7. K2 control relay
8. To control (status feedback)
9. K101
10. Gate kill
11. Compressor
Figure 32 – SRMCR description
The K4 safety relay monitors the status of the two active pressure switch (HPS) sensors, the absence of a short-
circuit between the sensors, and the position of the K101 contactor power contacts.
After switching on, the closing of its safety contacts is carried out by pressing the Reset button if the following
conditions are met:
The contacts of the pressure switches are closed (no overpressure)
Contactor K101 is open: its auxiliary NC contact is closed.
The safety contacts open when an HPS sensor is opened.
This causes the opening of the contactor K101 by removing the voltage that supplies its coil. The drive power is off
(K101) and the Gate Kill input of the drive is open; each of his actions being sufficient to stop the compressor.
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