Regarding UPS power supplies
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Dear experts, I have a question: Our company deals in pharmaceutical intermediates. Regarding the new SIS system and PLC control systems installed in our factory (both of which are quite simple), do these systems require only a normal power supply, or is it necessary to use a UPS as well? Are there any corresponding **or industry standards that can be referenced? I’d like to thank you here first
If the power outage is caused by a power failure or an electrical accident, and it does not affect the operation of your system, or the system does not need to operate, and it also does not cause any damage to the equipment or the production process, then there is no problem. You can do as you please. Most of them are programs with automatic control; a power outage will cause the automatic opening and closing of valves to fail, leading to overpressure, pressure release, and other process-related accidents, so it is necessary to have one unit on hand for emergency use. However, this thing also has its drawbacks: when it’s needed, the battery life is too short, or it stops working.
A UPS power supply provides a buffer to prevent sudden power outages, thus protecting equipment and operating programs.
GB/T 50770-2013 Code for Design of Safety Instrumented Systems in Petrochemical Industries 5 Basic Design Principles 5.0.16 The AC power supply for safety instrumented systems should preferably be provided by a dual-channel uninterruptible power supply. According to the provisions, 5.0.16: Safety instrument systems for large-scale petrochemical production facilities shall employ dual independent uninterruptible power supplies. SH/T 3082-2019 Code for Design of Power Supply for Petrochemical Instruments 4. Power Supply Scope and Load Class 4.1 Power Supply Scope for Instruments 4.1.1 The power supply for instruments and control systems should include the following: a) Basic process control systems (DCS, PLC, FCS, SCADA, etc.) ； b) Safety Instrumented System (SIS) ； c) Compressor Control System (CCS) ； d) Unit Monitoring System (MMS) ； e) Flammable gas and toxic gas detection and alarm system (GDS) ； f) Online Analyzer System (PAS) ； g) Electronic instruments installed in the cabinet room and control room ； h) On-site testing, alarm instruments, and actuating elements. HG/T 20509 2014 Specification for Power Supply Design of Instruments 5.3 Uninterruptible Power Supplies 5.3.1 UPS should be used for instrument power supply in the following situations: 1 Production facilities that utilize DCS, FCS, or SIS ； 2 CCS; 3 online analyzers involved in interlocking and process control ； 4 Flammable gas and toxic gas detection and alarm systems.
Thank you all for your replies; I’m really grateful:):):):)
It’s already on SIS, so why ask? It definitely needs to be on UPS.
An UPS is necessary; at least one UPS, or two UPS units.
It’s necessary to do this; DCS and SIS need to be separated, with separate UPS units installed for each
It’s already on SIS – is it still a simple task? Hehe
As long as the load is sufficient, and the DCS does not affect the power consumption of the SIS, there is no need to set them up separately. . . It might be excessive to have separate UPS units. Is it necessary to use four separate busbars? Wouldn’t it be safer to have four separate power distribution stations as well? It would be even better to have two main transformers; ideally, the two power supplies should not come from the same area. . .