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Safety Relays

Safety Relays

 

When loads, such as valves or motors, cannot be driven directly by a safety PLC or by an emergency push button, an interposing relay becomes a necessity. As an example, when the power required to switch the load is greater than what can be provided by the PLC or when multiple contacts are required to be driven by the same signal, the use of a relay is a must.

In today’s high integrity applications a standard relay is no longer acceptable. Whether it is for an ESD, F&G, BMS or for any other critical application, a Safety (SIL 3) Relay must be used.

GM International SIL 3 Relays are available in various contact configurations and ratings to cover the majority of applications; they are available with standard DC as well as with AC coils.
Typical applications are shutdown or relief valves control, Fire & Gas valve control, Turbine shut down, AC/DC motors control center, etc.
For each application the specific Safety Function must be determined to select the correct Safety Relay. The Safety Function controls the operating condition of the SIF, therefore of the Safety Relay.relay

Safety Functions can be basically divided in two main groups:

  • ETS or Energize to Safety or
  • Trip and DTS De-energize to Safety or Trip.

From which there are four operating conditions:

  • NE Relay Coil – NC Relay Contacts ( Load Normally Energized )
  • NE Relay Coil – NO Relay Contacts ( Load Normally De-Energized )
  • ND Relay Coil – NO Relay Contacts ( Load Normally De-Energized )
  • ND Relay Coil – NC Relay Contacts ( Load Normally Energized )

By “NE Relay Coil” we mean a High condition (power on) at the relay coil terminals and by “ND Relay Coil” we mean the exact opposite, a Low condition (power off). NC or NO Relay Contacts determine whether power is available to the load under normal operating conditions or not; with NC contacts the load is Normally Energized and with NO contacts the load is Normally De-Energized.
The Safety Function is to revert the above operating conditions. For example, with NE relay coil and NC relay contacts, DTS Safety Function is to disconnect power to the load by removing power at the relay coil (From High to Low condition); This is the most typical SIL 3 relay function for a NE Load. Or, with a NE relay coil and NO relay contacts, ETS Safety Function is to power-on load by removing power at the relay coil (From High to Low condition).

Other aspects in selecting the safety relay are: the load’s contacts rating; the number of contacts required to be driven by the same control signal; if a single line or both lines of the load must be switched ON or OFF.

For each GMI Safety Relay, a data sheet containing schematics of all possible applications, as well as coil and contacts rating, is available.

 

 

sil_manual-211x300

      SIL-Rated Safety Relays and Informative Safety Manual

SIL Manual: Safety Instrumented System (3rd edition) is now available.

G.M International’s years of experience in safety and electronics has lead to the development of this comprehensive manual on IEC61508 and IEC 61511.

The first two editions have already been of great benefit to engineers, maintenance personnel and whoever wishes to approach the concept of functional safety.

Would you like a paper or electronic copy? Let us know, click here.

 

 

 

 

 

 

 

D1000 Series SIL RelaysD1092D

D1000 Enclosure Characteristics

High channel density resulting from innovative circuit design using advanced surface mount components.

Plug-in screw terminal blocks to secure terminations up to 2.5 mm2.

35 mm (Top Hat) DIN-Rail

22.5 mm wide DIN-Rail mounting modules.

  • D1092S         1 channel, Relay Output Module for NE and ND Loads, SIL 3    D1092S Data Sheet
  • D1092D         2 channel, Relay Output Module for NE and ND loads, SIL 3    D1092D Data Sheet
  • D1092S-069   1 channel, NE Relay Output Module, SIL 3    D1092S-069 Data Sheet
  • D1092D-069   2 channel, NE Relay Output Module, SIL 3   D1092D-069 Data Sheet
  • D1093S         1 channel, Relay Output Module for NE and ND loads with diagnostics, SIL 3    D1093S Data Sheet

 

 

 

D5000 Series SIL RelaysD5091S_A

D5000 Enclosure Characteristics

High channel density result from innovative circuit design using advanced surface mount components.

Plug-in screw terminal blocks to secure termination up to 2.5 mm2

35 mm (Top Hat) DIN-Rail

High packing density. Ultra slim 2 channels 12 mm wide

  • D5090S    5 A SIL 3 Relay Output Module for NE Load   D5090S Data Sheet
  • D5091S     5 A SIL 3 Relay Output Module for ND Load with ND or NE Relay condition     D5091S Data Sheet
  • D5094S      5 A SIL3 NE or ND with 2 x N/O Contacts –  Coming Soon
  • D5095S      5 A SIL3 NE or ND with 2 x N/C Contacts –  Coming Soon
  • D5290S     10 A SIL 3 Relay Output Module for NE Load     D5290S Data Sheet
  • D5290S-078    5 A SIL 3 Relay Output Module for NE or ND Loads with NE or ND Relay condition D5290S-078 Data Sheet
  • D5290S-079    5 A SIL 3 Relay Output Module (115 Vac coil voltage) for NE or ND Loads with NE Relay condition  D5290S-079 Data Sheet
  • D5290S-080  10 A SIL 3 Relay Output Module for NE Load and 115 Vac coil voltage   D5290S-080 Data Sheet
  • D5290S-084  5 A SIL 3 Relay Out Module (110 Vdc coil voltage) for NE or ND Loads with NE Relay  D5290S-084 Data Sheet
  • D5291S     10 A SIL 3 Relay Output Module for ND Load with ND or NE Relay condition     D5291S Data Sheet

 

 

 

D5000 Series Smart SIL Relaysdownload

Switching of Safety-Related circuits demands the use of specific SIL certified Relay Output modules, capable of delivering the highest grade of availability and functional safety.
These units are so much more than just a relay; they not only perform the desired safety function, but also provide full Load & Line Internal Diagnostics: load voltage and current, load resistance (patented), leakage from load to earth, coil integrity and internal faults. Moreover, MODBUS communication allows the units to be remotely interrogated and configured.
Hardware is SIL 3 certified, while diagnostic functions are now also SIL 2 certified by TUV: they remain two independent features, which can be used separately or together.

For installation in Zone 2 / Div. 2 Hazardous location. All models are ATEX, IECEx and SIL certified.

  • D5096S     NE or ND with 2 x N/O Contacts and diagnostics  –  Coming Soon
  • D5097S     NE or ND with 2 x N/O Contacts and diagnostics  –  Coming Soon
  • D5293S     4 A SIL 3 Relay Out Module for NE Load with Load and Line diagnostic     D5293S Data Sheet
  • D5294S     4 A SIL 3 NO contact Relay Out Module for NE or F&G/ND Load with open/short circuit diagnostic        D5294S Data Sheet
  • D5295S        4 A SIL 3 NC contact Relay Out Module for NE or F&G/ND Load with open/short circuit diagnostic     D5295S Data Sheet

 

 

 

 

 

D5000 Series SIL3 Loop Powered Switch RepeatersD5093S-D

Switching of Safety-Related circuits demands the use of specific SILcertified Relay Output modules, capable of delivering the highest grade of availability and functional safety.
These units are so much more than just a relay; they not only perform the desired safety function, but also provide full Load & Line Internal Diagnostics: load voltage and current, load resistance (patented), leakage from load to earth, coil integrity and internal faults. Moreover, MODBUS communication allows the units to be remotely interrogated and configured.
Hardware is SIL 3 certified, while diagnostic functions are now also SIL 2 certified by TUV: they remain two independent features, which can be used separately or together.

For installation in Zone 2 / Div. 2 Hazardous location. All models are ATEX, IECEx and SIL certified.

  • D5093S      Single Channel loop powered Digital I/P (24-220 VAC /VDC  D5093S Data Sheet
  • D5093D     Dual Channel loop powered Digital I/P (24-220 VAC /VDC  D5093D Data sheet