Leaders in:
Voltage Dip-Proofing
Earth Continuity Monitoring
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Our Voltage Dip Proofing Inverter (DPI) product line is ideal for for industrial applications that require protection against momentary interruptions and sags.It offers a simple cost effective solution that is easy to integrate into OEM products or retrofit to existing equipment. The DPI provides complete protection for all sag depths and interruptions from 0 to 3 seconds. Note that in order achieve the support time needed to match your application it is necessary to select a DPI of the correct size based on supply voltage, load current & power factor for the supported load. Sizing information is available at DPI & VDC Ranges>DPI Tools.
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- Designed to be maintenance free for harsh industrial environments.
- Easy 4 wire installation.
- Wide range for loads of 2 to 25 amps.
Voltage Dip Proofing Inverter (DPI).
Our range of Voltage Dip Compensators (VDC) is intended for applications where the supply is subject to voltage dips down to -50% for the nominal supply voltage. The VDC provides an economic solution for users who require their equipment to comply with the Semi F47 standard for voltage sag immunity. Unlike the DPI the VDC does not employ energy storage technology so the device is not suitable for applications where there are momentary interruptions or sags below 50% of the nominal supply voltage. In depth information is available at DPI & VDC Ranges>VDC. Click here to go there.
- Economic solution for applications where there are supply voltage dips only.
- Designed to be maintenance free for harsh industrial environments.
- Small footprint.
- Easy 4 wire installation.
Voltage Dip Compensator (VDC).
GCM-52 Earth Continuity Monitor.
Earth leakage relays perform two main functions on mining installations: to protect machinery from damage and to make the installation safer for personnel. Earthing must be solid and reliable for electrical installations to be safe. For this reason, machinery is earthed via the supply cable, using either a copper conductor of the cable or the armour. If there is a break or high resistance fault in the earth return the voltage developed could be fatal to personnel exposed to this hazard. Continuous monitoring of the earth bond is imperative if safety standards are to be maintained.
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SWITCHING SYSTEMS' range of EARTH CONTINUITY MONITORS provide a cost effective solution to the problem.
GCM-52 Mini Earth Continuity Monitor.
Earth leakage relays perform two main functions on mining installations: to protect machinery from damage and to make the installation safer for personnel. Earthing must be solid and reliable for electrical installations to be safe. For this reason, machinery is earthed via the supply cable, using either a copper conductor of the cable or the armour. If there is a break or high resistance fault in the earth return the voltage developed could be fatal to personnel exposed to this hazard. Continuous monitoring of the earth bond is imperative if safety standards are to be maintained. Note that the “Mini” is a smaller version of the standard GCM-52 functionality is identical.
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SWITCHING SYSTEMS' range of EARTH CONTINUITY MONITORS provide a cost effective solution to the problem.
The MSR8-525V-NI Pilot Wire Relay continuously monitors the continuity of the earth bond using an electrical measuring signal fed into the earth conductor via a separate pilot wire. A two wire remote module is used to detect a short between the pilot wire and earth. The measuring signal is intrinsically safe and gases such as methane or hydrogen cannot be ignited by it. If both sensing and remote control functions are required a three wire remote module must be used.
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- Monitor earth continuity with optional remote control.
- Use in low noise applications with noise level below 2Vac
- Maintenance item do not use in new projects, refer MP130-ni.
Pilot Wire Control Relays.
The MSR9-NI Pilot Wire Relay continuously monitors the continuity of the earth bond using an electrical measuring signal fed into the earth conductor via a separate pilot wire. A two wire remote module is used to detect a short between the pilot wire and earth. The measuring signal is intrinsically safe and gases such as methane or hydrogen cannot be ignited by it. If both sensing and remote control functions are required a three wire remote module must be used.
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- Monitor earth continuity with optional remote control.
- Use in high noise applications with noise level below 12Vac
- Direct replacement for MSR9.
Pilot Wire Control Relays.
The GBP4-NI Pilot Wire Relay continuously monitors the continuity of the earth bond using an electrical measuring signal fed into the earth conductor via a separate pilot wire. A two wire remote module is used to detect a short between the pilot wire and earth. The measuring signal is intrinsically safe and gases such as methane or hydrogen cannot be ignited by it. If both sensing and remote control functions are required a three wire remote module must be used.
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- Monitor earth continuity with optional remote control.
- Use in high electrical noise environments with noise level below 12Vac
- The GBP4-ni is a direct replacement for the GBP4, GBP5 & MP130.
Pilot Wire Control Relays.
The MP130-NI Pilot Wire Relay continuously monitors the continuity of the earth bond using an electrical measuring signal fed into the earth conductor via a separate pilot wire. A two wire remote module is used to detect a short between the pilot wire and earth. The measuring signal is intrinsically safe and gases such as methane or hydrogen cannot be ignited by it. If both sensing and remote control functions are required a three wire remote module must be used.
Click here for more information.
- Monitor earth continuity with optional remote control.
- Use in high electrical noise environments with noise level below 12Vac
- The MP130-ni should be considered for all new applications.
Pilot Wire Control Relays.
The PSR11 Phase Sequence Relay drops the power supply contactor if the phase sequence of the supply is incorrect. The direction of rotation is a vital factor in the case of drives for pumps, fans, compressors and conveyors. In certain circumstances, particularly where mobile equipment is employed, it is advisable to monitor the direction of rotation and to disconnect the power source if the drive runs in the reverse direction. The unit is usually situated at the load center and is wired in conjunction with a pilot wire relay for contactor control.
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- Monitors reverse phase and phase failure conditions.
- DIN Rain mounting.
Other Products often used together with Pilot Wire Relays.
The RPF Reverse Phase Fault Relay drops the power supply contactor if the phase sequence of the supply is incorrect. The direction of rotation is a vital factor in the case of drives for pumps, fans, compressors and conveyors. In certain circumstances, particularly where mobile equipment is employed, it is advisable to monitor the direction of rotation and to disconnect the power source if the drive runs in the reverse direction. The unit is usually situated at the load center and is wired in conjunction with a pilot wire relay for contactor control.
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- Monitors reverse phase and phase failure conditions.
- DIN Rain mounting.
Other Products often used together with Pilot Wire Relays.
The EFLR-550 Earth Fault Lockout Relay prevents the power supply contactor from closing if an earth fault is present on the cable. This ensures that only healthy circuits are energized, eliminating damage to equipment and protecting personnel from potential shock hazard.The unit is normally situated at the load center and is used in conjunction with a pilot wire relay for contactor control.
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- Monitors earth fault condition.
- A 1100V version is also available.
Other Products often used together with Pilot Wire Relays.
Switching Systems, was founded by F V Fischer and began operations in 1971 with the development and production of intrinsically safe earth continuity monitoring systems for the mining industry and over the last five decades, the company became the leading designer and manufacturer in this field. Switching Systems is a permit holder for the SABS mark for intrinsic safety and is a member of the South African Flameproof Association.
In the early 1980’s it was realized that there was a growing need for a device that would harden the control gear used in continuous industrial processes against the disruptive effects of momentary voltage dips and outages. It was during this period that the technology known as Voltage Dip Proofing was developed.
As an industry leader in industrial electronics, Switching Systems was approached in 1989 by ESKOM to develop a solution to problems they were encountering within their own power plants due to voltage dips. Currently the fifth largest utility in the world, they were experiencing drives and motors tripping due to voltage dips caused primarily by short circuits. They had suffered many trips on large fossil generating units and even tripping of complete power stations due to short circuits in the 22kV switchyard. The depression in supply voltage to the auxiliary system resulted in the contactors dropping out, stopping drives, which are critical to the continuous running of the generating units.
During the early 1970’s ESKOM installed auto re-close systems on auxiliary system drives but found them ineffective, and although they had UPS’s on their computer equipment, wanted specialized protection for the sensitive equipment in their motor control centers and switchboards. Subsequently, over a two-year period, a unique custom solution was developed by Switching Systems and successfully installed during 1990 and 1991 in all ESKOM large fossil power stations.
A range of DPI’s was developed and introduced to accommodate different applications. These ranged from 250VA to 4kVA, 110V AC to 240V AC and 50 or 60Hz. Designed to be used in different markets, the DPI is now exported worldwide, and is complimented by a range of Voltage Dip Compensators (VDC) for use in applications where equipment must comply with the F47 standard for semiconductor production equipment.
Switching Systems staff is a team dedicated to providing product quality and service excellence. Our innovative spirit and continuous product improvement ensures the reliability of our products.
We look forward to being of service to you.