Sigma Di (Di stands for Distributed Inverter) is a series of low to high-rise traction elevator models of Sigma Elevator Company, made from 2001 until around the early 2010s. It was originally a product developed by LG Industrial Systems in the late 1990s.
In South Korea, Di was produced by LG Industrial Systems (LG's elevator division) from 1997 to 1999, by LG-OTIS (and later OTIS-LG) from 1999 to 2006 and by Otis Elevator Korea since 2006. For overseas markets, it was sold under the "Sigma" name between 2001 and 2013.
Description[]
Di is a geared and gearless traction elevator for mid to high-rise buildings, although sometimes it can also be used for low-rise buildings. It consists of five models; Di1 for low to mid-rise buildings, Di2 for mid-rise, Di3 for mid-rise buildings, Ds4 and Di5 for high-rise. Di1, Di2 and Di3 use geared machines while both Ds4 and Di5 use gearless machines.
It features a microprocessor control which distributes microprocessors to the controller, elevator car-top and operating fixtures using Insulated Gate Bipolar Transistor (IGBT).
It is a successor of LG's L, M and H series. Its domestic competitors were Hyundai's STVF and LUXEN (LXVF) and Dong Yang's/thyssenkrupp Korea's DY and TK series.
Models[]
Di1[]
Di1 is a model primarily for low rise buildings. It was widely installed in many low rise shopping centers, hotels and other buildings throughout the 2000s. It was originally developed by LG Industrial Systems, LG's elevator division in 1997 and continued to be made after LG merged with Otis in 1999 under the "LG-OTIS" (and later "OTIS-LG") name in South Korea and overseas markets, and since 2006 it is sold under the "Otis" name in South Korea after LG-OTIS became Otis Elevator Korea. By 2013, Di1 was recognized as a low-cost model and was applied occasionally only for remodeling (modernization) in South Korea and since late 2019 it becomes a remodeling model under the M-Kit remodeling package. Along with Ds4, Di1 is a model with a long production period of more than 20 years in South Korea.
Outside South Korea, Di1 was sold under the "Sigma" brand from 2001 until 2013. It was also occasionally sold under the "LG-OTIS" name until 2005. It was discontinued in 2013 and was succeeded by the Sigma Iris NV (ACRA since 2019).
Specs:
- Geared traction
- VVVF control
- Capacity:
- Standard Code: 450-1600 kilograms (6-24 persons)
- EN Code: 450-1600 kilograms (6-21 persons)
- Singapore & Malaysia Code: 450-1565 kilograms (6-23 persons)
- 0.5, 0.75, 1, 1.5 and 1.75 m/s speeds.
- Unknown maximum number of floors served, but most likely below 20.
- Single entrance
- Rear entrance also exist in older installations. It is unknown if this option was available in later installations.
- Up to three elevators in a group.
Di2[]
One of the Di variants for mid rise buildings. Like Di1, it was originally developed by LG Industrial Systems in 1997 and continued to be produced under the LG-OTIS/OTIS-LG (1999-2006) and Otis (since 2006) name. It was discontined in 2014 but was relaunched in 2020 as a form of a modernization model under the M-Kit modernization package in South Korea. From Di2 onwards, the button beep sounds slightly longer than Di1. It is technically a successor of LG's MVP model.
For overseas markets, it was sold under the Sigma name from 2001 until 2013 when it was succeeded by the Sigma Iris NV (ACRA since 2019) model.
- Geared traction
- VVVF control
- Capacity:
- Standard Code: 900-1600 kilograms (13-24 persons)
- EN Code: 900-1600 kilograms (12-21 persons)
- Singapore & Malaysia Code: 900-1565 kilograms (13-23 persons)
- 0.5, 0.75, 1, 1.5, 1.75, 2 and 2.5 m/s speeds. (applied less than 1.5m/s is special option for example bed or large capacity)
- Unknown maximum number of floors served, but most likely below 30.
- Single entrance
- Rear entrance also exist in older installations. It is unknown if this option was available in later installations.
- Up to three elevators in a group.
Di3[]
Di3 is another variant of Di for mid rise buildings, which was intended to fill in the gap between Di2 and Ds4 (formerly Di4). It was discontinued in 2009 because of poor sales and its ambiguous position between Di2 and Ds4. Not much is known about this model except that the speed range was between 120 and 180 meters per minute, or 2 and 3 meters per second. It was not sold outside South Korea.
Ds4[]
Ds4 is a high end high speed variant of Di designed for high rise buildings. It was first developed by LG Industrial Systems and was launched in 1997 as Di4 before it was renamed into its current name in around 2002. It is still in production in South Korea where it is now part of the Otis SkyWay model, making it one of the models with a long production period of more than 20 years (the other one is Di1). It is a successor of LG's HVP-I model.
Likewise, it was sold under the "Sigma" for overseas markets from 2001 until 2013 when it was succeeded by the Sigma Iris 3 model.
- Gearless traction
- VVVF control
- Capacity:
- Standard Code: 1000-1600 kilograms (15-24 persons)
- EN Code: 1000-1600 kilograms (13-21 persons)
- Singapore & Malaysia Code: 1020-1565 kilograms (15-23 persons)
- 2, 2.5, 3, 3.5 and 4 m/s speeds.
- Unknown maximum number of floors served, but they are able to serve more than 20 floors.
- Single entrance. It is unknown if rear entrance was available.
- Up to three elevators in a group.
Di5[]
Di5 was launched in 1998 as a high speed variant of Di and a successor of LG's HVP-II model. It was also considered as a flagship model of LG/LG-OTIS/Otis Korea. The difference between this model and Ds4 is that this model has a maximum speed of 7 meters per second. It was discontinued in favor of Otis SkyWay in South Korea and Sigma Iris 3 for overseas markets.
- Gearless traction
- VVVF control
- Capacity:
- Standard Code: 1150/1350/1600 kilograms (17/20/24 persons)
- EN Code: 1200/1350/1600 kilograms (15/18/21 persons)
- Singapore & Malaysia Code: 1155/1360/1565 kilograms (17/20/23 persons)
- 3, 4, 5, 6 and 7 m/s speeds.(applied less than 4m/s is special option for example bed or large capacity)
- Unknown maximum number of floors served, but they are able to serve more than 30 floors.
- Single entrance
- Rear entrance also exist in older installations. It is unknown if this option was available in later installations.
- Up to three elevators in a group.
Notable installations[]
- Installations under the Sigma name: List of notable Sigma Di elevator installations
- Installations under the LG-OTIS name: LG-OTIS#Notable installations
External links[]
- Passenger Elevator - Sigma Elevator Company (Archived)
- Di Mid Rise brochure (2004 edition) (Archived)
- Di High Rise brochure (Archived)
- Di2 (Korean) - Otis Elevator Korea (Archived)
- Ds4 (Korean) - Otis Elevator Korea (Archived)
- Di5 (Korean) - Otis Elevator Korea (Archived)