The Di[1] (Distributed Inverter) are a series of traction elevator models produced by Sigma Elevator Company between 2000 and 2012. Originally having been introduced in the 1997 by LG Industrial Systems as the successor of their L, M and H series, the Di series later came under the LG-OTIS trademark when Otis acquired LG Industrial Systems' elevator and escalator division right around 1999-2000, with units exported to overseas markets being distributed under the Sigma brand (though some export units retained the LG-OTIS branding).
For much of the 2000s, the Di series was main traction elevator model produced by Sigma (LG-OTIS, later Otis Elevator Korea in South Korea), spanning low-, mid- and high-rise applications. It was discontinued in 2013 with Otis Korea selling its Changwon manufacturing facility (where it had been producing its elevators) to LG Electronics and moving production to China. It was succeeded by Sigma's Iris 3 and Iris NV (now ACRA) series.
Features[]
Distributed control[]
A distributed microprocessor control whereby elevator functions are split across multiple microprocessors split across the elevator car, hall and the main controller, compared to a conventional centralized control system where all functions are handled by the main controller situated in the machine room, thus improving reliability and performance. Serial link technology links each of the microprocessors across the distributed control network, thus reducing the wiring needed to be laid in the elevator shaft.
VVVF inverter drive control[]
The Di series uses VVVF (variable-voltage variable-frequency) inverter drive control with IGBT (insulated-gate bipolar transistor) technology. The use of IGBTs in the inverter drive allows for lower noise levels.
VVVF door control[]
The door control system on the Di series uses VVVF inverter drives, which allows for lower noise levels while ensuring smooth operation.
AI group control[]
The Di series implement an AI group control system with fuzzy logic to handle floor traffic effectively and efficiently.
Model description[]
Di1[]
The Di1, the lowest in the range was designed primarily for low-rise applications, being the successor of GoldStar/LG's L series and lower speed Goldstar/LG's M series. Mainstream production discontinued in 2013 with it only being used for some modernisations of older elevator models in South Korea. However, since 2019, it was reintroduced as a modernization solution under the M-Kit remodelling package. Outside South Korea, the Sigma Di1 was discontinued in 2013 and was succeeded by the Sigma Iris NV (ACRA since 2019).
Known specifications[]
- AC VVVF geared traction
- Microprocessor control (Sigma/Otis Korea SKA)
- Up to 4 elevator cars in a group.
- Rated capacities:
- 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)
- Rated speeds: 1 / 1.5 / 1.75 metres per second (60-105 m/min)
- Door options:
- Single-speed center-opening
- Two-speed telescopic side-opening
Di2[]
The Di2 was the successor of Goldstar/LG's M series and lower speed Goldstar/LG's H series, being designed for low- and mid-rise applications. It was discontinued in 2014 but was relaunched in 2020 as a modernization model under the M-Kit modernization package in South Korea. It was discontinued in overseas markets in 2013 when it was succeeded by the Sigma Iris NV (known as ACRA since 2019).
Known specifications[]
- AC VVVF geared traction
- Microprocessor control (Sigma/Otis Korea SKA)
- 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)
- Rated speeds: 2 and 2.5 metres per second (120 and 150 m/min)
- Door options:
- Single-speed center-opening
- Two-speed telescopic side-opening
Di3[]
The Di3 is another variant for mid-rise buildings, developed as a model to fill the gap between the lower-end Di2 and the higher end Ds4 (formerly Di4). Not much is known as the model except the rated speeds were between 2 and 3 m/s (120-180 m/min) and was only sold in South Korea It was discontinued in 2009 because of poor sales and its ambiguous position between Di2 and Ds4.
Ds4[]
The Ds4 is a high-speed variant of Di designed for medium and high-rise applications, developed as the successor of the GoldStar/LG HVP-I series. It was originally called the Di4 when it was introduced in 1997 until when it was renamed into the Ds4 around 2002. The Ds4 later evolved to become part of the Otis SkyWay model in South Korea, with it being discontinued in export markets in 2013, having been succeeded by the Sigma Iris 3 model.
Known specifications[]
- AC VVVF gearless traction
- Microprocessor control (Sigma/Otis Korea SKA)
- Up to 8 elevators in a group
- Rated capacities:
- 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)
- Rated speeds: 2 / 2.5 / 3 / 3.5 / 4 metres per second (120-240 m/min)
- Unknown maximum number of floors served, but they are able to serve more than 20 floors.
- Door options:
- Single-speed center-opening
- Two-speed telescopic side-opening
Di5[]
The Di5 is an ultra-high-speed variant of Di, designed for high-rise applications as a successor of Goldstar/LG's HVP-II series. It was succeeded by Otis SkyWay in South Korea and Sigma Iris 3 for overseas markets.
Known specifications[]
- AC VVVF gearless traction
- Microprocessor control (Sigma/Otis Korea SKA)
- Up to 8 elevators in a group
- Rated capacities:
- 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)
- Rated speeds: 5 / 6 / 7 metres per second (300 / 360 / 420 m/min)
- Door options:
- Single-speed center-opening
- Two-speed telescopic side-opening
Notable installations[]
- Installations under the Sigma name: List of notable Sigma Di elevator installations
- Installations under the LG-OTIS name
Trivia and additional information[]
- Even though the Di series have intelligent levelling, they have been observed to not level quite quick.
- It has been observed door sills of higher-speed Di models, namely Ds4 and Di5 are generally thicker.
- The button beep between the different Di models varies in length. Di1 generally have a short beep, while Di2, Ds4 and Di5 models have a slightly longer beep.
- The shaft door keyhole on the Di series is L-shaped. This is not applied for the countries using triangle-shaped keyhole as a standard.
Notes and references[]
- ↑ Generally, the letters "D" and "i" are spelled out, though some pronounce it as "dee" or "die".
External links[]
- Sigma Di - Indonesia Elevator Guide
Otis Elevator Korea (Korean domestic market)[]
- Di2 (Korean) - Otis Elevator Korea (Archived)
- Ds4 (Korean) - Otis Elevator Korea (Archived)
- Di5 (Korean) - Otis Elevator Korea (Archived)
Sigma (Export market)[]
- Passenger Elevator - Sigma Elevator Company (Archived)
- Di Mid Rise brochure (2004 edition) (Archived)
- Di High Rise brochure (Archived)