Maeraj

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Frequently Asked Questions

• Are there any technical documents for Manaras opera?

  Manaras-Opera 's operators are supplied with complete documentation, including installation and instruction manuals and wiring diagrams. However, if you have lost yours or simply need additional copies, please select the document you are looking to view from the menu below. Or visit our channel to view our videos.

• What kind of doors can a MJ / MJH jackshaft operator be used?

  1. PRODUCT APPLICATION The model MJ/MJH heavy duty jackshaft operator is designed for use on commercial or industrial doors of all types provided that the door has a shaft as basic driving element (doors with high lift, vertical lift, rolling doors and grilles).

• Where to mount the MJ and MJH operators?

  Both the MJ and MJH operators have dual output shafts and may be mounted on either the left or right hand side of the door (see Figure 2 and Figure 3). Place sprocket on either the right or the left end of the output shaft according to the desired handing. Figure 2 Left hand Figure 3 Right hand 3.1 IMPORTANT INSTALLATION INSTRUCTIONS WARNING

• Where was the first HVDC converter made?

  The invention of mercury arc rectifiers in the nine- teen-thirties made the design of line-commutated current sourced converters possible. In 1941, the first contract for a commercial HVDC system was signed in Germany: 60 MW were to be supplied to the city of Berlin via an underground cable of 115 km length.

• Why is HVDC important in an AC transmission system?

  HVDC allows power transmission between unsynchronized AC transmission systems. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power.

• Which is more reliable HVDC or alternating current?

  HVDC is less reliable and has lower availability than alternating current (AC) systems, mainly due to the extra conversion equipment. Single-pole systems have availability of about 98.5%, with about a third of the downtime unscheduled due to faults.

• Why does HVDC use the conductor cross section?

  The conductor cross section is fully utilized because there is no skin effect. For a long cable connection, e.g. beyond 40 km, HVDC will in most cases offer the only technical solution because of the high charging current of an AC cable.