The Mumbai Metropolitan Region Development Authority (MMRDA) has invited sealed quotations from Manufacturer / Distributors Dealers / Other Firms on/before December 23rd, 2020 for Development and refurbishment of Brake Translator Card for Mumbai Monorail as per the requirement :
| Sr. No | Product | Action | Qty | UoM | Basic Rate (in INR) | Total Amount (in INR) | GST (in INR) | Total Amount incl. GST(in INR) | Expected delivery date |
| 1. | Brake Translator Card (Technical details and circuit diagram attached as per annexure l) | Development & Refurbishment | 04 | Nos. | Within l-2 weeks after receiving Purchase order | ||||
| Total Amount (INR) | |||||||||
All interested vendor must visit Mumbai Monorail Depot, Wadala for inspection of our faulty items and the quotation shall he submitted accordingly.
Overview of Brake Translator:
The brake translator in the Mumbai Monorail is a bidirectional RS232 to RS485 converter. It acts as a translator for the signals from the driver control side (RS485) and the Brake Control Unit (BCU) (RS232),Information regarding the brakes (actuation,status,etc.) are worked through this translator.
- The existing brake translator card uses the ST232 and ST485 transceivers at both ends.
- The TTL signals from each of these ICs is worked to and from an ATmega168 microcontroller which presumably performs some error/packet checking from the proprietary software programmed into it.
- The microcontroller also toggles the status indication LEDs.
- The 24V supply given to this device is internally converted to a 5V/1A supply using the LM2675-5.0 fixed DC-DC converter.
- This 5V is used by all the other components, i.e. the ST232, ST485 and ATmega168.
Problems:
The Brake Translator modules were faulty, since swapping the Brake Translator modules would fix the non-communication issue between the driver control side and brake control unit (BCU).
Scope of work:
The scope of work for development and refurbishment of Brake Translator card is as given below:
- Examine all the parts and circuitry.
- Trace out the error.
- Replace the defective components.
- Repair of 04 brake translator card. The repaired brake translator cards shall be put in the system and its functionality will be observed for a week.
Source: MMRDA-Tender | Image Credit (representational): MMRDA
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