ANNEXURE 1

Technical Specifications for DC Regulated Power Supplies

1. Scope of Supply DC regulated power supplies. Quantity: 150 Nos. 2. Qualification of Bidders a) Bidder should have proven technical credentials in supplying such items. b) The bidder shall have a sound financial condition. To prove his credentials, the bidder shall submit balance sheets along with profit & loss statements of the last three years. The average annual average turnover of the bidder for last three years has to be more than ` 100 lakhs.

c) The bidder should have past experiences in supplying similar items to reputed firms including public sectors and R&D institutes. Documents supporting the experience and past performance on similar contracts for last 5 years should be submitted along with the quotation. d) Offer may liable to be rejected, if proof of past experience of supplying similar items is not provided along with quotation. 3. Table 1: Technical Specifications * Sr. Technical Parameters Values 1 AC input voltage range 3 phase AC 380-480V, (50-60 Hz ± 3% ) 2 Current consumption ≤ 3x 2.0 A (400 V AC) for full rated output 3 Power factor ≥ 0.86 at (400 V AC) at full rated output 4 Inrush surge current ≤ 6 A (peak) 5 Hold up time ≥ 20 ms (400/480 V AC) 6 Surge protection Active filtering of input transient 7 Output voltage DC 48-54 V (48 V nominal value), remotely adjustable 8 Output current ≥ 20 A (continuous) and ≥ 30 A (pulse, for minimum of 4 s duration) at 48 V output 9 Parallel and series Capable of parallel and series operation for enhanced current and operation voltage respectively

10 Residual ripple ≤ 200 mVPP (20 Hz to 20 MHz, 50Ω) at 48V, 20A 11 Efficiency ≥ 95 % at full rated output 12 Line regulation ≤ 20 mV, for 350 V AC to 500 V AC 13 Load regulation ≤ 50 mV for single use 14 Connection type Screw / spring cage (terminal block) conforming IP 20 15 Maximum power No load/ nominal load ≤ 20 W/50 W dissipation 16 Dimensions ≤ Width 130 mm, Height 130 mm, Depth 130 mm 17 Isolation resistance ≥ 5 Minput to output, at 500V DC 18 Monitoring Signals DC- OK relay – contact rating 30V, 1 A (indicating output voltage drop by more than 10%), Overload indicator 19 Operational ambience 10 °C to 60 °C and 10-95% r. H. 20 Mounting position Horizontal DIN rail NS 35

Page 1 of 4 21 Degree of protection IP20, Class of protection I, with PE connection 22 Electrical safety Conforming to EN 60950-1 23 Output Protection Against no load , overload and short circuit 24 Operation on only 2 AC Capability to operate against phase-loss failure without any phase external device 25 Provision for buffer unit Capability desired without any control wiring with additional buffer unit for un-interrupted supply in case of mains failure 26 Remote control of output External facility for adjusting the output from 48-54 V DC with reference to negative terminal of the supply (output) 27 Start-up delay < 1 s for single use 28 Shutdown feature Capability for switching off the output with external signal switch or an external voltage 29 Cooling By convection cooling without requiring external fan

30 EMC Immunity to RF Conforming to EN 61000-4-3 in 100 MHz to 1 GHz

31 Electromagnetic emission Conforming to EN 61000-6-3 and EN61000-6-4

32 Protection Input fuse (internal) protected. Should meet IP20 standard 33 Repetitive pulse loading Capable of pulse loading up to 150% of nominal current for minimum 40% duty cycle and 4 s pulse duration 34 Load to supply Capable to supply resistive, capacitive or inductive load 35 Back feeding Should be capable to handle back voltage up to 60 V DC. 36 Warranty Minimum 2 years from the date of acceptance * All specifications shall apply to the operation on 48 V DC output. 4. Application These DC power supplies will be employed to power RF amplifier. As the supplies will be used in RF environment their EMI/EMC specifications are important. These supplies will be used in an enclosure and is intended for industrial control and instrumentation equipment. 5. Acceptance criteria a) In the event of placement of the purchase order, the supplier should submit a sample power supply for technical evaluation at our site. This sample will be used to bias one UHF solid-state RF amplifier (with output power in 500-600 W range). Technical evaluation will be done for the supplied sample with the help of standard measuring equipment like oscilloscope, spectrum analyser and power sensors. It will be tested for conforming values of the parameters as per the tender specifications. Supplier should deliver balance quantity only after this approval. The balance DC power supplies will be accepted at our site after making physical inspection and electrical test/ measurement. Supplier should replace defective items (if found after testing) at site, without any additional cost. b) Final delivery should include certificate with test reports for all delivered items. 6. Technical Particulars for inclusion in the offer

Page 2 of 4 The bidder should compulsorily mention make, model and values for each and every parameter, mentioned under the following table, in the quotation. It should be duly certified by them, along with supporting documents, if any. Evaluation of the bids will be based on this table.

Table 2: Technical Particulars for inclusion in quoted offer/ Compliance Sheet Sr. Technical Values Bidders Quoted Remarks on Parameters Parameters Compliance/Deviations (Must be quoted) 1 Make of quoted item 2 Model of quoted item 3 AC input voltage 3 phase AC 380-480V 50-60 Hz range 4 Current consumption ≤ 3x 2.0 A (400 V AC) for full rated output 5 power factor ≥ 0.86 at (400 V AC) at full rated output 6 Inrush surge current ≤ 6 A (peak) 7 Hold up time ≥ 20 ms (400/480 V AC)

8 Surge protection Active filtering of input transient 9 Output voltage DC 48-54 V (48 V nominal value), remotely adjustable 10 Output current 20 A (continuous) and ≥ 30 A (pulse, for minimum of 4 s duration) at 48 V output 11 Parallel and series Capable of parallel and series operation operation for enhanced current and voltage respectively

12 Residual ripple ≤ 200 mVPP (20 Hz to 20 MHz) 13 Efficiency ≥ 95 % at full rated output 14 Line regulation ≤ 20 mV, for 350 V AC to 500 V AC 15 Load regulation ≤ 50 mV for single use 16 Connection type Screw / spring cage (terminal block) confirming IP 20 17 Maximum power No load/ nominal load ≤ 20 W/50 W dissipation 18 Dimensions ≤ Width 130 mm, Height 130 mm, Depth 130 mm 19 Isolation resistance > 5 MΩ input to output, at 500V DC 20 Monitoring Signals DC- OK relay – contact rating 30V, 1 A (indicating output voltage drop by more than 10%), Overload indicator 21 Operational ambience 10 °C to 60 °C and 10-95% r. H. 22 Mounting position Horizontal DIN rail NS 35 23 Degree of protection IP20, Class of protection I, with PE connection 24 Electrical safety Conforming to EN 60950-1 25 Output Protection Against no load , overload and short circuit

Page 3 of 4 26 Operation on only 2 Capability to operate against phase-loss AC phase failure without any external device 27 Provision for buffer Capability desired without any control unit wiring with additional buffer unit for un- interrupted supply in case of mains failure 28 Remote control of External facility for adjusting the output output from 45-52 V DC 29 Start-up delay < 1 s for single use 30 Shutdown feature Capability for switching off the output with external signal switch or an external voltage 31 Cooling By convection cooling without requiring external fan

32 EMC Immunity to RF Confirming to EN 61000-4-3 in 100 MHz to 1 GHz 33 Electromagnetic Confirming to EN 61000-6-3 and emission EN61000-6-4 34 Protection Input fuse (internal) protected. Should meet IP20 standard 35 Repetitive pulse Capable of pulse loading up to 150% of loading nominal current for minimum 40% duty cycle and 4 s pulse duration 37 Load to supply Capable to supply resistive, capacitive or inductive load 38 Back feeding Should be capable to handle back voltage up to 60 V DC. 39 Warranty Minimum 2 years from the date of acceptance 40 Whether Test reports will be included with final delivery? 41 Whether Item will be shipped in OEM pack? 42 Whether balance sheets for last 3 years attached?

7. General conditions a) Supplier should deliver items in properly sealed OEM packing. b) Data sheet of quoted item from original manufacturer shall be attached in the offer. c) Along with the quotation, the bidder has to submit documents related to DC power supply scheme, design features, control and protection features and credentials as mentioned in this document.

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