Siemens manual Adjusting Overcurrent contd, L-828CCRs LC-Type4, 7.5, and 10 kW/6.6 A/60 Hz

L-828 CCRs LC-Type (4, 7.5, and 10 kW/6.6 A/60 Hz) Installation

Adjusting Overcurrent (contd.)

2.See Figure 2-4. Turn switch S1 (6) to the highest brightness step, 5 for 5-step CCR or 100 for a 3-step CCR. Ammeter should read 6.6 amps.

NOTE: See Figure 3-7. Do not change the adjustment of R47 (7), since this not only will affect the output current of the CCR but the potentiometer adjustment levels for all other current levels.

3.Physically center the overcurrent potentiometer R48 (Figure 3-7, Item 8). While viewing the red overcurrent LED (Figure 2-4, Item 3) on the control panel, slowly turn R48 clockwise until the LED begins to glow. Then quickly turn control switch S1 (Figure 2-4, Item 6) to the next lower intensity step. This will turn the LED off because the current level is less.

NOTE: If the potentiometer R48 is turned too far, the CCR will shut down. If this should occur, return potentiometer R48 to the centered position and reset the CCR by momentarily turning off the CCR off and then back on.

4.While watching the overcurrent LED, return S1 to the highest intensity step, and time how long it takes for the overcurrent LED indicator to start to glow. It should take 3 ±1 seconds.

NOTE: If the LED comes on in less than 2 seconds, turn potentiometer R48 a slightly counterclockwise. If more than 4 seconds are required for the LED to light, turn R48 slightly clockwise. Repeat Step 4 until the correct time period (3 ±1 seconds) is obtained.

5.See Figure 3-7. Turn off the CCR and remove test leads from TP7 (1) and TP9 (2). The trip level for the overcurrent threshold is now calibrated for 6.93 amps.

 2002 Siemens Airfield Solutions, Incorporated	96A0104B	Page 3-13
All rights reserved	Issued 6/02