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oi 10M N aq 0, 1 W I Leis] <br />N I a ON WON M <br />NOTE: On new installation, and when replacing boards, <br />verify jump jack settings for the proper site <br />configuration. Prior to applying power, see MDE- <br />2713 Universal Distribution Box Installation <br />manual. <br />NOTE: If G-CATrms are connected to boards configured for <br />45ma operation, the MPU boards will be damaged. <br />The dispenser current regulator section ensures that the <br />proper current (selected by the 45ma/20ma jumper) flows <br />through the loops. All dispensers and CRINDTMs must <br />have the distribution board set for 45ma. The loop voltage <br />will vary with changes in the AC line voltage, but should <br />always be between +9VDC and +15VDC (Open Loop). <br />When dispensers are connected, and operating normally, <br />the voltage reading across the loop will be about 1.5VDC <br />(pulsing).. <br />There is one indicator LED for each current loop. The <br />LED status can be interpreted as: <br />ON Open current loop or Isolate. <br />OFF Current loop OK, No data transmission <br />FLASHING Normal operation, data being transmitted. <br />(The LED normally appears to be dimly lit. <br />This is because it is flashing so fast it cannot <br />be detected.) <br />The dispenser/G-CATTM current loop setting can be <br />checked for proper settings using the following procedure: <br />1. Disconnect the field wiring connectors from the board. <br />2. If the unit is set for TWI input, change to RS -422 and <br />remove JP14. (See MDE-2713 for Jumper Settings). <br />3. Set multimeter for current (ma) measurement. <br />4. Set NORMAL/ISOLATE jumpers to NORMAL. <br />NOTE: When jumpers are set to ISOLATE; there is no <br />voltage on the + pin of the MTA connector. <br />5. Connect the positive meter lead to the + pin of any <br />output channel. Connect the negative meter lead to <br />the corresponding - pin. Measure current: <br />45ma - meter should show 42 to 48ma. <br />20ma - meter should show 18 to 24ma. <br />6. If unit is intended for TWI input, change jumpers from <br />RS -422. <br />7. Replace JP14. <br />8. Replace field wiring connectors. Set NORMAL/ISO- <br />LATE jumpers for each channel. <br />MDE-2714A • Universal Distribution Box Service Manual • 02196 Page 9 <br />