Assessments - 1, GPA: 5
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3. High temperature at sensor. See chart. SWT, RWT, OAT input voltage reads too high 1. Check for open circuit wiring errors. 2. Defective sensor. Check using the chart. 3. Low temperature at sensor. See chart. LPR (when optional 0-5VDC Loop Pressure Sensor is used) input voltage reads too low. 1. Check for shorts or other wiring errors. 2. Defective Sensor. Check using the chart. 3. High pressure at sensor. See chart. LPR (When Loop Pressure Switch is used) input voltage reads too high. 1. Check for open circuit wiring errors. Start-Up and Troubleshooting WattMaster WHP Section 4 5.4.2 Checking the Loop Controller Outputs Diagram Overview SET METER TO READ DC VOLTS The analog output wiring can be checked at the Loop Controller by checking voltages on the Analog Output Connector. 12V GND AIN1 AIN2 AIN3 AIN4 AOUT2 GND -+ ALL READINGS ARE TAKEN WITH THE (-) LEAD OF THE METER ON THE GND TERMINAL + AIN5 AIN7 GND AOUT1 - Note: The Loop Controller must be powered for these tests. Measurements Meter Acceptable Range Ignore readings for any connections which are not used in the equipment. AOUT1 Pump VFD This output will vary between 0 and 10 VDC to correspond with pump pressure setpoint. AOUT2 Mod. Heat This output will vary between 0 and 10 VDC to correspond with Heat Addition setpoint. Start-Up and Troubleshooting 4-37 WattMaster WHP Section 4 5.4.3 Checking the Local Loop at a WHP Loop Controller Diagram Meter Set To Read DC Volts The indicated readings are typical of a normal operating system. Actual readings may vary slightly due to the number of units installed and other factors. Any significant deviation from these values generally indicates a problem. Note: These tests assume that a MiniLink is connected and powered up. Overview Proper loop voltages are essential for reliable communications. It is normal to see fluctuations on an operating communications loop. The average value should be close to the acceptable range described below. Values will vary upon initial powerup for about 30-45 seconds. The voltages may fluctuate as normal communications occur. Measurements Local Loop Acceptable Range T – SHLD 2.9 - 3.1 Volts DC R – SHLD 1.9 - 2.1 Volts DC Action Condition Action If meter reads between 2.4 VDC and 2.5 VDC The Comm Loop “floats” at 2.4 -2.5VDC when only controllers are connected to the loop. When a MiniLink is connected it will “bias” each side of the loop to the values listed above. 1) No CommLink II or MiniLink is connected and powered up. 2) If a CommLink II or MiniLink is connected, look for “open” wiring. If voltages are too high or too low on either side One or more devices connected to this loop have damaged Comm Driver chips. Start-Up and Troubleshooting WattMaster WHP Section 4 5.4.4 Checking WHP Loop Controller Driver Chip Meter Set To Read DC Volts Note: These tests assume that the controller being checked is powered up. Diagram This check is intended to determine if the Comm Driver chip on a controller is damaged. Damage typically occurs when the communications loop is exposed to excessive voltage, as may occur during installation, due to wiring errors. The driver chips are socketed on all boards to facilitate servicing. It is unusual for driver chips to fail during normal operation. Almost all failures occur as a result of wiring related problems. Overview If voltages are too high or too low on either side Measurements Local Loop Acceptable Range T – SHLD 2.4 - 2.5 Volts DC R – SHLD 2.4 - 2.5 Volts DC Note: Minor variances may not indicate a problem if both tests indicate similar values. Action Condition Action The controller has a damaged Comm Driver chip. Replace the driver chip. See "1.3.11Comm Driver Chip Replacement”. Start-Up and Troubleshooting 4-39 WattMaster WHP Section 4 4-40 Start-Up and Troubleshooting 5.4.5 Comm Driver Chip Replacement LOOP CONTROLLER CPU BOARD COMM DRIVER CHIP PIN 1 ( U1 ) COMMLINK II COMMUNICATIONS DRIVER CHIP WHP CONTROLLER MINILINK COMMUNICATIONS INTERFACE PIN 1 WHP CONTROLLER COMM DRIVER CHIP ( U5 ) WARNING! USE EXTREME CAUTION WHEN REMOVING ANY CHIPS TO AVOID DAMAGING ANY CIRCUIT BOARD TRACES WHICH ARE UNDER THE CHIP. BE SURE THAT ANY SMALL SCREWDRIVER OR OTHER SHARP OBJECT USED TO REMOVE THE CHIP DOES NOT COME INTO CONTACT WITH THE PRINTED CIRCUIT BOARD SURFACE. A SMALL SCREWDRIVER MAY BE INSERTED BETWEEN THE CHIP AND THE SOCKET TO AID IN REMOVAL OF THE CHIP. BE VERY CAREFUL NOT TO INSERT THE SCREWDRIVER UNDER THE SOCKET!! DAMAGE TO THE BOARD IS NOT COVERED BY WARRANTY. TYPICAL RS-485 DRIVER CHIP PIN 1 DOT SOCKET PRINTED CIRCUIT BOARD LOOP 32 16 8 4 1 2 NETWORK NETWORK LOOP COMMUNICATIONS DRIVER CHIP (U5) LOCAL LOOP COMMUNICATIONS DRIVER CHIP (U8) T SH R 24VAC GND T SH R PIN 1 System Manager Comm Driver Chip (U13) Pin 1 U12 R10 Cx91 EPROM Cx13 U9 U13 CX7 PAL U8 CX8 RN1 C1 C2 EWDOG U7 X1 X2 C3 U3 CX5 R3 Ys101806 REV.2 MODULAR SYSTEM MANAGER R4 R1 U1 U6 Cx12 SC1 R13 C5 U10 CX3 CX4 CX6 R9 D3 U4 PJ1 U2 CX2 R2 R3 U3 D1 D2 R5 R6 DSPY1 P3 R7 RV1 Figure 4-11...