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With the power removed, check the overload settings and confirm that the settings match the full load amps listed on the process blower motor. Wait 3 to 15 minutes with the power on until the dryer indicates the overload condition has cleared then try to restart the dryer. 6Troubleshooting Troubleshooting l 6-9 Passive Alarms If the amber Acknowledge Alarm LED is blinking, the alarm is a passive alarm. The dryer continues to operate, but this problem could prevent correct drying of your material. Note that once the Acknowledge Alarm button is pressed once, the blinking amber LED becomes solid. Central When supplied for central drying applications, these passive alarms are not available. Problem Possible cause Solution P1 Process Temperature Deviation – The process temperature exceeds the deviation band as entered for the specified time. Default values are 43°F (6°C) for 5 sec. P2 Process Low Temperature – The process temperature is less than the low temperature setpoint for the specified time. Default values are 70°F (21.1°C) for 20 sec. One of the solid state relays (SSRs) failed in the closed position. The process RTD is loose or has fallen out. The air hose connections are loose. Precooler water is too cold, or the water flow rate is too high. The process RTD is loose or has fallen out. Process heater has failed. Replace the failed solid state relays (SSR). Check the process RTD and tighten if needed. Tighten all air hose connections. Check water temperature and flow settings. Adjust as necessary. Check the process RTD and tighten if needed. Check the heater fuses and resistance across each leg of the process heater. P3 Regen Temperature One of the solid state relays (SSRs) Replace the failed solid state relays Deviation – The regeneration failed in the closed position. (SSRs). temperature exceeds the deviation band for the specified The regeneration RTD is loose or has Check the regeneration RTD and tighten time. Default values are 43°F fallen out. if needed. (6°C) for 5 sec. The air hose connections are loose. Tighten all air hose connections. 6-10 l Troubleshooting Passive Alarms Problem Possible cause Solution P5 Return Air High The hopper does not contain enough Make sure your material supply system Temperature – If the return air material. is working properly. temperature is between 150 and 180°F (65.6 and 82.2°C). You are drying at a high drying tempera-Add an optional aftercooler, if one is not ture (above 250°F [121.1°C]) or running currently installed. at low throughputs. If an optional aftercooler is installed, it Turn on the water supply, or fix any does not have enough water. leaks or blockages. The aftercooler coils are dirty. Clean the aftercooler coils. The air hose connections are loose. Tighten all air hose connections. P6 Regen High Temperature One of the solid state relays (SSRs) Replace the failed solid state relays – If the regeneration tempera-failed in the closed position. (SSRs). ture exceeds the high temperature limit for the specified The regeneration RTD is loose or has Check the regeneration RTD and tighten time. Default values are fallen out. if needed. 450°F (232.2°C) for 20 sec. P7 Regen Low Temperature The regeneration heater has failed. Check the heater fuses, and resistance – The regeneration tempera-across each leg of the process heater. ture is less than the low temperature setpoint for the speci-The regeneration RTD is loose or has Check the regeneration RTD and tighten fied time. Defaults are 350°F fallen out. if needed. (176.7°C) for 20 sec. P8 Regen Temperature Loop The return air RTD has failed. Replace the return air RTD. Break – The regeneration temperature is outside of the oper-The regeneration heater has failed. Check the heater fuses, and resistance ator entered deviation alarm across each leg of the process heater. band (see Regen Temperature Deviation passive alarm) and The regeneration RTD is loose or has Check the regeneration RTD and tighten the regeneration temperature fallen out. if needed. is not moving towards the set- point at a rate greater than specified. Default values are 36°F (2°C) over 20 sec. 6Troubleshooting Troubleshooting l 6-11 Passive Alarms Problem Possible cause P9 Process Dew Point (PM1 The hose or wiring connections to the Option) – The dew point has sensor block are loose or have fallen off. not fallen below the setpoint. If the dew point goes below Desiccant level low. the setpoint, the alarm should go away. . Note: The alarm is not active for the first 3 The desiccant may be contaminated. indexes Leaks in the process air stream. P10 Process Filter Clogged The process air filter is clogged. (Option) – The process filter differential pressure switch is tripped. P17 Conveying Demand Sensor is out of position. (MDC Option) - The demand sensor located at the material receiver has not been satisfied The conveying load time is too short. after 3 attempts. Conveying blower is not coming on. Hoses have come off or are loose in the convey...

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