WIRING FOR SOLID STATE RELAY OUTPUT AND/OR SECONDARY OUTPUT

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 955-257 1.10 PROCESS INPUTS - DC VOLTAGE OR CURRENT INPUT Connect the +DC Input to terminal H and the -DC Input to terminal F (GND) for any current or voltage DC Input. The use of shielded twisted pair is recommended to minimize noise pick up. Never run signal input leads in the same bundle as supply or load lines. 1.11 WIRING FOR SOLID STATE RELAY OUTPUT AND/OR SECONDARY OUTPUT The PART NUMBER will specify which outputs are included in each unit. Since Solid State Relay and Analog Output use the same terminals only one type can be provided on each output. Output type is not changeable in the field. The standard Solid State Relay output is 1 ampere opto- isolated triac output. An optional 50 mA triac output may be supplied for either or both SSR outputs (SSR1 AND SSR2) Maximum voltage for SSR load is 240 VAC. See case label for type and rating of each output provided. Current limiting fuses such as Bussman KAA or KAB series or Gould Shamut form 101 Amptrap (1 AMP) are recommended to protect the 1 AMP Solid State Relay. APPLICATION NOTE: WHEN USING THE CONTROLLER SOLID STATE RELAY TO OPERATE AN EXTERNAL SOLID STATE RELAY OR SENSITIVE COIL RELAY TWO SITUATIONS MAY EXIST. 1. The leakage current in the 1 amp SSR may be sufficient to cause an external SSR to remain in the conducting state. To prevent this the 50 mA SSR option is recommended. 2. The low power draw of the external SSR may cause the controller SSR to turn OFF due to insufficient holding current. The solution to this is also to use the 50 mA SSR option. An alternate approach is to use a loading resistor across the external SSR or relay terminals to increase the current. ECLIPSE INSTRUMENTATION DIVISION page 3 - 1085

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