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THERMOCOUPLE INPUT
ALARM/TIMER RELAY WIRING

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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