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| Installation |
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| Specifications |
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Controller Output | Electromechanical Relays (One or Two) |
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Types | SPDT contacts. Both Normally Open and Normally Closed contacts are brought out to the |
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| rear terminals. Internally socketed. |
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| Resistive Load: 5 amps @ 120 Vac or 240 Vac or 30 Vdc |
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| Inductive Load (cosϕ = 0.4): 3 amps @ 130 Vac or 250 Vac |
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| Inductive Load (L/R = 7 msec): 3.5 amps @ 30 Vdc |
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| Motor: 1/6 H.P. |
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| Dual Electromechanical Relays |
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| Two SPST contacts. One Normally Closed contact for each relay is brought out to the rear |
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| terminals. Useful for Time Duplex or Three Position Step control applications, this option |
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| takes the place of one of the above electromechanical relays, thus saving it for use as an |
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| alarm. Units with this output option may have two additional relays (total of four relays) plus |
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| the Second Current Output. Relays are internally socketed. |
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| Resistive Load: 2 amps @ 120 Vac, 240 Vac or 30 Vdc |
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| Inductive Load (cosϕ = 0.4): 1 amp @ 130 Vac or 250 Vac |
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| Inductive Load (L/R = 7 msec): 1 amp @ 30 Vdc |
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| Solid State Relays (One or Two) |
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| socketed. |
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| Resistive Load: 1.0 amp @ 25°C and 120 or 240 Vac, 0.5 amp @ 55°C and 120 or 240 Vac |
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| Inductive Load: 50 VA @ 120 Vac or 240 Vac |
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| Minimum Load: 20 milliamps |
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| Open Collector Outputs (One or Two) |
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| Socketed assembly replacing a relay. |
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| output and not from each other. Internally powered @ 30 Vdc. |
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| Note: Applying an external power supply to this output will damage the instrument. |
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| Maximum Sink Current: 20 mA |
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| Current Outputs (One or Two) |
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| These outputs provide a 21 mA dc maximum into a negative or positive grounded load or into |
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| and all inputs. Outputs can be easily configured via the keyboard for either direct or reverse |
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| action and for either 0 to 20 mA or 4 to 20 mA without field calibration. |
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| The second current output can be used in an Auxiliary Output mode. This Auxiliary Output |
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| can be configured to represent either Input, PV, Setpoint, Deviation, or Control output. The |
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| range of an Auxiliary Output can be scaled per the range of the selected variable and can be |
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| set anywhere between 0 to 21 mA. The Second Current Output is mutually exclusive with the |
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| second Digital Input. |
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| Resolution: 12 bits over 0 to 21 mA |
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| Accuracy: 0.05% of full scale |
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| Temperature Stability: 0.01% F.S./°C |
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| Load Resistance: 0 to 1000 ohms |
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Alarm Outputs | One SPDT Electromechanical relay. A second alarm is available if the second control relay |
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(Optional) | is not used for control purposes or when the Dual Relay Option is used. |
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| Up to four setpoints are independently set as high or low alarm, two for each relay. Setpoint |
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| can be on any Input, Process Variable, Deviation, Manual Mode, Failsafe, PV Rate, RSP |
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| Mode, Communication Shed, or Output. A single adjustable hysteresis of 0.0 to 100.0% is |
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| provided. The alarm can also be set as an ON or OFF event at the beginning of a Setpoint |
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| ramp/soak segment. |
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| Alarm Relay Contacts Rating: Resistive Load: 5 amps at 120 Vac or 240 Vac or 30 Vdc |
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Isolation (Functional) | Analog Inputs: are isolated from all other circuits at 850Vdc for 2 seconds, but not from each |
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| other. |
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| Analog Outputs: are isolated from all other circuits at 850Vdc for 2 seconds. |
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| AC Power: is electrically isolated from all other inputs and outputs to withstand a HIPOT |
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| potential of 1900Vdc for 2 seconds per Annex K of |
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| Relay Contacts: with a working voltage of 115/230 Vac, are isolated from each other and all |
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| other circuits at 345Vdc for 2 seconds. |
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4/07 | UDC2500 Universal Digital Controller Product Manual | 9 |
