Installation
14 UDC3500 Universal Digital Controller Product Manual 3/07
Specifications
Current and Auxiliary
Outputs
Up to three Milliamp Outputs. These outputs provide a 0 to 21 mA current output into a
negative or positive grounded load or into a non-grounded load. Current outputs are isolated
from each other, line power, earth ground and all inputs. Outputs can easily be configured
via the keyboard to be 0 to 20 mA or 4 to 20 mA without field calibration and for either direct
or reverse action when used as a control output.
Any current output not being used as a control output can be used in an Auxiliary Output
mode. Auxiliary Outputs can be configured to represent any Analog Input, PV, Setpoint,
Deviation, or Control Output. The range of an Auxiliary Output can be scaled per the range
of the selected variable and can be set anywhere between 0 to 21 mA.
Resolution: 14 bits over 0 to 21 mA
Accuracy: 0.05% of full scale
Temperature Stability: 0.01% F.S./°C typical
Load Resistance: 0 to 1000 ohms
The First Current Output is a standard feature and is present on all instruments. The Second
Current Output is an option and is mutually exclusive with Ethernet Communications. The
Third Current Output is an option and is mutually exclusive with the other Output 2 Options
listed directly below.
Output 2 Options
Output 2 is a socket which may be populated with any one of the following output types:
Electromechanical Relay
SPDT contacts. Both Normally Open and Normally Closed contacts are brought out to the
rear terminals.
Resistive Load: 5 amps @ 120 Vac or 240 Vac or 30 Vdc
Inductive Load (cos
ϕ
= 0.4): 3 amps @ 130 Vac or 250 Vac
Inductive Load (L/R = 7 milliseconds): 3.5 amps @ 30 Vdc
Motor: 1/6 H.P.
Dual Electromechanical Relays
Two SPST relays. One Normally Open contact for each relay is brought out to the rear
terminals. This option must be used as the Loop 1 output for On-Off Duplex, Time Duplex,
Three Position Step Control and Position Proportional Control applications. Instruments with
this option can have a total of five relays plus one or two current outputs.
Resistive Load: 2 amps @ 120 Vac, 240 Vac or 30 Vdc
Inductive Load (cos
ϕ
= 0.4): 1 amp @ 130 Vac or 250 Vac
Inductive Load (L/R = 7 milliseconds): 1 amp @ 30 Vdc
Solid State Relay
SPST solid-state contact consisting of a triac N.O. output with zero-crossing detection.
Resistive Load: 1.0 amp @ 25°C ambient temperature and 120 or 240 Vac
0.5 amp @ 55°C ambient temperature and 120 or 240 Vac
Inductive Load: 50 VA @ 55°C ambient temperature and 120 or 240 Vac
Minimum Load: 20 milliamps
Open Collector Output
Transistor drive for powering an external relay. Isolated from earth ground and all other
circuits except the First Current Output. Internally powered @ 30 Vdc.
Note: Applying an external power supply to this output will damage the instrument.
Maximum Sink Current: 20 mA
Overload Protection: 100 mA
Third Current Output
See above.
Three Relay Board
(Optional)
Three SPDT contacts. Both Normally Open and Normally Closed contacts are brought out to
the rear terminals for each relay. These relays are used for Alarm outputs or for the output of
the second control loop. They may also be used as outputs for Logic Gate functions.
Resistive Load: 5 amps @ 120 Vac or 240 Vac or 30 Vdc
Inductive Load (cos
ϕ
= 0.4): 3 amps @ 130 Vac or 250 Vac
Inductive Load (L/R = 7 milliseconds): 3.5 amps @ 30 Vdc
Motor: 1/6 H.P.
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