Precision Control Systems 1029C - Manual (Page 5)

MODEL 1029C 1 10/19/2007
DESCRIPTION
MODEL COVERED:
This manual describes the Control Concepts model 1029C controller with the following ratings:
CURRENT: 50 Amps to 750 Amps.
VOLTAGE: 120 Vac to 575 Vac. @ 50/60 Hz.
GENERAL DESCRIPTION:
The model 1029C is a single-phase, phase-angle power controller that has selectable feedback, dual command signals,
adjustable current limiting & over-current trip, shorted SCR detection, estimated output voltage metering and output
current metering.
FEATURES
CURRENT LIMITING:
A user adjustable setting prevents the load current from exceeding a presettable value. This feature is useful where
variable resistance loads have a heavy current draw as they are warming up.
OVER CURRENT TRIP:
If the SCR current exceeds this preset value, a relay with form C contacts is energized, an LED is lighted and the SCR's
are prevented from turning on. This provides a means to initiate an alarm or to remove system power in the event that
excessive current occurs. Momentary closure of a remote switch or momentary interruption of main power will reset the
O.C.T. circuit.
SOFT START AND MISSING CYCLE DETECTION:
The output voltage is ramped from zero to the desired output at a ramp rate equivalent to a time constant of 0.2 seconds
on power interuptions of 1/2 cycle or more. This feature minimizes inrush currents when controlling variable resistance
loads or inductive coupled loads.
SHORTED SCR DETECTION:
A relay with form C contacts and an LED is energized in the event an SCR fails in the ON state. This provides a means to
initiate an alarm or to remove system power in the event an SCR fails in the "ON" state.
STATUS INDICATORS:
Command - Intensity of command indicator is proportional to the command signal and the “ON” time of the SCRs.
Load - The intensity of the load indicator is proportional to the load current.
Shorted SCR - When “ON”, an SCR has failed in the shorted mode.
Over Current Trip - When “ON” indicates that load current has exceeded the preset Over Current Trip level.
RUN OR IDLE INPUT SELECTION:
With this feature, either of two command signals can be selected by a remote switch. This allows the controller to be
conveniently switched from a "RUN" to an "IDLE" state, or from an "AUTOMATIC" to a "MANUAL" control.
CHOICE OF FEEDBACK:
The Average value of the load voltage, the RMS value of the load voltage or the RMS value of the load current can
be linearly controlled with respect to the command signal. The power (watts) applied to the load can also be linearly
controlled with respect to the command signal. (Power feedback is an option that must be factory installed.) The controller
will also accept external feedback signals of 0/5 Vdc or 100 uA representing other process parameters.
OUTPUT METERING:
A filtered 0/5 Vdc signal representing the load voltage and a 0/5 Vdc signal representing the load current are provided for
remote monitoring.