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SECTION 4 - Description of the CR192 Micro-starting
and Protection Module
3. FCX -
Loading Relay. This relay picks up when the
motor is fully-synchronized and ready to be loaded. It is con-
trolled by the "FCX DELAY" programmable set-point.
4.2.4 Current transformer input
The fiSPM is designed to work from a five (5) ampere
Current Transformer (C. T) secondary. The Current Transformer
must be connected in the proper motor phase. (See Typical
Elementary Diagram on Figure 10 to determine proper phase.)
fiSPM for brush less applications require inputs from two motor
phases. See Figure 22.
4.2.5 Power factor analog signal output
This output is a zero to ten volts dc signal corresponding to
motor power factor. Zero volts is zero lagging power factor.
Five volts is unity power factor, and ten volts in zero leading
power factor. Calibration: one (1) volt change corresponds to a
phase shift of eighteen (18) degrees. (Not available with power
factor regulation.). Do not connect less than 10 kilo-ohms to
this output.
4.2.6 Optional inputs/outputs
The following are the optional inputs/outputs.
1.
DC Field Current Input. DC field input must be sensed
from a separately supplied D.C.C.T. (Direct Current, Current
Transformer) and C.M. (Calibration Module). These devices are
supplied automatically when field loss protection and/or the field
current display option is furnished.
Field Discharge
Voltage
Exciter Voltage
Field Current
Line Current
On/Off
Reduced
Voltage Start
Motor Trip lTRPl
Field Application FAR
Load Application FCX
Ana log
I n puts
Operator
Key
Pod
Relay
Outputs
2. Exciter Voltage Output Monitor. The output of the
field exciter must be connected to the fiSPM through a
separate resistor when exciter voltage failure protection and/or
exciter voltage display is furnished.
3.
Power Factor Regulation Output. This optional output
consists of a de control signal which is used to control an SCR
Variable Exciter output to obtain motor power factor regulation.
This pre-empts the power factor analog signal described in
Paragraph 4.2.5.
NOTE: The following paragraph applies to the
CR192 -E, and -F versions only.
If control voltage excursions occur outside the ranges
listed in paragraph 4.2.2., a provision is available that will
allow the user to connect an external stabilizing transformer
for operation with severe control power voltage dips. The
CR192 -E and -F versions have separate inputs for control
power and power factor reference voltage. This allows connec-
tion for control power from a stabilized voltage source of 115
VAC (CR192E), or 230 VAC (CR192F). Both of these versions
require a 6-7 VAC nominal input (unstabilized) for the power
factor reference voltage. Terminal points "V1 EXT" and
"GND" have been added to accommodate the separate PF
reference voltage. See Figure 31.
4.3 The CPU status light
The CPU status light is a bicolor type device. It should
normally glow green. If it is red continously, a problem exists
with the microprocessor or with a peripheral device. If the
Display
CPU
Status
Indication
ROM
Program
Memory
Electrically
Alterable
ROM
Motor
Parameters
Fai
I
Safe
(Watchdog)
Timer
Figure 20A. CR192 fiSPM block diagram
19
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