CONTREX CX-1200 - Manual (Page 151)

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may indicate a loss of feedback. The encoder or encoder wiring could be at fault. If this occurs and
Fb EU/Tm (MP-06) displays a nonzero value, then check the feedback scaling and the value for Zero Speed
(CP-332). If the motor is not moving, the drive may not be enabled. Check the enable logic and wiring. If
the motor is not moving, it could also indicate that the CO_Sig signal is not getting to the drive. Check the
CO_Sig wiring. In addition, there could be physical restrictions to motion or there could be a malfunction in
the motor or the drive.
To further customize the alarms there are Control Parameters that you can use to make comparisons, which
are reflected in the PLC. The four Control Parameters that compare the value of a user-selected Monitor
Parameter to a user-entered Control Parameter value are:
Cmpr1 Val (CP-388)
Cmpr2 Val (CP-389)
Cmpr3 Val (CP-390)
Cmpr4 Val (CP-391)
There are also four Control Parameters that establish the type of comparison between the Monitor Parameter
and corresponding Control Parameter. These four Control Parameters are:
Cmpr1 Parm (CP-380)
Cmpr2 Parm (CP-381)
Cmpr3 Parm (CP-382)
Cmpr4 Parm (CP-383)
In addition, there are four Control Parameters that establish the constant value (or threshold) that acts as the
trigger point of comparison between the Monitor Parameter and corresponding comparison type. These four
Control Parameters are:
Cmpr1 Type (CP-384)
Cmpr2 Type (CP-385)
Cmpr3 Type (CP-386)
Cmpr4 Type (CP-387
Enter the parameter number of the Monitor Parameter that you need for comparison, into one of the four
“Cmprl Parm” Control Parameters listed above. Enter the comparison type into the corresponding “Cmpr1
Type ” parameter.
For a “less than” comparison, use the ‘>=’ compare type and use the compliment of the Cmpr Out PLC Bit in
your PLC program.
For a “less than” or “equal to” comparison, use the ‘>’ compare type with the NOT of the Cmpr PLC Bit in
your PLC program.
NOTE: The compare type also determines if the comparison is performed with the signed value or with the
magnitudes of the values (absolute values).
Enter the constant value (or threshold) that you want as the trigger point of the comparison into the
corresponding “Cmpr1 Val” parameter.
There are four PLC bits that establish the “truth” of the comparison between the three corresponding
parameters: Cmpr Parm, Cmpr1 Type and Cmpr Val. These four Control Parameters are:
Cmpr1 Out (Bit 60)
Cmpr2 Out (Bit 61)
Cmpr3 Out (Bit 62)
Cmpr4 Out (Bit 63)
The result of each comparison is reflected in the corresponding PLC Bit; “1” displayed in the corresponding
bit indicates that the result of the corresponding comparison is “true”. Otherwise, the bit is cleared (“0”).