R3-TC2
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8468 Rev.3 P. 35 / 37
CT INPUT
The Controller has two CT inputs (CT input 1, CT input 2) which are used to monitor the control outputs with clamp-on cur-
rent sensors, for alarm purposes.
CAUTION
The Controller can monitor the control outputs only in case of 12V pulse or open collector. These outputs
must be set for PID or heating-cooling PID control assigned with heating output or cooling output.
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CT SENSOR TYPE
ADDRESS
PARAMETER
RANGE
DEFAULT
+1216
CT input 1, CT sensor type
See the table below.
0
+1376
CT input 2, CT sensor type
SET VALUE
SENSOR MODEL
INPUT RANGE
0
CLSE-R5
0.0 − 5.0 A
1
CLSE-05
0.0 − 50.0 A
2
CLSE-10
0.0 − 100.0 A
3
CLSE-20
0.0 − 200.0 A
4
CLSE-40
0.0 − 400.0 A
5
CLSE-60
0.0 − 600.0 A
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OUTPUT ASSIGNMENT
ADDRESS
PARAMETER
RANGE
DEFAULT
+1217
CT input 1, Output assignment
See the table below.
0
+1377
CT input 2, Output assignment
SET VALUE
OUTPUT
0
Control output 1
1
Control output 2
2
Control output 3
3
Control output 4
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HEATER WIRE BREAK ALARM / SSR SHORTCIRCUIT FAILURE ALARM / OVERLOAD ALARM
The following three types of alarm are available using the CT inputs.
These alarms could be used independently or in combination.
For example, with a heater driven by an SSR, the heater wire break, the SSR shortcircuit failure and the overload can be all
detected and alerted.
Heater wire break alarm
Current flows through the load normally when the
control output is on. Current stops when the heater’s
wire breaks.
The Controller measures the current with a clamp-on
current sensor and triggers an alarm when it is below
the setpoint.
measuring current
control output ON
control output OFF
heater current
SSR shortcircuit failure
alarm
Current stop normally when the control output is off. Current flows through the load when the
SSR fails in the shortcircuit mode.
The Controller measures the current with a clamp-on current sensor and triggers an alarm when
it is above the setpoint.
Overload alarm
Regardless of the control status, the Controller continuously measures the current with a clamp-on
current sensor and triggers an alarm when it is above the setpoint.
CAUTION
Control output must be turned on for at the minimum of 110 milliseconds to detect a heater wire break;
must be turned off for at the minimum of 200 milliseconds to detect an SSR shortcircuit failure. If there
is no ON and/or OFF status longer than the minimum duration for one control cycle, the Controller can-
not measure current. Current display shows -0.1A (invalid measurement) and all related alarms are reset
except for those latched.
