Watlow CLS200 - Current Input Connections; Pulse Input Connections

CLS200 Series User’s Guide
Chapter 2: Installation
35
CH IN+
CH IN-
Device with
Voltage
Output
CH IN+
Device with
Voltage
Output
Sixteen-Loop Controller
Four-Loop or Eight-Loop Controller
Com
Figure 2.15 — Linear Voltage Signal Connections
Current Input Connections
This input type requires scaling resistors. Special input resistors installed at Watlow for analog
current signals are such that the controller sees a -10 to 60mV signal across its inputs for the loop.
CH IN+
CH IN-
Device with
Current
Output
CH IN+
Com/Ref Com
Device with
Current
Output
Sixteen-Loop Controller
Four-Loop or Eight-Loop Controller
Figure 2.16 — Linear Current Signal Connections
NOTE! When mixing current inputs with low-voltage inputs (thermocouples or voltage
inputs less than 1V) to a sixteen-loop controller, connect the current inputs to the IN+
and Ref Com terminals. If no low-voltage sensors are used, connect current inputs to the
IN+ and Com terminals on TB1.
Pulse Input Connections
The CLS200 can accept a pulse input of up to 2000Hz from a device such as an encoder. The
frequency of this input is scaled with user-set parameters. See Setup Loop Input Menu on page
74 and Example 3: A Pulse Encoder on page 161. This scaled value is the process variable for
loop 5 on a four-loop model, loop 9 on an eight-loop model or loop 17 on a sixteen-loop model.
The CLS200 can accommodate encoder signals up to 24VDC using a voltage divider or can
power encoders with the 5VDC from the TB50 or TB18. The following figures illustrate connecting
encoders. A pull-up resistor in the CLS200 allows open collector inputs to be used.