60 RTAA-SVX01A-EN
Installation — Electrical
2. 2-10 VDC Voltage Source Input.
Set DIP Switch SW1-2 of Options Module 1U2 to “OFF”. Connect the voltage
source to terminals TB1-7 (+) and TB1-8 (-) of Options Module 1U2. CLS is
now based on the following equation:
CL Setpoint% = (VDC x 10) + 20
Sample values for CLS vs. VDC signals are shown in Table 15.
3. 4-20 mA Current Source Input.
Set DIP Switch SW1-2 of Options Module 1U2 to “ON”. Connect the current
source to terminals TB1-7 (+) and T131-8 (-) of Options Module 1U2. CLS is
now based on the following equation:
CL Setpoint% = (mA x 5) + 20
Sample values for CLS vs. mA signals are shown in Table 15.
NOTE: The negative terminal TB1-8 is referenced to the UCM chassis
ground. To assure correct operation, 2-10 VDC or 4-20 mA signals must be
isolated or “floating” with respect to the UCM chassis ground.
Optional Bidirectional Communications Link (BCL)
This option allows the Clear Language Display in the control panel to
exchange information (eg. operating setpoints and Auto/Standby commands)
with a higher level control device, such as a Tracer, a multiple-machine
Table 15 Input Values Vs. External Current Limit Setpoint
Inputs
Resulting Chilled
Water Setpoint (%RLA)Resistance (Ohms) Current (ma) Voltage (Vdc)
49000 4.0 2.0 40
29000 6.0 3.0 50
19000 8.0 4.0 60
13000 10.0 5.0 70
9000 12.0 6.0 80
6143 14.0 7.0 90
4010 16.0 8.0 100
2333 18.0 9.0 110
1000 20.0 10.0 120
Minimum setpoint =
40% (2.0 VDC input)
Maximum setpoint =
120% (10.0 VDC input)
Maximum continuous input voltage = 15 VDC
Input impedance (SW1-1 on) = 40.1 Kohms
Minimum setpoint =
40% (0 mA)
Maximum setpoint =
120% (20.0 mA)
Maximum continuous input voltage =
30 mA
Input impedance (SW1-1 on) = 499 ohms
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