Module Power and Miscellaneous I/O
RTHC-SVD01B-EN 83
13-7 c. Switch SW2
Switch SW2 is used to configure the External Current Limit Setpoint
input for either a 2-10VDC, or a 4- 20mA signal. For use of a 2-10 VDC
signal, set SW2-1 to “OFF”. For use of a 4-20 mA signal, set the SW2-
1 to “ON”. SW2-2 and 3 are not used.
13-7 d. Switch SW3
Switch SW3 is used to configure the External Chilled Water Setpoint
input for either a 2-10VDC, or a 4- 20 mA signal. For use of a 2-10
VDC signal, set SW3-1 to “OFF”. For use of a 4-20 mA signal, set the
SW3-1 to “ON”. SW3-2 is not used.
13-7 e. External Setpoint Inputs (4-20mA/2-10VDC)
The chiller setpoint source should always be set to LOCAL when using
any external inputs, except Tracer. When using Tracer, always set the
chiller setpoint source to the Tracer mode. The setpoint source can be
found in the Operator Settings Menu.
These inputs accept either an isolated 4-20 mA or 2-10 VDC signal
from an external controller or programming resistor connected to an
internal +5V source. The switches SW2-1 and SW3-1 are used to
select either the voltage or current option for External Current Limit
Setpoint and External Chilled Water Setpoint respectively. Refer to
tables 13-11 and 13-12.
Items that must be set in UCP2 are:
Located in Service Settings, Machine Configuration Group (+-+-+-):
J9-4, 5 External Chilled Water
Setpoint (Current or
voltage option)
Refer to External Setpoint Inputs
Unreferenced 2-10V or 4-20 mA Input (SW3-2)
J12-1, 2 Head Relief Request
Relay (N.O.)
Open: Normal operation
Closed: Operating mode of Condenser Limit
The contacts are rated for a max. of 250 VAC or 30 VDC.
J18-3,2,1 Tracer Controlled Relay This output contact is reserved for exclusive control
through Tracer communication
Table 13-9: Options Module Nominal Terminal Voltages (1U5)
Terminal
Designation
Description of Circuit Normal Terminal Voltages for Various Conditions
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