Danfoss Turbocor TTS Series Applications And Installation Manual page 36

Figure 4-2 Modbus Grounding Diagram
Table 4-1 Control Wiring Details
I/O
COM (shield)
Modbus RS-485
NetB/NetA
Stepper Motor 1 Phase
1A, 1B, 2A, 2B, and
Stepper Motor 2 Phase
1A, 1B, 2A, 2B
Level Sensor +15V
(Evaporator)
Sensor Signal
(Evaporator)
Level Sensor +15V
(Economizer)
Sensor Signal
(Economizer)
Demand 0 - 10V
Interlock
Status
Liquid Temperature
Page 36 of 136 - M-AP-001-EN Rev. S 9/8/2021
Description
Shield for RS-485 communication.
Modbus over RS-485 communication port.
Optional output connections for controlling the main electronic expansion valve (evaporator) or auxiliary
electronic expansion valve (economizer or load balancing valve). 200ma Maximum output on each driver.
Valve frequency will effect operational characteristics.
Power supply for level sensor #1.
Input from a level sensor to control the main expansion valve (evaporator).
Power supply for level sensor #2.
Input from a level sensor to control the auxiliary expansion valve (economizer).
Analog input from customer-supplied controller to drive the compressor, i.e., 0 - max. kW input with a
deadband of 2VDC for the respective compressor model. Only available in 3.1.4; removed in 4.x forward.
Connects to a set of external normally closed contacts that typically open in the event of loss of chilled
water or air flow. Typically a 1.5VDC Output signal. NOTE: This is not a safety certified interlock.
An internal normally open contact that is closed during normal operation and opens in the event of a
compressor fault. With the circuit open, the compressor will not restart until the demand signal has been
reset to 0 (via chiller/unit controller). Circuit rated at 1A @ 30VDC/24VAC or .03A @ 120VAC.
Optional input for monitoring temperature. The temperature sensor must be an NTC type 10K @ 25°C