Delta DTV4896C Valve Position Controller

The DTV series is Delta’s dedicated PID valve position controller for electric valves. Unlike conventional temperature controllers for heating/cooling loads, it is specially designed to drive modulating electric actuators with forward/reverse rotation. Dimensão do painel: 48×96mm (1/8 DE).

Definição de código de modelo

DTV: Delta Valve Controller series

4896: Panel size W48 × H96 mm

C: Saída de relé (C=Relay; R variant shares identical panel size with different contact rating/wiring)

Other models in this series include DTV9696C / DTV9696R (96×96 large panel)

Principais recursos

Valve-specialized PID: Equipped with two relay outputs for valve opening / valve closing to directly drive forward/reverse rotation of electric actuators. Real-time valve opening percentage display on panel. A/M auto/manual one-touch switching; valve opening can be fixed manually in manual mode.
Multi-input support

Termopar: K, J., T, E, N, R, S, B, Você, eu, TXK

Platinum RTD: Pt100, JPt100

Analógico: 4~~20mA, 0~~20mA, 0~~5V, 0~~10V

Alarme: 2 groups of alarm outputs with 17 alarm modes (limite alto/baixo, alarme de desvio, valve fault, etc.)
Comunicação: RS485 integrado, Modbus RTU/ASCII. Baud rate 2400~38400bps. Connectable to PLC and SCADA for PV/SV/valve opening and alarm status acquisition.
Fonte de energia: 100~240VAC 50/60Hz
Mostrar: LED duplo; PV in red, SV in green; ℃/℉ switchable
Sampling speed: 0.4s for thermocouple/RTD; 0.15s for analog input

Aplicações Típicas

Industrial kilns, heat exchangers, AVAC, textile dyeing, sistemas de água quente, closed-loop temperature control for electric regulating valves, constant temperature water supply/heating and furnace temperature regulation.

Difference from standard DTC/DTA temperature controllers

Standard temperature controllers: SSR/current output for heating loads.

DTV: Dual relay outputs to control forward/reverse motor of electric actuators, with valve-position PID dedicated to modulating valve opening.

Resumo da fiação

SAÍDA1: Valve open relay

SAÍDA2: Valve close relay

ALM1/ALM2: Alarm relays

RS485: D+, D-, Comunicação Modbus

Sensor input: Termopar / Pt100 / sinal analógico

Observação: DTV outputs are dry relay contacts only. They cannot power the actuator directly. The electric actuator requires external AC220V power supply.

Solução de problemas comuns

Valve no movement: Check ON/OFF operation of OUT1/OUT2 relays; actuator power supply and internal limit switches; improper PID P/I/D parameters.
Temperature oscillation: Perform PID auto-tuning; reduce proportional band P and increase integral time.
Falha de comunicação: Verify RS485 A/B wiring, station address, baud rate and parity.
Abnormal PV reading: Circuito aberto do sensor, mismatched input type, reversed wiring polarity.

Seleção Alternativa

Mesma série: DTV4896R (same panel size, contact rating difference, check datasheet)

Alternativa: If analog output (4~20mA) for electric valve is required, DTV cannot be used directly. Select DTA/DTB with analog output.

Delta DTV4896C Modbus RTU Register Map (Hex native address from manual)

Protocolo: Modbus RTU / ASCII, Escravo; Códigos de função: 03H Read Holding Registers, 06H Single Register Write, 01H Read Coils, 05H Force Single Coil

Unit definition: PV/SV = 0.1℃ / 0.1 scale; por exemplo. 250 = 25.0℃; Valve opening unit = 0.1%

⚠️ PLC/HMI commonly uses 40001 desvio: Physical address 1000H = HMI address 41001

Word Registers (03H / 06H)

Endereço(Hex)	Nome	R/W	Descrição
1000H	PV Process Value	R	Real-time temperature; Fault codes: 8002H Data acquisition failure /8003H Sensor break /8004H Wrong input type /8006H ADC fault /8007H Memory fault
1001H	SV Set Value	R/W	Temperature setpoint, 0.1 scale
1002H	Range Upper Limit	R	Max input range
1003H	Range Lower Limit	R	Min input range
1004H	Tipo de sensor	R/W	0=K,1=J,2=T,3=E,4=N,5=R,6=S,7=B,8=L,9=U, 10=TXK,11=JPt100,12=Pt100,13=0~5V, 14=0~10V,15=0~20mA,16=4~20mA
1005H	Modo de controle	R/W	0=PID；1=ON/OFF；2=Manual；3=Program PID；4=Ramp control
1006H	Heat/Cool	R/W	0 Aquecimento, 1 Resfriamento
1009H	PB Proportional Band	R/W	0.1~999.9
100AH	Ti Integral Time	R/W	0~9999
100BH	Td Derivative Time	R/W	0~9999
100CH	Integral Initial Value	R/W	0~1000 (0.1% unidade)
100DH	Proportional Compensation	R/W	Active when Ti=0, 0~1000 (0.1%)
1012H	Output Valve Opening	R/W	Unidade 0.1%; Writable only in manual mode, read-only in auto mode
1018H	Valve Full Close to Full Open Time	R/W	Valve stroke time, 0.1~999.9s; critical parameter for systems without valve position feedback
1019H	Valve Dead Band	R/W	Unidade 0.1%, suppress frequent valve chattering
101AH	Valve Feedback Upper Limit	R/W	For AI valve feedback: 0~1024
101BH	Valve Feedback Lower Limit	R/W	For AI valve feedback: 0~1024
101CH	PID Group Selection	R/W	0~4; 4=Auto PID match
101EH	Valve Output Upper Limit	R/W	0.1% unidade, maximum opening limit
101FC	Valve Output Lower Limit	R/W	0.1% unidade, minimum opening limit
1020H	ALM1 Alarm Mode	R/W	17 alarm modes
1021H	ALM2 Alarm Mode	R/W	17 alarm modes
1024H	ALM1 Upper Threshold	R/W	Alarme 1 limite
1025H	ALM1 Lower Threshold	R/W	Alarme 1 limite
1026H	ALM2 Upper Threshold	R/W	Alarme 2 limite
1027H	ALM2 Lower Threshold	R/W	Alarme 2 limite
102AH	Panel Status Word	R	Bit0:℉ Bit1:℃ Bit2:ALM2 Bit4:OUT1 Open Valve Bit5:OUT2 Close Valve Bit6:AT Auto-tuning Bit7:ALM1
102FC	Versão do Firmware	R	V1.00=0100H

Bit Coils (01H Read / 05H Write Coil)

Endereço(Hex)	Nome	R/W	Descrição
0810H	Communication Write Enable	R/W	0=Write disabled (padrão de fábrica), 1=Allow host PC parameter write
0811H	Temperature Unit	R/W	0=℉, 1=℃
0812H	Decimal Point	R/W	0/1; Not valid for B/R/S thermocouple
0813H	PID Auto-tuning AT	R/W	0 Parar, 1 Start AT
0814H	Control Run/Stop	R/W	0 Parar, 1 Correr
0815H	Program Control End	R/W	0 Correr, 1 Fim
0816H	Program Pause	R/W	0 Correr, 1 Pause
0817H	Valve Position Feedback Enable	R/W	0 No feedback, 1 AI valve feedback enabled
0818H	Valve Feedback Auto-calibration	R/W	0 Parar, 1 Start stroke auto-calibration (for valves with feedback)

Communication Basic Parameters (Set inside controller)

Endereço da estação: 1~247
Taxa de transmissão: 2400 / 4800 / 9600 /19200 /38400
Paridade: Fixed 8,N,1 (7E1/8O2 not supported)
Protocolo: Modbus RTU (Recomendado) / ASCII

Operation Examples (DVP PLC / IHM)

Read PV: Código de função 03, start address `1000H`, read 1 Word

Modify SV: Código de função 06, address `1001H`, write target value (por exemplo. 250 = 25.0℃)

Write valve opening in manual mode: First set `1005H` =2 (Manual mode), then write `1012H`; por exemplo. 500 = 50.0% abertura

Start PID auto-tuning: 05H write `0813H`=ON

Notas importantes

Before host writing parameters, 0810H must be set to 1 (communication write enable) otherwise write commands will fail. Set back to 0 after commissioning to prevent accidental modification.
DTV is a time-proportional valve position controller, NOT a 4~20mA analog output valve controller. Without valve feedback, valve opening is calculated based on【valve full-close to full-open time】.
For HMI with 40001 desvio: Physical address 1000H = decimal 4096 → HMI address 44097 (40001+4096)

Delta DTV4896C Fault Code List (PV register read via Modbus)

Observação: The DTV panel does not display hex fault codes directly. Fault codes are abnormal values read from PV register `1000H` by host system. Panel typically shows —- or EEE with ALM LED lit.

Código de falha(Hex)	Descrição	Solução de problemas & Remédio
8002H	Measurement not available / Input read timeout	1. Check loose or broken sensor wiring
		2. Inspect terminal oxidation or poor contact
		3. Confirm sensor type parameter matches field sensor
		4. Power cycle controller to eliminate transient interference
8003H	Sensor break (mais comum)	✅Thermocouple: Verifique a polaridade, circuito aberto;
		✅Pt100: One wire of 3-wire circuit broken;
		✅4~20mA analog: Loop open, no current;
		Test continuity, replace sensor or repair wiring
8004H	Wrong input type configuration	1. Verify【Sensor Type】parameter (1004H) matches actual sensor
		Exemplo: K-type sensor cannot be set to Pt100; 4~20mA cannot be set as thermocouple
		2. Entrada analógica: Internal jumper must be switched to current mode; wrong jumper will trigger 8004H
8006H	ADC analog-to-digital hardware fault	1. Power off for 5 minutes then restart to clear transient error
		2. Disconnect sensor, if fault persists with empty input terminals → ADC hardware damage, replace DTV unit
8007H	Memory fault (EEPROM error)	1. Try factory reset and reload parameters
		2. Ciclo de energia; if fault remains: storage chip damaged, replace controller

Local Panel Fault Indication (No Modbus required, visual check)

PV display —-: Circuito aberto do sensor, corresponds to 8003H
PV display EEE: Input out of range, sensor short circuit or wrong input type (8004H)
ALM LED ON but PV reading normal: Not input hardware fault. ALM1/ALM2 process alarm triggered (temperature limit, deviation or valve fault). Enter alarm menu to check alarm mode and threshold.

Valve Control Functional Faults (Not the above hardware fault codes, DTV specific)

DTV valve controller, valve no movement / frequent chattering, PV reading normal but abnormal valve action, not classified as 80xx hardware faults:

Valve no movement

Check ON/OFF of OUT1/OUT2 relay contacts with multimeter

Verify actuator AC220V supply and internal limit switches

Parâmetro:【Valve full close to full open time】1018H incorrectly set to zero will disable valve action

Valve chattering / frequent pulsing

Increase valve dead band (1019H, unidade 0.1%)

PID proportional band PB too small (overly aggressive P gain) causing oscillation; run AT auto-tuning

Mismatch between displayed valve opening and actual valve position (with AI feedback)

Enable valve feedback coil (0817H=1), start valve feedback auto-calibration (0818H=1), redefine stroke upper/lower limit 101AH/101BH

General Troubleshooting Workflow (Recommended sequence)

Power cycle to eliminate transient interference
Verify sensor wiring and sensor integrity
Confirm input type setting and hardware jumper (analog input must set jumper correctly)
Read PV register via host to confirm fault code
Software fault: Factory reset and reconfigure parameters; falha de hardware (8006/8007): Replace controller directly

Important Distinction for Alarms

80xx codes = Measurement input / hardware faults (PV cannot be read)

ALM1/ALM2 alarms = Process alarms (temperature limit, desvio, valve fault, PV acquisition normal). Do not confuse the two.

Model Coding Rule for full DTV series

DTV + Dimensão do painel + Tipo de saída

Dimensão do painel (2 opções)

4896: 48×96mm (1/8 DE, your current model)

9696: 96×96mm (1/4 DE)

Suffix code (Hardware output)

C: Saída de relé (OUT1 open, OUT2 close, relé duplo, mais comum, DTV4896C)

R: Basic relay (single channel valve relay)

eu: Saída de corrente linear (4~20mA for analog electric actuators)

V: Voltage pulse output (solid state pulse drive)

Unified power: AC100~240V; all models equipped with RS485 Modbus RTU/ASCII, dual alarm and valve PID control.

Complete DTV Model List (Mainstream available models)

1）48×96mm (DTV4896 series, slim vertical)

DTV4896C: Dual relay output (Abrir + Close valve), dedicated for electric valves (main model)
DTV4896R: Single relay output
DTV4896L: 4~20mA linear current output
DTV4896V: Voltage pulse solid-state output

2）96×96mm (DTV9696 series, square large display)

DTV9696C: Dual relay open/close valve (same logic as DTV4896C, only larger panel)
DTV9696R: Single relay
DTV9696L: 4~20mA linear current output
DTV9696V: Pulse voltage output

Universal input across all series: K/J/T/E/N/R/S/B/L/U/TXK thermocouple, Pt100/JPt100 RTD, 0~~5V/0~~10V/4~20mA analog input.

Model Suffix Comparison

Sufixo	Tipo de saída	Aplicativo	Matches your DTV4896C
C	Relé duplo (OUT1 Open, OUT2 Close)	Electric actuators with forward/reverse rotation	✅ Your model
R	Single relay	Single direction valve, simple on-off control	Alternative spare
eu	4~20mA analog signal	Modulating analog electric valves	Analog valve control
V	Voltage pulse	SSR solid state drive, contactless frequent operation	High frequency on-off control