Watlow Series SD31 PID with Optional Countdown Timer Manual de usuario Pagina 22
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Watlow Series SD31 ■ 20 ■ Chapter 4 Home
Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.
* Low numbers contain the two lower bytes; high numbers contain the two higher bytes of the four-byte integer.
Decimal precision is set in another parameter.
Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.
[rP;tg]
Ramp Target Set Point
The target set point for the ramp that is
in process appears in the display after
this prompt appears.
Set Point Low Limit
[SP;Lo]
to Set Point High
Limit
[SP;hi]
NA
Same as
Closed
Loop Set
Point
Controller is ramping.
[Er;In]
Input Error
Indicate an input error state.
None (0)
[----]
Error (1)
NA
24 R
There is an analog in-
put error.
[A1;Lo]
Alarm Low 1 Status
Indicate a low alarm at output 1.
None (0)
Alarm (1)
NA
29 R
There is an Alarm 1
low side alarm.
[A1;hi]
Alarm High 1 Status
Indicate a high alarm at output 1.
None (0)
Alarm (1)
NA
30 R
There is an Alarm 1
high side alarm.
[A2;Lo]
Alarm Low 2 Status
Indicate a low alarm at output 2.
None (0)
Alarm (1)
NA
31 R
There is an Alarm 2
low side alarm.
[A2;hi]
Alarm High 2 Status
Indicate a high alarm at output 2.
None (0)
Alarm (1)
NA
32 R
There is an Alarm 2
high side alarm.
Display Parameter Name
Description
Settings Range
(Integer values for Modbus
in parenthesis.)
Default Modbus*
(less 40,001
offset)
Read/Write
Appears if:
- User’s Manual 1
- Series SD31 1
- Single Display PID Controller 1
- Safety Information 2
- Technical Assistance 2
- Warranty 2
- Table of Contents 3
- Overview 4
- autotune 5
- Install and Wire 6
- Removing the SD31 Controller 7
- Wiring the Series SD31 8
- Figure 7b — RTD Input (100 9
- Figure 7c — 0 to 10V 9
- Figure 7d — 0 to 50mV 9
- 0 to 20 mA Process Input 10
- Output 1 Mechanical Relay 10
- Output 1 Solid-state Relay 10
- Output 1 Switched DC 11
- Output 1 Process 11
- Output 2 Mechanical Relay 11
- Output 2 Solid-state Relay 12
- Output 2 Switched DC 12
- Output 2 EIA/TIA-485 12
- 12VÎ (dc) 13
- Ethernet Gateway 14
- Home Page Overview 17
- ;ht] Rate Heat 18
- Setup Page Overview 19
- Factory Page Overview 20
- Programming Page Overview 20
- Read/Write 21
- Offset the input reading 31
- Programming Page Example 37
- Countdown Timer 38
- • SP is used when not timing 40
- Timer Example 44
- Calibrating the Series SD31 48
- Process Output Procedures 49
- Restoring Factory Calibration 49
- Features 50
- Operations Page 51
- Autotuning 51
- IS1 IS2 IS3 IS4 52
- 123 456 789 258 52
- Filter Time Constant 53
- Sensor Selection 53
- Access Lockout 53
- High Scale and Low Scale 53
- Control Methods 54
- On-Off Control 55
- Proportional Control 55
- (PID) Control 56
- Dead Band 56
- Nonlinear output curve 57
- Independent Heat and Cool PID 57
- Variable Time Base 57
- Process or Deviation Alarms 58
- Alarm Set Points 58
- Alarm Hysteresis 59
- Alarm Latching 59
- Alarm Silencing 59
- Retransmit 59
- Communications 60
- Troubleshooting 62
- Error Messages 64
- Appendix 65
- Power Supply H or L 67
- Output 1 C, K, F or J 67
- Output 2 A, C, K, J or U 67
- Timer Option A or T 67
- Prompt Index 70
- Series SD 71
- How to Reach Us 72
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