Operating instructions

Only qualified personnel can install the transmitter.
3.4 Fail Mode Alarm:
Taco Smart Pressure Transmitter automatically and continuously
performs self-diagnostic test. If the self-diagnostic test detects a
failure, the transmitter drives the output outside of the normal
operation values. The transmitter will drive its output low (down)
or high (up) based on the position of the failure mode alarm
jumper. See Table 1 for output values.
Avoid contact with the leads and terminals. High voltage, that may
be present on leads can cause electrical shock.
Fail Safe mode can be set via Jumper switches provided on the
LCD module or the main CPU module. The jumper switch for an
indicating transmitter, located on the LCD module, can be set to
the right (fail down, i.e. ≤ 3.75 mA) or left (fail up, i.e. ≥ 21.75 mA).
For non-indicating transmitters the jumper switch is located on
the main CPU module. It can be set up (fail up to ≥ 21.75 mA) or
down (fail down to ≤ 3.75 mA). Refer to Table 2 for detailed sum-
mary of jumper settings for both CPU and LCD modules.
Fail Safe Mode Selection (LCD and CPU Module)
1. WR_EN (EEPROM Write Enable)
DOWN: ENABLE
UP: DISABLE
2. Fail Mode (Alarm)
DOWN: LOW
UP: HIGH
3.5 EEPROM - Write Enable / Disable Mode Switch:
EEPROM (Electrically Erasable Programmable ROM), included on
the CPU module, is used by the transmitter to save/restore con-
figuration variables. To protect the transmitter from any unautho-
rized changes, a hardware lockout feature can be implemented by
using the Write-Protect mode jumper switch provided on the main
CPU Module. If the jumper switch is connected to DIS, this dis-
ables writing/changing of any data saved in the EEPROM. On the
other hand, if the jumper switch is set to “EN”, changes can be
made to the configuration data stored in the EEPROM. The factory
default setting is “EN” (Enable) for all transmitters. The location of
the Wire Protect Jumper Switch can be seen in Figure 4.
The 3100 has two security settings.
1. Security Jumper - the transmitter configuration parameters are
protected.
2. Physically removing Zero and Span Magnetic Buttons - you are
unable to regulate zero and span locally.
3.5.1 Security Jumper (EEPROM Write Protect):
Prevents the transmitter’s configured parameters from being
changed.
3.5.2 Zero and Span Buttons:
By removing the Magnetic Buttons, you can’t configure the trans-
mitter using the Zero and Span locally.
3.6 Configuration of Alarm and Security Jumper Procedures:
Changing jumper position:
1. If the transmitter is installed, cutoff power.
2. Open the front cover. If the transmitter is powered, don’t open
the cover.
3. Move the jumper to the preferred position.
4. Close the front housing covers. You must fully engage the cover
to meet explosion-proof requirements.
7
WARNING: Electrical shock can result in serious
injury.
Table 1: STANDARD ALARM AND SATURATION VALUES
LEVEL 4-20 mA SATURATION 4-20 mA ALARM
Low/Down 3.9 mA ≤ 3.75 mA
High/Up 20.87 mA ≥ 21.75 mA
WARNING: Electrical shock can result in serious
injury.
Table 2: CPU and LCD MODULE JUMPER SETTINGS
Select
Fail
Mode
Both LCD Module
and CPU Module
Only CPU
Module
CPU Module LCD Module CPU Module
Fail Down Down D D
Fail Up
Down U
U
Up U or D
Figure 1
Figure 2: Fail Mode and EEPROM - Write Selection Jumper Switch
Figure 3: Fail Mode Selection Jumper Switch for LCD Module
Fail Mode Select
Jumber Switch
Figure 4: CPU Module Fail Mode
EEPROM - Write Selection Jumper Switch
CPU Module
Jumber Switch
1) Fail Mode Selection