Dwyer 3100MP - Manual (Page 8)

Page 7
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 Figure 3-1 for detailed summary of
jumper settings for both CPU and LCD modules.
Fail Safe Mode Selection (LCD & 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
configuration variables. To protect the transmitter from any
unauthorized 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 disables 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 3-3.
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
transmitter 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.
U O O O O O O D O O O D
Select Fail
Mode
Fail
Down
Fail Up
CPU Module
Down
Down
Up
Both LCD Module and
CPU Module
LCD Module
D
U
U or D
Only CPU
Module
CPU Module
D
U
Fail Mode for LCD Module Selection Jumper Switch
Figure 3-1. Fail Mode and EEPROM-Write Selection Jumper Switch
(If Down) FAIL MODE (If Up)
Figure 3-2 Fail Mode Selection Jumper Switch for LCD Module
Figure 3-3. CPU Module Fail Mode, EEPROM-Write Selection Jumper Switch
UP
DOWN
Electrical shock can result in serious injury:
Avoid contact with the leads and terminals. High voltage, that
may be present, on leads can cause electrical shock.
WARNING