DSP-OHMNI Instruction Manual I-GARD
11
Most of the screen navigation is done with the
u
key on the faceplate label of the DSP-DM. Pressing this
key once will switch screens to the System Status screen which shows the total system leakage IG. This
is derived from voltage measurement of the system voltages and is proportional to the current through the
grounding resistor of the system. It should
appear
as in Figure 5.1. This is the Home Screen, Screen1, which
is the
NORMAL starting screen after RESET is pressed. Various messages may modify this screen following
an
event such as a fault, loss of fuse, or during pulsing to provide some diagnostic information.
6
SETUP
On a new installation some simple set-up is required with at least Maximum System Current (NGR set-up)
and Feeder Modules being set prior to use of the equipment. Optional settings are Communications and
Pulse Control.
6.1 Communications
To enter the Set-Up Mode press SETUP when the Home
S
creen or Alarm Screen is showing (SETUP
will not enter from any other screens
)
. If confused at any point, press RESET and the Home
S
creen (or
Alarm
S
creen - if a fault has occurred) will be shown. Figure 6.1 shows the first set-up screen that will be
encountered – COMMS set-up mode.
SETUP COMMS? Y/N
Figure 6.1 Communications Set-up
If you are not using the RS-485 connection, then press
ENTER
to skip to the next set-up, otherwise press
t
to move the flashing cursor to select Y (for Yes) and press
ENTER
. The communications screen will
appear similar to Figure 6.2. The screen will show the set-up presently in use, or the default as shown.
MODBUS
1/D
01
BAUD RATE
4800
Figure 6.2 Communications Set-up
The DSP system must be identified by a number from 01 to 32, to distinguish between it and other
MODBUS devices that may be connected on the same RS-485 network. If only one device is used then it
will typically be set to 01, which is the default value. (Ensure that no other device has the same I/D setting
on the RS-485 network or data will not be valid). To change the number, use the
pq
arrows to increase/
decrease the digit under the flashing cursor and
ut
to change digits.
