DSP-OHMNI Instruction Manual I-GARD
17
6.4.2 Pulsing Frequency
Press ENTER when the selection is chosen. The cursor will then move to the FREQuency position.
Press pq to select a pulse frequency from 0 to 9 with frequency increasing with the number selected.
It is not important to know exactly the frequency selected, however, Table 6.1. Indicates the frequency
for each setting.
TABLE 6.1 PULSING FREQUENCY SELECTION
Select 0 123456789
Freq Hz. 1.0 1.25 1.50 1.75 .2.00 .2.25 2.50 2.75 3.00 3.25
6.4.3 Interlock
Press ENTER after a value has been selected and the cursor moves to the interLOCK position. The
interlock prevents pulsing from occurring when there is no fault on the system. Press t to toggle ON or
OFF and then ENTER to complete the Pulse set-up.
6.5 Alarm Relay
For the next Setup the user will then be presented with the option to change the operation of the MUTE
function. The MUTE button normally disables the Alarm Relay and the local Beeper Alarm when pressed
to following a fault. However, the designer might use the Alarm Relay for some other function, for example
another contactor or cooling fan operation of the grounding resistors. In this case it is undesirable to MUTE
the relay. For this reason the operator may choose to disallow the MUTE button to change the state of
the Alarm Relay. The Screen of Figure 6.12 is presented.
ALARM RELAY Y/N
Figure 6.12 Alarm relay Setup
Selection of ‘Y’ provides the option selection screen of Figure 6.13.
MUTE ALARM RLY
— ENABLED
Figure 6.13 Alarm relay Options
The default is with the Alarm Relay MUTE control Enabled to allow Silence control of an external Horn system.
Pressing — button will toggle the ENABLED to DISABLED to defeat the MUTE switch operation of the Alarm
Relay and allow it to be used for other purposes which depend on whether or not the system is in a Faulted
condition.
NOTE: This does not affect the local Beeper function which will still continue to be MUTEd by the MUTE button.
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