14/1/98 Page 22 Issue H
7.5. DIP Switch Settings.
An internal 10 way DIP switch is located behind the front panel. The factory pre-set values of this
switch should not normally be changed. It can be accessed by withdrawing the relay from its case.
Using a suitable tool (Medium Duty Hook/Spike -RS Stock No 549-533) the switches can be moved
to carry out the following functions:-
DIP switch Action
1 Core balance CT Secondary = Relay Earth Fault Rating Then Setting =ON
Core balance CT Secondary = 1A with 5A Relay Earth Fault Rating
Then Setting =OFF
2 Phase sequence trip: on = enabled
3 Single phase: on - single-phase motor
4 Reserved
5 Comms test: on = hardware test active
6 Statistics reset: on = clear all stats data only (on powerup)
7 Stats & Params reset: on = clear stats and set defaults (except cal)
8 Lamp test: on = flash all LEDs with a blank display
9 Factory set.
10 Factory mode
DIP Switch No 1 select the sensitivity of the Earth Fault input and this is normally set during factory
calibration.
Phase sequence trip enables checking of the phase rotation at startup, sequence should be Ll, L2, L3.
Single-phase allows undercurrent trips on one phase (LI), in 3-phase use undercurrent is based on the
lowest of the 3 phase currents.
Comms test allows test of the hardware only, with no other equipment required. With this switch
enabled, the sync character ($5A) is transmitted at one-second intervals. With the PCB link in the
'Local echo' position, if the transmitted $5A is also received the 'RS' LED will light green. Removing
the link results in a red LED and moving the link to the 'DE' position (normal operating position)
also gives a red LED. Failure to receive correctly on local echo may be due to a fault in the
transmission, rather than the reception.
Statistics reset (on powerup) will clear down the following data: number of starts, hours run, thermal
capacity, start thermal, start time, trip currents/% load, trip record/last fault, starts since trip, and start
to trip time. No other defaults are altered.
Statistics & Parameters reset (on powerup) will clear down the above data, and reset all parameters
& settings to their defaults, except for the calibration settings.
Lamp test is used to check the operation and correct orientation of the 20 front panel LEDs, these are
flashed from green to orange.
Caution: DIP Switches 9 & 10 are for factory calibration only and should be left in the "OFF"
position.
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