2.5 Noise considerations
All motor starters, contactors or any ot er inductive or noise generating devices s ould be mounted in eit er a
separate control panel or in a separate section of t e RBPC enclosure, at least 305 mm (12”) away.
W en t e RBPC is mounted in an enclosure or a control panel, use separate conduit entrances for low voltage
wiring and 120 V AC wiring.
2.6 Understandin the fault messa es (what to do?)
T e faults in t e RBPC are generated one at a time. If a fault occurs, t e fault as to be corrected first and t en it
as to be reset on t e main screen. T e faults are generated and stored like a deck of cards, one on top of anot er.
If multiple faults ave occurred t en once t e first fault is cleared t e next one will appear instantly after t e first. All
errors are saved in memory. If a power down occurs t ose same faults will re-appear t e next time t e control
powers up. Please refer to Appendix 1 in t e RBPC User’s Manual for a detailed listing and explanation of all faults
messages.
2.7 PLS Outputs
In order to cover a wider range of applications wit t e standard configuration, t e PLS outputs of t e RBPC are
factory equipped wit general purpose electromec anical relays. However, it is important to note t at t e service
life of electromec anical relays is inversely proportional to t e load current and to t e number of operations; t at is,
t e greater t e number of cycles t at an electromec anical relay is actuated and t e ig er t e current t roug its
contacts, t e s orter its service life.
T is wear mec anism can be particularly significant w en t e PLS outputs are programmed to operate at relatively
ig speeds (e.g. > 100 cycles per minute), as t ese operating conditions can lead to a premature failure of t e
relay w ic , ultimately, must be replaced.
To address t is problem, ISB recommends t e use of optional solid-state relays, w ic , aving no moving parts,
provide a longer lifetime and trouble free operation.
However, unlike t eir electromec anical counterparts, w ic can be used in a wider range of applications, solid-
state relays must be selected according to t e specific loading conditions (AC or DC, voltage and current) of eac
particular application. Please use t e information in t e table below to select and order optional ISB solid-state
relays:
ISB Part number Description
22 0240 00 Solid-state relay, AC output, 1 A @ 250 V AC (black colour)
22 0242 00 Solid-state relay, DC output, 1 A @ 60 V DC (red colour)
Please also note t at t e load ratings of t e solid-state relays is lower t an t e standard relays provided wit t e
RBPC.
⚠WARNING: Exceeding t e maximum ratings of t e solid-state relays may cause permanent damage
to t e device and may also lead to damage to t e internal circuitry of t e RBPC
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