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INM MTL SUM5 Rev 7
DRAFT - 09 June 2021 DRAFT - 09 June 2021
2.2.4 Input Isolation
All signal inputs are optically isolated for use in harsh electrical environments.
2.2.5 Bi-Polar Inputs
125v and 250v signal inputs are bi-polar and therefore capable of accepting AC or DC
voltages. 24 V and 48V are DC input only
2.2.6 Standard Input Version
The standard version uses a fully isolated +24VDC supply as a signal voltage, (fused
at 160mA), which can be fed via a normally open (N/O) or normally closed (N/C) eld
contact to trigger each alarm as required.
2.2.7 Optional Powered Input Versions
As an alternative Customer powered Inputs can be used:-
• Option A = 24VDC & 125VAC/DC or
• Option B = 48VDC & 250VAC/DC.
The signal supply voltage level must be specied at the time of order to ensure the
correct type alarm card is supplied.
2.2.8 Integral Pushbuttons
Four Integral tactile pushbuttons are provided as standard designated as Test, Mute, Ack,
(Acknowledge), and Reset.
2.2.9 Customer Terminals
Industry standard rising clamp terminals capable of accepting up to 2.5mm2 cable are
provided for customer use on the rear of the annunciator and each terminal is held
in place by retaining screws located at the top and bottom of each terminal block for
additional security.
WARNING !
Hazardous voltages may exist on the rear panel connections when connectors are
removed. Take care not to touch any exposed parts
Retaining Screws
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