Chapter 2 Installation
Power Supply
2-2
TC8927 Rev 1.0 User Manual
2.4
Power Supply
The TC8927 can be powered by external DC power. Available
power options are 12 VDC, 24 VDC, -48 VDC, and 125 VDC.
There are two terminal block connectors labeled "PWR A" and
"PWR B" only one is required to power up the unit. Since each
TC8927 card is equipped with a power redundancy capability,
the power LEDs on the front panel will light according to
which power jack (A or B) is connected. Both LEDs will light when power
redundancy is utilized.
2.5
Dry Contact Alarm Relay (DCAR)
A terminal block connector at the rear panel provides for the Dry Contact Alarm
Relay. This relay can be used in NO (Normal Open) or NC (Normal Close)
configuration.
When used in NO (Normal Open) configuration, the relay will close if the unit loses
power completely or the Alarm is on. The relay remains open during normal
operation.
When used in NC (Normal Close) configuration, the relay will open if the unit loses
power completely or the Alarm is on. The relay remains close during normal
operation.
2.6
System Start Up
Apply the power by plugging the power plug into a power jack (both PWR A &
PWR B for dual power units).
After power is applied, all LEDs (except PWR & VCC LEDs) will flash
momentarily and the following LED status should be observed from the front and
back panels:
1.
The Power "A" and/or "B" and VCC LEDs should be lit.
2.7
System Configuration
The TC8927 has been pre-tested and switches have been set per factory
specifications.
Important
Read and only connect a supply voltage that corresponds to the
type plate of your device. Make sure that the contact load capacity
of the signal contact is not exceeded.
