PT900-12 Monitor/Controller
Rev 2.0
11
AC or DC Power Input
A black terminal block is provided at the lower left corner inside the
enclosure. The connections on the terminal block are labeled
L N G
.
Connect the external 117VAC power to this terminal.
If the unit is powered by DC, connect 24 VDC supply to the 2 pin green
terminal labeled
DC power input
on the termination board.
Refer to figure 3 for the location of AC and DC terminals
Connecting Sensors to the Monitor
Three (3) pin screw type terminals are provided on the termination board
for remote sensor connection. The terminals are labeled as SENSOR and
each pin is identified as +,
-
, & E for sensor DC supply, ground, and
signal respectively. The DC is supplied to the sensor by the control
module. The supply is fused through a 2 amp miniature fuse on the
control module.
Each remote sensor should be connected by a 3 conductor shielded cable.
See figure 4 for remote sensor connection.
Alarm Wiring
Figure 4 shows a typical wiring diagram for connecting alarm devices to
relay contacts on the control module. Note that contacts are dry or
potential free contacts. Refer to the wiring details provided by the
manufacturer of alarm devices.
Figure 4 shows the wiring of alarm devices to the relay contacts of a
control module. Similar wiring procedure should be followed if the
auxiliary relay board is used to connect to the alarm devices. The
auxiliary relays interface board is located in lower right corner of the
termination board.
The auxiliary relay board is pre-wired at the factory and all jumpers on
JMP1 thru JMP-11 are installed. The jumpers are used to connect each
contact of the alarms (Low, Hi & Hi-Hi) to common auxiliary alarms.
Auxiliary relay will be energized if the corresponding alarm relay is
activated on any of the 12 control modules in the rack assembly.
Refer to figure 5.
