Alpha Technologies Cordex 48-1kW 19 - Manual (Page 30)

Argus Technologies Ltd. 030-713-C0 Rev A WC
Printed in Canada. © 2008 Argus Technologies Ltd. ARGUS and CORDEX are trademarks of Argus Technologies Ltd. All Rights Reserved. Page 16 of 23
6.11.1 Alarm (Relay) Outputs
Terminals provide contacts for extending various alarm or control signals. Each relay output can be wired (jumper
selectable) for NO or NC operation during an alarm or control condition. See Figure 7.
Figure 7–Showing relay connections
Relays can be programmed to energize or de-energize during an alarm condition (see CXC Software manual).
When the CXCM reset button is pressed or power is lost, all relays de-energize. System Fail output relay (K0) is
fail-safe and will de-energize during an alarm condition.
These relays could be used for additional external LVD contactor control; however, this would not provide the
redundant LVD control as with the assigned output pins described below.
6.11.1.1 LVD Control
The LVD Control functions can be hardwired directly from the assigned output pins (+ and -) to
an external LVD contactor (or panel). See Controls Menu Defaults in the CXC Software manual.
Note: this connection is factory-equipped for List 86 and List 87.
Redundant LVD Control Circuit
The shelf backplane provides circuitry to override the LVD Control function. This is a safety
measure to protect against accidental load disconnect should the CXCM be removed from the
shelf. This protection is also necessary during CXCM reset.
The OUT voltage is 46V and the IN voltage is 51V. Ensure the CXCM LVD voltages are set
outside of this range. Note: controller Relay 1 must be set to ENERGIZED for the LVD to
operate properly.
6.11.1.2 System Fail Output
Terminals provide connections for a system (controller) fail relay. This fail-safe relay (i.e. it is de-
energized during an alarm condition) can be wired for NO or NC operation.
6.11.2 Digital Inputs
The digital input channels (factory-installed) are used to monitor various alarm and control signals. All input
channels are voltage activated and accept a bipolar (i.e. negative or positive) DC signal directly.
6.11.2.1 Connection Method
Typical Argus systems use the “reset with Hot and trigger with Ground” connection. The digital
input is wired in such a way that the Hot is wired directly into one of the input terminals; i.e.,
negative input for -48V systems. The other input terminal is wired to the Ground (common) of
the system through a relay (dry contact – usually located on the equipment requiring
monitoring). This method (see Figure 8) allows the digital input to receive (or not receive) a
Ground signal on an alarm.