030-803-J0 Rev B
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6.10 Signal Wiring Connections for CXCM4
The CXCM4 (specifications 018-586-B1) requires an adapter for modular installation (drawing 747-275-08).
NOTE:
To aid the user with installation, frequent reference is made to drawings located at the rear of this manual.
Custom configurations may be detailed within the Alpha power system documentation package.
For terminal block connections, the recommended wire sizes are 0.823 to 0.129mm
2
(#18 to #26 AWG) for the
temperature range of 0 to 50 deg. C (as per UL/CSA).
CAUTION: to reduce risk of fire, use only 0.129mm
2
(#26 AWG) or larger wire.
6.10.1 Alarm (Relay) Outputs
Terminals provide contacts for extending various alarm or control signals. Each relay output can be wired 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 CXCM4 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.
6.10.1.1 LVD Control (External Option)
The LVD Control functions can be hardwired directly from the assigned relay output to an
optional LVD override control and distribution alarm card. This provides a safety measure to
protect against load disconnect during CXCM4 reset or replacement (see Section 5.4); e.g.
when the controller is off-line. Operators may also perform test and maintenance procedures on
the CXCM4 without disturbing the load.
6.10.2 Digital Inputs for CXC
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.
6.10.2.1 Connection Method
Typical Alpha 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; e.g.,
positive input for +24V 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.
