Temperature And Alarm Connections; Ac High Voltage Aux. Relay Output Wiring - Delta Electronics MCS-1800 Installation, Operation And Maintenance Manual

2. While connecting the battery cables inside the distribution module, make sure the system
3. The system voltage (rectifier output voltage) is –48VDC. Connect the positive battery

6.7 Temperature and Alarm Connections

6.7.1 Battery Temperature Sensors
One (1) battery sensor cable is provided with each system. The connection method please refers to
section 5.4.
6.7.2 External Alarm Connections
1. Table 21 Alarm Terminal Block Pin Assignments
Alarm
ACF
MAJ
HVSD
HV
LV
LVD
FA
MIN
2. Each alarm connection is provided with a normally close relay contact. This contact is capable of
carrying 0.5 Amp DC at 30VDC on a continuous basis.
3. Warning: All external circuits connected to these alarm relay terminals must be secondary and
6.8 Connect the PDU signal cables to the rear of the shelf which are mark "EXT. Breaker trip
signal I/P" connector.
The "FUSE ALM" LED on the front panel of ALU will light up when the breaker open.

6.9 AC High Voltage Aux. Relay output wiring

The connection point of "AC High Voltage Trigger Relay" which is on the rear of shelf will close when the
AC input voltage is higher than the setting value normally it's open.
is completely disenergized (that is, the AC lines are turned off and the battery cables are
disconnected at the battery end).
cable(s) to the BATT + and connect the negative battery cable(s) to the BATT -.
Description
AC Fail
Major
High Voltage Shutdown
High Voltage Alarm
Low Voltage Alarm
Low Voltage Disconnect
Fuse Alarm
Minor
properly isolated from the incoming line.
DELTA MCS-180 3U 0 Power Shelf
6-2
Installation, Operations and
Maintenance Manual