Vertiv™ NetSure™ +24 VDC to -48 VDC Converter System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
16
4.4
External Alarm, Reference, Monitoring and Control Connections
External alarm, reference, monitoring, and control connections are made to terminals of TB1 and TB2 located on the system interface
circuit card mounted on the inside of the main shelf’s front door. Refer to Figure 4.2 for location.
External FA/CBA Alarm Input: An external FA/CBA alarm signal can be connected to the system as described in the Expansion
Shelf(s) Interconnections section.
External Alarm Relays
External alarm relays are extended to terminal block TB1 located on the system interface circuit card. Low Input Voltage, Conv
Critical, and Conv Major relays are energized for normal operating conditions and de-energized for an alarm condition. Fuse / CB relay
is de-energized for normal operating conditions and energized for an alarm condition.
•
Low Input Voltage Alarm:
Alarms if the input voltage to the system falls to 20.5Vdc ±0.5Vdc. An open loop circuit is
provided between terminals 1 and 2 of TB1 and a close loop circuit is provided between terminals 2 and 3 of TB1 during an
alarm condition. Alarm clears and the Input Voltage OK indicator illuminates when input voltage reaches 22.5Vdc ±0.5Vdc.
•
Fuse / Circuit Breaker Alarm:
Alarms if any distribution fuse or circuit breaker opens. An open loop circuit is provided
between terminals 4 and 5 of TB1 and a close loop circuit is provided between terminals 5 and 6 of TB1 during an alarm
condition.
•
Converter Fail Critical Alarm:
Alarms if more than one converter module fails (or if only one converter module is installed in
the system and it fails). An open loop circuit is provided between terminals 7 and 8 of TB1 and a close loop circuit is provided
between terminals 8 and 9 of TB1 during an alarm condition. Alarm conditions are as stated in “Converter Fail Major Alarm”
below.
•
Converter Fail Major Alarm:
Alarms if one converter module fails. An open loop circuit is provided between terminals 10
and 11 of TB1 and a close loop circuit is provided between terminals 11 and 12 of TB1 during an alarm condition. Alarm
conditions are…
a)
A converter module reports a high voltage shutdown condition (HVSD).
b)
A converter module reports a fan failure.
c)
A converter module reports an EEPROM failure.
d)
A converter module reports a converter failure.
e)
A converter module reports a low input voltage condition.
f)
A converter module reports a high temperature condition.
g)
A converter module reports a thermal derating condition.
CAN Bus
•
An ACU+ can be connected to terminals 1 (CANL) and 2 (CANH) of TB2.
