Operation
Liebert
®
eXM
™
64
7.7 De-Energize Liebert eXM Without Maintenance Bypass Cabinet
NOTICE
Risk of loss of power to the critical load. Can cause equipment damage.
This procedure will remove power from the critical bus. Take precautions by providing a
backup power supply or shutting down equipment before de-energizing the Liebert eXM.
To de-energize the Liebert eXM:
1. On the UPS control panel, press and hold the INVERTER OFF button for 2 seconds.
2. Open all battery circuit breakers(s) including the internal battery breaker (if applicable).
3. Open the UPS output circuit breaker(s).
4. Open the UPS input circuit breaker and bypass circuit breaker (dual input systems only).
5. Allow 5 minutes for all DC circuits and capacitors to fully discharge.
6. Use a digital multimeter to verify there is no AC or DC voltage present at the UPS input, output
and bypass bus bars.
Figure 39 Typical configuration for single UPS
7.8 Emergency Shutdown With EPO
This circuit has been designed to switch Off the UPS in emergency conditions (e.g., fire, flood, etc.).
The system will turn Off the rectifier, inverter and stop powering the load immediately (including the
inverter and bypass), and the battery stops charging or discharging.
If the input utility is present, the UPS’s controls will remain active; however, the output will be
turned Off. To remove all power from the UPS, the external feeder breaker should be opened. (Refer
to Figure 26).
Notes:
1. Install in accordance with national and local electrical codes.
2. Input and bypass must share the same single source.
3. A neutral is required from the system AC input source. Emerson recommends
a full-capacity neutral conductor and grounding conductors.
4. Bypass and rectifier inputs and output cables must be run in separate conduits.
5. Control wiring must be run in separate conduits.
6. Customer must supply shunt trip breakers with 120V coils to the bypass
and rectifier inputs.
* Bypass
AC Input
4 Wire + GND
See Note 6
* Rectifier
AC Input
4 Wire + GND
See Note 6
AC Output
208V
4 Wire + GND
Static Bypass
Field-Supplied Wiring
BATTERY
UPS
* External Overcurrent Protection By Others
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