Maintenance
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11.2
AC Power Connections
Power connections may be disconnected from the UPS cabinet via a removable distribution box. This
may be a convenient feature if the UPS must be moved a short distance or replaced. This box allows
power connections to be conveniently disconnection from the main UPS cabinet. A label is attached to
the UPS to describe these procedures.
Hardwire and Hardwire/Receptacle boxes that include a Manual Bypass Switch allow AC power to
continue to flow from the mains input to the load while the box is removed from the UPS.
11.2.1 S4KPAD-CEHW-MBS - Manual Bypass Switch
Disconnect
1. DO NOT turn off the branch circuit breaker feeding power the box unless you intend to disconnect
all power to the load.
2. Ensure that the Maintenance Bypass Lamp is ON.
3. Switch to the maintenance bypass position.
The Load is now unprotected from line disturbances or interruptions.
4. Turn off the UPS using the front panel controls.
a. If needed, push the OFF button for one second once to transfer the load to bypass.
b. Press the OFF button twice within four seconds to turn the UPS off.
5. Turn off the UPS input circuit breaker on the box at the rear of the UPS.
This input circuit breaker only cuts power to the connector between the box and UPS. The input
circuit breaker does not cut power to the manual bypass switch.
6. Turn off the output circuit breaker on the rear of the UPS.
7. Remove the distribution box from the UPS
a. Loosen all three captive screws until box releases.
b. Pull box away from the UPS and set the box aside on a padded surface.
Reconnect
1. Align connectors and press the box onto the rear of the UPS.
2. Hold the box firmly against the UPS and tighten the captive screws. Do not overtighten.
3. If the Mains branch circuit breaker and load is off, turn the branch breaker on now.
4. Turn on the output circuit breaker on the rear of the UPS.
5. Turn on the input circuit breaker on the box.
6. Start the UPS according to the startup instructions.
Press the ON button for one second.
7. Confirm that the UPS AVAILABLE lamp is lit beside the manual bypass switch.
8. Turn the manual bypass switch to the UPS position.
9. The UPS now protects the load.
!
CAUTION
Power is still passing through the box from mains to the load.
!
VORSICHT
Es fließt noch Netzstrom durch den Kasten zu den angeschlossenen
Geräten.
