MPS Doc: M359_USER_MANUAL REV G January 17, 2010 Page 13 of 30
5.2.2. Off State.
When the M359 is OFF, the Input, the By-pass and the Output relays (see Figure 1) are
not energized and are in the position shown on Figure 1. In this mode all of the UPS
circuits are off and no power is presented on the AC Output connector J2. Please note
that since the Input relay is located on the secondary side of the Isolation Transformer
(see Figure 1), the Power Conditioner’s Input is always connected to the AC input on J1.
To turn the M359 Off via the front panel:
Turn Off (down) the PWR ON/OFF switch
(2). All front panel indicators should turn-off.
To turn the M359 Off via the Remote Switches
: Turn Off the RMT ON/OFF switch.
After a short delay, all front panel indicators should turn-off.
5.2.3.
By-Pass Mode.
This mode is used only when the UPS has an internal failure that prevents it from
providing the AC Output. In this mode the Input and Output relays (see figure 1) are in
the unenergized state (as shown on Figure 1), but the By-pass relay is closed providing
a direct path from the AC Input on J1, via the passive Power Conditioner to the AC
Output on J2. In the By-pass Mode, none of the active circuits of the UPS are
operating, hence the front panel indicators and the communication ports are all off.
To enter the By-Pass Mode via the front panel:
Turn down the Output UPS/By-Pass
switch (8) and the Input UPS/By-Pass switch (7). Turn On (if it is not all ready in the On
position) the PWR On/Off switch (2).
To enter the By-Pass Mode via the Remote Switches
: Set the RMT UPS/By-Pass
selector to By-Pass position and the RMT PWR ON/Off switch to On. (The PWR
ON/OFF switch (2) and the remote RMT ON/OFF switch should both be in the On
position.)
5.2.4. Stand-By Mode.
In this mode, all of the UPS circuits are active, except that the DC-to-AC inverter is
disabled and the Output relay (see figure 1) is in the unenergized state (no AC output).
This mode is used when AC Output is not desired, but other functions, like Battery
charging, are. This mode can be entered only from the front panel control.
To enter the Stand-by mode
: Turn down the Output UPS/BY-PASS switch (8) and turn
On the PWR ON/OFF switch (2). The front panel display should be active and the
OUTPUT STDBY yellow LED (18) will be on and the OUTPUT OK green LED (21) will
be off. The LOAD LEVEL Bar-graph will also be off.
5.2.5. UPS Test-Mode.
The UPS Test Mode is useful for testing the functionality of the UPS. In this mode the
Input relay (see figure 1) is unenergized and the AC Output is provided by battery
power. This mode can be entered only from the front panel control.
To enter the Test Mode
: turn On the PWR ON/OFF switch (2) and after the M359 has
turned on, turn down the Input UPS/BY-PASS switch (7). The AC Input is now
