MGE UPS Systems 4 - Manual (Page 13)

The transistor resistance is 27 ohms and the maximum current allowed is 140mA AC or DC with
ambient temperature of up to 40°C.
In order to get a "logic low" you have to limit the current to: logic low voltage required divided
by 27, logic low voltage = 0.5V. I max = 0.5/27=0.0185A=18mA.
If you intend to use other forms of communication, an optional Multi-slot Communication is available
that will convert the RS232 serial commands into the following formats:
◗ Ethernet, SNMP ◗ J-Bus/RS422 ◗ High voltage/current relay contacts
Figure 3b. Communication Ports (USB and RS232 serial port)
3H. Connecting the UPS to the Utility
Plug the AC line cord of the UPS module into an AC 2-pole, 3-wire grounded receptacle for models
3 and 4. There should be no other loads on this branch circuit. To do so may result in a circuit
overload. Refer to National Electrical Code (NEC) specifications for requirements in your area or
ask your electrician.
Table 3a. UPS Wiring Information Figure 3c. AC Line Cord of the Extended Battery
Model Plug Amp rating
3 L5-30 30
4 5-50 50
3I. Connecting the Loads
Utilize the receptacles on the rear of the UPS module to connect your critical loads. If you need
more, you may want to consider the addition of MGE's optional distribution extension.
Caution: Never plug a surge suppressor into the output of a UPS. Most UPSs do not
produce the proper output wave shape for surge suppressor use. Improper use and
resultant damage is not covered by warranty.
COM1 USB
SW4
Vdc In/Ue/Entrada
Vdc In/Ue/Entrada
Utilization en atmospher
Intended for use in a con
Utilización preuista en u
Do not disconnect under load
RS232
Serial Port
Slide
Switch
USB
Port
3—3
G
W
W
G
Vac In/Ue/Entrada
Vdc In/Ue/Entrada
CAUTION: Batte power is removed. Do
Refer to qualified serv
ATTENTION: Con deparition tanaion d entra
recharge à l'intérievr de l
144Vdc / 5 Amp hr. Continuous amps: 25
Utilization en atmosphere controlee
Intended for use in a controlled environment
Utilización preuista en un amblento controlado.
Do not disconnect under load