Chapter 8 Option 57
Liebert APM 90 Integrated Modular UPS User Manual
The relay card can provide four channels of relay digital signal output to the remote site. They are UPS on
Battery, Battery Low, UPS on Bypass or in Standby, UPS Faulty. Each dry contact signal output channel provides
both normally open and normally closed ports. The relay card can also receive three channels of digital signal
input, two of which control the UPS turn-on and turn-off respectively, the third is reserved.
Appearance and hardware description
The appearance of the relay card is shown in Figure 8-2.
DIP switch
DB25 connector
DIP switch
DB25 connector
Figure 8-2
Relay card appearance
The DIP switch is used to configure the UPS turn-on and turn-off signal input function of the relay card. The
DB25 connector provides dry contact signal input and output. The pins of the DB25 connector are described
in Table 8-2.
Table 8-2
DB25 connector pin description
Pin No.
Pin name
Description
Pin 1
Va, power output
9
~
15Vdc (reserved for factory use)
Pin 14
K0_NO, Channel 0 dry contact normally open output contact
Closed: UPS on Battery
Pin 2
K0_COM, Channel 0 dry contact common output contact
Pin 15
K0_NC, Channel 0 dry contact normally closed output contact
Open: UPS on battery
Pin 3
K1_NO, Channel 1 dry contact normally open output contact
Closed: Battery Low
Pin 16
K1_COM, Channel 1 dry contact common output contact
Pin 4
K1_NC, Channel 1 dry contact normally closed output contact
Open: Battery Low
Pin 17
K2_NO, Channel 2 dry contact normally open output contact
Closed: UPS on Bypass or in
Standby
Pin 5
K2_COM, Channel 2 dry contact common output contact
Pin 18
K2_NC, Channel 2 dry contact normally closed output contact
Open: UPS on Bypass or in
Standby
Pin 6
K3_NO, Channel 3 dry contact normally open output contact
Closed: UPS Faulty
Pin 19
K3_COM, Channel 3 dry contact common output contact
Pin 7
K3_NC, Channel 3 dry contact normally closed output contact
Open: UPS Faulty
Electrical
parameter:
30Vdc/1.8A,
resistive
load
Pin 24
DRY_IN2, Channel 2 dry contact signal input
Reserved
Pin 12
DRY_IN1, Channel 1 dry contact signal input
The UPS is turned off if this contact is
closed for more than one second
Pin 25
DRY_IN0, Channel 0 dry contact signal input
The UPS is turned on if this contact is closed
for more than one second
Pin 9
RXD_PC, for communication to PC, receive terminal
Reserved, for factory commissioning
Pin 21
TXD_PC, for communication to PC, send terminal
Reserved, for factory commissioning
Pin 13
GND, common GND
Power GND, dry contact signal input
common GND
Others NC
Cable options
Emerson provides three cable options to connect the DB25 connector of the relay card, to suit the user's
different requirements on the functions of the connector.
