Emerson Liebert APM 90 User Manual page 69

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.
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.
Pin No.
Pin 1 Va, power output
Pin 14 K0_NO, Channel 0 dry contact normally open output contact
Pin 2 K0_COM, Channel 0 dry contact common output contact
Pin 15 K0_NC, Channel 0 dry contact normally closed output contact
Pin 3 K1_NO, Channel 1 dry contact normally open output contact
Pin 16 K1_COM, Channel 1 dry contact common output contact
Pin 4 K1_NC, Channel 1 dry contact normally closed output contact
Pin 17 K2_NO, Channel 2 dry contact normally open output contact
Pin 5 K2_COM, Channel 2 dry contact common output contact
Pin 18 K2_NC, Channel 2 dry contact normally closed output contact
Pin 6 K3_NO, Channel 3 dry contact normally open output contact
Pin 19 K3_COM, Channel 3 dry contact common output contact
Pin 7 K3_NC, Channel 3 dry contact normally closed output contact
Pin 24 DRY_IN2, Channel 2 dry contact signal input
Pin 12 DRY_IN1, Channel 1 dry contact signal input
Pin 25 DRY_IN0, Channel 0 dry contact signal input
Pin 9 RXD_PC, for communication to PC, receive terminal
Pin 21 TXD_PC, for communication to PC, send terminal
Pin 13 GND, 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.
DIP switch DIP switch
Figure 8-2 Relay card appearance
Table 8-2 DB25 connector pin description
Pin name
Liebert APM 90 Integrated Modular UPS User Manual
Chapter 8 Option
DB25 connector
DB25 connector
Description
9 ~ 15Vdc (reserved for factory use)
Closed: UPS on Battery
Open: UPS on battery
Closed: Battery Low
Open: Battery Low
Closed: UPS on Bypass or in
Standby
Open: UPS on Bypass or in
Standby
Closed: UPS Faulty
Open: UPS Faulty
Reserved
The UPS is turned off if this contact is
closed for more than one second
The UPS is turned on if this contact is closed
for more than one second
Reserved, for factory commissioning
Reserved, for factory commissioning
Power GND, dry contact signal input
common GND
57
Electrical
parameter:
30Vdc/1.8A,
resistive
load