APC ACRD500 Installationshandbuch PDF herunterladen (Seite 55)

47InRow RD Operation and Maintenance

Alarms do not show

up on monitoring

equipment

(Customer Output

Contact)

• External monitoring

equipment is not receiving

power or is not functioning

properly

• Confirm that power, if required, is being supplied to the

external equipment.

• If the cooling unit (+12 V or +24 V) is providing power to

the external equipment, verify that the external equipment

is <

50 mA.

• Test the external equipment by bypassing the customer

output contact.

• Verify Customer Output Contact settings. See “Contacts”

on page 20.

Cooling unit does

not shut down on

command

• Drive voltage • Verify that there is a drive voltage entering the input of the

cooling unit. You may use the available +12 V or +24 V.

You must also use the ground.

• Verify Customer Input Contact settings. See “Contacts” on

page 20.

No communication

with building

management system

(BMS) port

• Improper connection • Confirm that the cooling unit is connected to the BMS port

and not to the Control port.

• Make sure that the wire polarity is correct. Using a DC

voltmeter, test the signal with no transmissions in progress.

Expect the voltage at pin 2 to be greater than at pin 1 by at

least 200 mV. Measure the cooling unit with the cable

disconnected, and then measure it again with the cable

connected. If the signal is less than 200 mV, the cooling

unit may be reverse-wired.

• Make sure that every cooling unit has either two sets of

wires in its connector or one set of wires and a terminating

resistor of 100 to 120 ohms.

Cooling units are

not communicating

with each other

• A-Link failure • Verify that the first and last cooling units have one cable

and a terminator.

• Verify that every other cooling unit has two cables.

• Confirm that the A-Link cables are connected to the A-Link

ports and that a network cable is connected to the network

port.

• Verify that the number of cooling units in the cooling group

matches the group number setting.

Output air is 17° C

(62° F) and fans are

running at a very

high rate of speed.

• Upper or lower supply air

sensor

• Either upper or lower supply air temperature sensor has a

fault. Verify that both supply air temperature sensors are

installed and working properly.

Problem Possible Cause Corrective Action

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