APC ACRC103 Specifications download pdf (Page 48)

InRow RC Operation and Maintenance40

Alarms do not show

up on monitoring

equipment (Form C)

• 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 is providing power (+12 V or

+24 V) to the external equipment, verify that the

external equipment is <

50 mA.

• Test the external equipment by bypassing the

Form C.

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 then also use

the ground.

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.

• Ensure that the wire polarity is correct.

Using a DC voltmeter, test the signal with no

transmissions in progress: expect Pin 2 to be

greater than 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.

• Wrong baud rate • Verify the baud rate is correct.

• Wrong ID • Verify the ID is correct.

Cooling units are

not communicating

with each other

• A-Link CAN • Verify that the A-Link port of every cooling unit

has either two cables or one cable and a

terminator.

• Confirm that the A-Link cables are connected to

the A-Link ports and that a network cable is

connected to the network port.

Problem Possible Cause Corrective Action

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APC ACRC103 Specifications Page 48

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