Quinny 65040-AB manual Network Voltage Tests on Power$ync II Systems, Network Setup

Section VIII - Power$ync II™ Operation

1B Boards - On 1B boards there is no dip switch to set. Only the termination jumper at J13 needs to be set. This should be in the ON position on the compressor at the end furthest from the network terminator power supply. This is the machine with only 1 cable entering. All other boards should have this jumper in the OFF position.

Network Voltage Tests on Power$ync II™ Systems

Voltage tests at J10 on the 140265-1QD board can be used to do a rough test on network connections.

The top connection should be approximately 2.5-2.9 volts when operation is normal. The lower connection should be about 1.9 volts. The voltage generally drops on the top connection if the terminator, the dip switch or the jumper are incorrect.

Always check the terminator power supply module to see if there is power present in its location and that the voltage output is present as listed on the nameplate.

NOTE

The power outlet for this terminator should be always powered, not tapped from the compressor supply. This is to keep the network properly terminated if one of the compressors is shut off for service.

The primary cause of network faults other than terminator settings, is the use of improper cable to connect the compressors. The wrong cable may work for short range connections, but will definitely not work over longer runs.

Network Setup

For applications that see very little demand change or applications that have demand changes that correspond to the full capacity of selected compressors, these compressors may be networked together.

There are nine positions available for machines in a network (see Compressor Settings and Maintenance Displays, pages 45-58). The unload and load pressure settings function much the same way that the pressure switch settings would in a purely mechanical, multi- machine controller.

There are nine possible electronic pressure switches that can be used to determine compressor load and unload settings. When setting up a sequence, remember that the first machine ID in the sequence will be assigned to the number one pressure setting. The next machine ID to the right will be assigned to the number two pressure setting. A two machine example of this can be easily illustrated as follows:

1>115U 110L 2>113U 108L 3>000U 000L 4>000U 000L 5>000U 000L 6>000U 000L 7>000U 000L 8>000U 000L 9>000U 000L

UP/DOWN DEADBAND, F1 EDIT, ENTER RETURN

The number one position pressure has been set to unload at 115 PSIG and load at 110 PSIG. The number two position has been set to unload at 113 PSIG and load at 108 PSIG. In the sequence ‘AB’, the ‘A’ machine would run at the 110 to 115 PSIG setting and the ‘B’ machine would run at the 108 to 113 PSIG setting. If the sequence were changed to ‘BA’, the ‘B’ machine would run at the 110 to 115 PSIG setting and the ‘A’ machine would run at the 108 to 113 PSIG setting. In order to rotate machines through different pressure settings, sequence changes must be programmed.

!WARNING

Do not set load pressures higher than the full load pressure rating of the compressor. Do not set unload pressures higher than the full load pressure rating of the compressor when compressors are set to run load/no load.

Quincy Compressor® - QSD™ 37