Carrier GTR040-420 Especificações descarregar pdf (Página 92)

APPENDIX C — Motormaster® V Configuration

Motormaster V (MMV) is a Variable Frequency Drive

(VFD) that varies the condenser fan speed. Within the MMV, a

reverse-acting, proportional-integral control loop is utilized to

maintain the liquid line pressure at a set point. The VFD will

vary the motor speed to drive the liquid line pressure to the set

point during ambient temperatures below 60 F.

The set point is lower than a normal operating pressure

during summer operation. At ambient temperatures above 60 F,

the fan will go to full speed (60 Hz or 50 Hz depending on

model) and remain there since it cannot go fast enough to bring

the pressure down to the set point. When the VFD is at full

speed, it acts just like a fixed speed fan. When the ambient air

temperature drops, a fan running at full speed draws too much

air across the condenser coil to maintain a minimum condens-

ing pressure/temperature. In these conditions, the VFD will

slow down and begin to maintain the set point.

Depending on the operating mode, the default set point for

R-22 is 135 psig on the liquid line. The default set point for

R-134a operation is 80 psig on the liquid line. The feedback

signal to this controller is a 0 to 5 VDC pressure transducer,

HK05YZ007 or equivalent, that is attached to a liquid line port.

Configuration —

The MMV is configured for 1 or 12

operation modes based on the inputs to the small terminal

block. The 30GTN,R units use operating modes 1-4 and

30GUN,R units use modes 9-12. In these configurations, the

MMV modulates the fan speed based on a 0 to 5V feedback

signal on pin 5. A “start” jumper wire is required to con-

figure the drive for 50/60 Hz operation and input voltage. A

“setpoint” jumper wire is used to toggle between R-22 and

R-134a set points for condensing pressure. See MMV Configu-

ration Table below for proper inputs. Once the drive is

powered, it will change to the mode selected according to the

inputs. No additional programming is required.

Motormaster V Configuration Table

*208-v can run in either mode (1 or 2, 9 or 10).

MODE NOM VOLTAGE Hz CONTROL INPUT (Pin 5) START JUMPER SETPOINT JUMPER

208/230/460/575* 60 Internal PI control, 0-5V feedback TB1-TB2 None

208/380* 60 Internal PI control, 0-5V feedback TB13A-TB2 None

230 50 Internal PI control, 0-5V feedback TB13B-TB2 None

380/415 50 Internal PI control, 0-5V feedback TB13C-TB2 None

208/230/460/575* 60 Internal PI control, 0-5V feedback TB1-TB2 TB12-TB2

208/380* 60 Internal PI control, 0-5V feedback TB13A-TB2 TB12-TB2

230 50 Internal PI control, 0-5V feedback TB13B-TB2 TB12-TB2

380/415 50 Internal PI control, 0-5V feedback TB13C-TB2 TB12-TB2

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 103 104

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Carrier GTR040-420 Especificações Página 92

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