77
48/50LC 07-26 Variable Frequency Drive (Dan-
foss VFD)
The indoor fan motor is controlled by a VFD. The supply fan
VFD is located in the supply fan section behind the access
door. The VFD varies the frequency of the AC voltage sup-
plied to the indoor fan. This allows the variation in the speed of
the fan. The VFD is always powered during normal operation
and the fan is stopped by driving the speed to 0. Figure 42 and
Table 37 show the VFD terminals and connections.
The VFD is factory-configured to match the current and power
requirements for each motor selection and all wiring connec-
tions are completed by the factory; no field adjustments are
necessary. The VFD used has soft start capabilities to slowly
ramp up the speeds, eliminating any high inrush of air volume
during speed changes. While the basic VFD retains all of its
standard capabilities, the 48/50LC unit uses only a limited por-
tion of these features to provide discrete output speeds to the
motor. The VFD is not equipped with a keypad. A keypad is
available as an accessory (P/N: CRDISKIT002A00) for field
installation or expanded service access to VFD parameter and
troubleshooting tables.
Fig. 42 — Variable Frequency Drive (VFD) Terminals
and Connections (Unit shown with front cover
removed)
Table 36 — 48/50LC 04-06 VFD Fault Codes
SYSTEMVU
FAULT
SYSTEMVU
ALERT
ABB ALARM
CODE
ALARM
DESCRIPTION
CAUSE OF PROBLEM AND CORRECTIVE ACTION
F613-IDF VFD
OVER CURRENT
A607-IDF VFD
CURRENT LIMIT
1 Over Current
Output current is excessive. Check for excessive motor load,
insufficient acceleration time (parameters 2202 ACCELER
TIME 1, default 30 seconds), or faulty motor, motor cables or
connections.
F617-IDF VFD
OVER VOLTAGE
A606-IDF VFD
VOLTAGE WARNING
2 DC Over Voltage
Intermediate circuit DC voltage is excessive. Check for static or
transient over voltages in the input power supply, insufficient
deceleration time (parameters 2203 DECELER TIME 1, default
30 seconds), or undersized brake chopper (if present).
F601-IDF VFD
UNEXPECTED
A605-IDF VFD
THERMAL WARNING
3 Device Over Temp
Drive heat sink is overheated. Temperature is at or above 115°C
(239°F). Check for fan failure, obstructions in the air flow, dirt or
dust coating on the heat sink, excessive ambient temperature, or
excessive motor load.
F618-IDF VFD
SHORT CIRCUIT
—4Short Circuit
Fault current. Check for short-circuit in the motor cable(s) or
motor or supply disturbances.
F616-IDF VFD
UNDER VOLTAGE
A606-IDF VFD
VOLTAGE WARNING
6 DC Under Volt
Intermediate circuit DC voltage is not sufficient. Check for missing
phase in the input power supply, blown fuse, or under voltage on
main circuit.
F614-IDF VFD
MOTOR OVER TEMP
A605-IDF VFD
THERMAL WARNING
9 Motor Over Temp
Motor is too hot, as estimated by the drive. Check for overloaded
motor. Adjust the parameters used for the estimate (3005 through
3009). Check the temperature sensors and Group 35 parameters.
F611-IDF VFD
EARTH FAULT
A608-IDF VFD
WARNING
16 Earth Fault
The load on the input power system is out of balance. Check for
faults in the motor or motor cable. Verify that motor cable does
not exceed maximum specified length.
F619-IDF VFD
MAIN PHASE LOSS
A608-IDF VFD
WARNING
22 Supply Phase
Ripple voltage in the DC link is too high. Check for missing main
phase or blown fuse.
TERMINALS
61, 68, 69
TERMINALS
18, 19, 27, 29
TERMINALS
12, 20, 55
TERMINALS
U, V, W
TERMINALS
L1, L2, L3
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