APPLICATION GUIDELINES
22
FRCC.PC.007.B5.02
ELECTRICAL DATA, CONNECTIONS AND WIRING
The lockout may be cancelled by resetting the
power mains (disconnect L-N) for approximately
5 seconds.
Compressor models SH 240 to 380 are deliv-
ered with an electronic module which provides
protection against phase reversal and phase loss
at start-up. Apply the recommended wiring dia-
grams from section "Suggested wiring diagram
logic". The circuit should be thoroughly checked
in order to determine the cause of the phase
problem before re energizing the control circuit.
The phase sequencing and phase loss monitor-
ing functions are active during a 5-sec window 1
second after compressor start-up (power on L1-
L2-L3).
Vavg = Mean voltage of phases 1, 2, 3.
V1-2 = Voltage between phases 1 & 2.
V1-3 = Voltage between phases 1 & 3.
V2-3 = Voltage between phases 2 & 3.
| Vavg - V1-2 | + | Vavg - V1-3 | + | Vavg - V2-3 |
2 x Vavg
% voltage
imbalance
= x 100
The operating voltage limits are shown in the ta-
ble section "Motor voltage". The voltage applied
to the motor terminals must lie within these table
limits during both start-up and normal opera-
tions. The maximum allowable voltage imbalance
is 2%. Voltage imbalance causes high amperage
over one or several phases, which in turn leads to
overheating and possible motor damage. Voltage
imbalance is given by the formula:
Voltage imbalance
Compressor model SH180 incorporates an inter-
nal reverse vent valve which will react in the pres-
ence of reverse rotation and will allow refrigerant
to circulate through a by-pass from the suction
to the discharge. Although reverse rotation is not
destructive for the SH180, even over long periods
of time, it should be corrected as soon as possible.
If reverse rotation is not halted, the SH180 will cy-
cle off on the motor protection.
Compressor
start
Phase monitoring
0 1 s 6 s
Phase sequence module logic
Should one of these parameters be incorrect, the
relay would lock out (contact M1-M2 open). When
present, the led on the module will show the fol-
lowing blink code:
In case of phase reverse error:
In case of phase loss error:
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