GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Phase sequence and reverse
rotation protection
Compressor models DSH 090 to 184 incorporates
an internal reverse vent valve which will react
when the compressor is run in reverse and
will allow refrigerant to circulate through a
by-pass from the suction to the discharge.
Although reverse rotation is not destructive for
these models, it should be corrected as soon
as possible. Repeated reverse rotation over 24
hours may have negative impact on the bearings.
Reverse rotation will be obvious to the user as
soon as power is turned on: the compressor will
not build up pressure, the sound level will be
abnormally high and power consumption will be
minimal. If reverse rotation symptoms occur, shut
the compressor down and connect the phases
to their proper terminals. If reverse rotation is
not halted, the compressor will cycle off-on the
motor protection.
PTC overheat
Delay timer active (after PTC over temp.)
Appr. 1 second
40ms 40ms460ms 460ms
Appr. 1 second
920ms80ms
DSH240 to DSH485
Electrical data, connections and wiring
DSH090 to DSH184
Use a phase meter to establish the phase
orders and connect line phases L1, L2 and L3 to
terminals T1, T2 and T3, respectively.
Use a phase meter to establish the phase
orders and connect line phases L1, L2 and L3 to
terminals T1, T2 and T3, respectively.
Compressor models DSH 240 to 485 are delivered
with an electronic module which provides
protection against phase reversal and phase loss
at start-up.
The phase sequencing and phase loss monitoring
functions are active during a 5-sec window 1
second after compressor start-up (power on
L1-L2-L3).
Should one of these parameters be incorrect, the
relay would lock out (contact M1-M2 open). The
red LED on the module will show the following
blink code (except on DSH485-3):
The lockout may be cancelled by resetting the
power mains (disconnect L-N) for approximately
5 seconds.
For more detailed information see “ Instructions
for electronic module” FRCC.PI.031.
Compressor
start
Phase monitoring
0 1 s 6 s
Phase sequence module logic
In case of phase reverse error:
In case of phase loss error:
Appro. 760 ms
120 ms120 ms120 ms 400ms
Appr. 1second
500ms 500ms
of resetting the mains (L-N -disconnect) for
approximately 5 sec.
A red/green twin LED is visible on the module
(except on DSH485-3). A solid green LED denotes
a fault free condition. A blinking red LED indicates
an identifiable fault condition:
While not compulsory, an additional thermal
magnetic motor circuit breaker is still advisable
for either alarm or manual reset.
Then it must be set below MCC value (at max
operating current):
• When the motor temperature is too high,
then the internal PTC over temp. and module is
activated.
• When the current is too high the thermal
magnetic motor circuit breaker will trip before
the module activate therefore offering possibility
of manual reset.
19FRCC.PC.045.A7.02
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