*
Figure 17: PTC Overheat
460 ms
1s*
40 ms
460 ms
40 ms
approx. 1 second
*
Figure 18: Delay timer active (after PTC over temp.)
1s*
80 ms
920 ms
approx. 1 second
Cp
Ph
0
1s
6s
St
Cp
Ph
St
Compressor
Phase monitoring
start
*
Figure 20: In case of phase reverse error
760 ms*
120 ms
400 ms
120 ms 120 ms
Approximate
*
Figure 21: In case of phase loss error:
1 s*
500 ms
500 ms
Approximate
Ω), a 5-minute time delay is activated. After this delay has elapsed, the relay is once again pulled in – i.e. contacts
M1-M2 are closed. The time delay may be cancelled by means of resetting the mains (L-N -disconnect) for
approximately 5 sec.
When present, the LED on module will lighten as follows in case of overheat:
Phase sequence and reverse rotation protection
Use a phase meter to establish the phase orders and connect line phases L1, L2 and L3 to terminals T1, T2 and T3,
respectively. The compressor will only operate properly in a single direction, and the motor is wound so that if the
connections are correct, the rotation will also be correct.
Compressor model CH290 & CH485 are delivered with an electronic module which provides protection against
phase reversal and phase loss at start-up. Apply the recommended wiring diagrams 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 monitoring functions are active
during a 5-sec window 1 second after compressor start-up (power on L1-L2-L3).
Figure 19: Phase sequence module logic
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.
Scroll compressors, CH290 and CH485 | Electrical connections
© Danfoss | Climate Solutions | 2022.09
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