Functional description
810.00113.0 11/18
5 Functional description
5.1 Application information
5.2 Refill intervals
5.2.1 INT280 B
After the INT280 B is switched on, the alarm relay picks up after 3s, if no malfunction is present (closed-circuit
principle). Regardless of the oil level, a 20 second pause is activated to allow the oil to settle. If, thereafter, a too low
oil level is detected, the solenoid valve switches to oil injection in a specified cycle:
1st cycle: fill 5s / wait 5s,
2nd cycle: fill 10s / wait 10s,
3rd cycle: fill 20s / wait 20s...
If, after 135s, an adequate oil level has not been reached, the alarm relay drops out. The last filling cycle that has
been reached (fill approx. 30s and wait approx. 30s) stays active. If an adequate oil level has been reached, the
alarm relay picks up again after a waiting time, the filling cycle is reset.
If there is a device malfunction (e.g. low supply voltage), the alarm relay drops out and is locked, regardless of the
oil level, after approx. 5s. No filling procedure is performed.
The lock can be released by an open circuit of the voltage supply for at least 5s.
5.2.2 "INT280-xxx"
After the "INT280-xxx" is switched on, the alarm relay picks up after 3s, if no malfunction is present (closed-circuit
principle). Regardless of the oil level, a 2 second pause is activated, to allow the oil to settle. If, thereafter, a too low
oil level is detected, the solenoid valve switches to oil injection for the filling time (default 10s).
If the fill level has not been reached until then, the solenoid valve is switched off for the break time (default 20 % =
2s) and then switched back on for the filling time. This is continued until the fill level is reached.
If an adequate oil level has not been reached after the oil deficiency alarm delay has expired (default 120s), the alarm
relay drops out. Refilling oil is continued to be attempted. If an adequate oil level has been reached, the alarm relay
picks up again after a waiting time.
If there is a device malfunction (e.g. low supply voltage), the alarm relay drops out and is locked, regardless of the
oil level, after approx. 5s. No filling procedure is performed.
The "INT280-xxx" has its own monitoring system of the optical sensor. If there is a malfunction, the alarm relay is
locked and the error is signalled by the flash code.
If there is a soiling of the glass cone, this is signalled by the flash code when the warning threshold is exceeded. The
function continues to be ensured.
A cleaning should be carried out during the next general maintenance, see Chapter Cleaning.
If the soiling of the glass cone reaches a critical value, the compressor is switched off locked or the warning soiling
stage 2 is generated, depending on the setting.
The lock can be released by an open circuit of the voltage supply for at least 5s.
For proper operation, make sure that there is always enough oil in the oil reservoir and sufficient oil
pressure is available.
If there is a malfunction in the refrigeration circuit, in particular in cases where foreign particles, e.g.
soot, may get into the oil circuit, the oil and the corresponding filters need to be replaced. The oil
level regulator also needs to be replaced in case a cleaning of the prism of the oil level regulator
cannot be done.
The applications and the functional description are specified in the accompanying data sheet.
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