tekmar 662 Snow Detector & Melting Control - Manual (Page 11)

11
090 YELLOW SENSOR – SHORT CIRCUIT
Check the 090 yellow temperature sensor (black and yellow wires, terminals 19 &
21), and the wiring from the terminal plug to the sensor. When the control has this
error the melting system is shut down.
090 BROWN SENSOR (or SLAB SENSOR 072) – OPEN CIRCUIT
Check the wiring to the 090 brown temperature sensor (black and brown wires,
terminals 19 & 22) or the Slab Sensor 072 (terminals 19 & 22). When the control has
this error, the melting system is shut down.
090 BROWN SENSOR (or SLAB SENSOR 072) – SHORT CIRCUIT
Check the wiring to the 090 brown temperature sensor (black and brown wires,
terminals 19 & 22) or the Slab Sensor 072 (terminals 19 & 22). When the control has
this error, the melting system is shut down.
WATER DETECTION CIRCUIT – OPEN CIRCUIT
Check the 090 water detection circuit (black and blue wires, terminals
19 & 20) according to brochure D 090. When the control has this error, the melting
system can only be operated using a remote enable signal.
WATER DETECTION CIRCUIT – SHORT CIRCUIT
Check the 090 water detection circuit (black and blue wires, terminals
19 & 20) according to brochure D 090. When the control has this error, the melting
system can only be operated using a remote enable signal.
INTERNAL CONTROL SENSOR – OPEN OR SHORT CIRCUIT
The control has an internal temperature sensor which monitors the temperature
inside the enclosure. If this sensor develops either an open or short circuit, the
control continues to operate normally. This sensor is not field repairable.
INTERNAL CONTROL SENSOR – ENCLOSURE OVERHEATED
This error message is displayed if the enclosure overheats. The 120 V ac variable
speed output stops but the 4 - 20 mA and floating outputs are unaffected. Make sure
the ambient temperature is less than 104
°F (40°C).
090 SENSOR – HEATER MALFUNCTION
Check the 090 heater circuit (red and black wires, terminals
18 & 19) according to brochure D 090. Make sure the yellow and brown wires are
not reversed. When the control has this error, the melting system can only be
operated using a remote enable signal. If this error persists contact your local
tekmar representative.
090 SENSOR - HEATER SHORT CIRCUIT
If the red and black wires on the 090 Sensor are shorted together, the power supply
itself is shorted. When this occurs, the control continuously cycles through the start
of the power up routine. This fault should be repaired immediately or damage to the
control could result.
°F °C
OUTSIDE