Fisher Scientific Isotemp Basic -86C, Installation And Operation Manual

Isotemp Basic       3-3

Fisher Scientific

Section 3

Alarms

Error

Notes

Er00

Name:

Improper model selected.

Description: 

Indicates that DIP SW3 has not selected a proper model or can’t be accessed properly.

Response:

Display shows “Er00” and will not start-up until a proper model is selected. Contact Technical Services.

ErA1

This error condition will prevent peripherals (fans, compressors, etc.) from powering up with the incorrect voltage.

Name:

Voltage/Frequency failure

Description: 

Indicates the measured RMS line voltage did not agree with the logic level sensed by the micros provided by the

installed high voltage PCB; or the measured RMS voltage is not within a tolerable range (<180 VAC < 270 for 230VAC unit /
<85VAC < 160 for 115VAC unit); or the frequency measured over 10 cycles was not within a tolerable range (55 Hz  < Freq < 70 Hz
for 60 Hz units / 40 Hz < Freq < 55 Hz for 50 Hz units)

Response:

This condition is checked at power on reset and if it is active, the unit will NOT power up.  The unit will indefinitely

display “Er_1” in the display and continue to monitor the frequency and voltage.  Furthermore, the audible alarm will sound.  Other
startup error messages may be displayed prior to this message; however, the system will stop the startup sequence for this condi-
tion.

ErA1 .. No pulses (zero crossings) detected to determine frequency (50 / 60 Hz)
ErC1 .. Frequency detected is below 50 Hz
Erd1 .. Frequency detected is above 60 Hz (Possible noise spikes on supply voltage)
ErE1 .. Unit is 230V and the voltage detected is below the low limit (180VRMS)
ErF1 .. Unit is 230V and the voltage detected is above the high limit (260VRMS)
Erg1 .. Unit is 115V and the voltage detected is below the low limit (85VRMS)
ErH1 .. Unit is 115V and the voltage detected is above the high limit (160VRMS)

ErC1

Erd1

ErE1

ErF1

Erg1

ErH1

Er02

Name:  

Control (Cabinet) Sensor Failure

Description:  

This condition indicates that the control sensor has failed to produce a valid reading for >12 consecutive reads (~60

seconds).

Response: 

The unit will stage both compressors on (if necessary) and the unit will attempt to head to bottom out.  If the sensor

recovers, the system will begin to operate normally and respond to the temperature feedback.  The remote alarm contacts will
become active. ‘Er02’ will be added to the main display queue and the last valid cabinet temperature value will not be displayed.

Er03

Name:  

Heat Exchange Sensor Failure

Description:  

This condition indicates that the heat exchange sensor has failed to produce a valid reading for >12 consecutive

reads (~60 seconds).

Response:  

The display will show “Er03” only when the button sequence to read the heat exchange sensor is depressed.