Unitemp Blog

The display of the temperature controller continuously flashes during start-up. What does this mean?
17.12.2015

The display should only flash for the first few seconds after start-up. If it continues to flash the power supply is possibly faulty and must be repaired. Kindly download a customer request form, complete and send to Thermon SA (Pty) Ltd. for quote on repair.

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How many solid state relays can I drive with a type D logic output from a temperature controller?
17.12.2015

You may drive a maximum of 3 GTS gefran solid state relays - this may differ for other SSR brands.

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Gefran controllers: LED 1 of the controller flashes on start-up. What does this mean?
17.12.2015

This is a possible indication of an instrument that is in Soft-start mode - a function that serves to avoid thermal shock to a heating system. To check if controller is set for soft-start, follow these steps:

  1. Press and hold the button until is displayed
  2. Using buttons configure value to...
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Gefran controllers: What is auto-tuning and how can I set it up?
17.12.2015

Auto-tuning is an automatic procedure that calculates the best PID control parameters. It is used when the process variable is close to the set point.

SETUP:

  1. Press and hold the button until is displayed
  2. Using buttons configure value to 99...
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Gefran controllers: What is self tuning and how can I set it up?
17.12.2015

Self-tuning is an automatic procedure that calculates the best PID control parameters. Self-tuning may only be used when process is launched.

SETUP:

  1. Press and hold the button until is displayed
  2. Using buttons configure value to 99...
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Gefran controller: Can I change the retransmission analogue output to a control output on a 600-x-x-W-x-x?
17.12.2015

Yes, the 'W' output card can be used for retransmission or control. For retransmission set An.o = 0 , for control set An.o = 5 or 6.

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Gefran controller: How can I retransmit the PV to a PLC with 4-20mA on a 600-x-x-W-x-x?
17.12.2015

The standard retransmission setting is 0-10V, but can be changed to 2-10V/ 0-20mA or 4-20mA.

  1. Step:
    S1 = ON (0 -10Vdc) Standard | S1 = ON (Jumper terminals bridged)
    S1=OFF (0-20mA) | S1 = OFF (Jumper terminals open)
    Change the jumper setting on the...
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Gefran controller: Can the analog output on a 600-x-x-C-x-x be converted from 0-10V to 4-20mA?
15.12.2015

Yes, although 0-10V is the standard output, the analogue signal can be changed to 4-20mA.

  1. Step:
    S1 = ON (0 -10Vdc) Standard
    S1 = OFF (0-20mA)
    Change the jumper setting on the analogue output card as required
  2. Step...
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Gefran controller: Can the analog output on a 600-x-x-C-x-x be converted from 0-10V to 2-10V?
15.12.2015

Yes, although 0-10V is the standard output, the analogue signal can be changed to 2-10V.

  1. Press and hold the button until appears;
  2. Press the button repeatedly until...
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Gefran controller: I cannot access the hardware (Hrd) menu. Help!
15.12.2015
  1. Press and hold the key until is displayed;
  2. Using the keys, configure value to 99...
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