Insulation monitors, AAL-2
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TCM-2 Thyristor Control Module TCM-2 ThyristorSHEET Module DATA SHEET DATA Control DATA SHEET Insulation monitors, AAL-2 • Warning delay and power-up delay • Indication of set point on front • Measuring range up to 440 V AC

Data sheet Application The AAL-2 continuously monitors the insulation resistance between the connected AC network (IT network) and protective ground (PE). Due to the warning delay functionality, the AAL-2 can be used in applications with some capacitance. Measuring principle 12 V DC is superimposed on the system that is monitored, and the resulting current is measured. Basic operation The functionality of the product is to measure and monitor the insulation resistance between the network and PE. Functionality The green power indicator will be ON when auxiliary power is connected. The...

Data sheet Advanced functionality Delays To minimise the number of unwanted warnings, delay functionalities are available in the product. Description When powering up the product Delay between warning indication and relay operation By means of a jumper it is possible to select between no warning delay or 4 s warning delay. The shown 22 kΩ set point will accept capacitance up to 260 µF on 1 MΩ range, without false warning. For higher capacitive load, the set point will have to be decreased accordingly. If the resulting set point is unacceptably low, it is recommended to apply a Selectable...

Data sheet Standard products The following products are “off-the-shelf” products with very short delivery times and optimised prices. AAL-2, Standard 1: • • • • Measuring range/scale: 10 to 0 MΩ (corresponding to 0.22 MΩ at scale centre) Red marker pointer NE relay Warning delay: 4 seconds Measuring range/scale: 10 to 0 MΩ (corresponding to 0.22 MΩ at scale centre) Red marker pointer ND relay Warning delay: 4 seconds Measuring range/scale: 1 to 0 MΩ (corresponding to 22 KΩ at scale centre) Red marker pointer ND relay Warning delay: 4 seconds It is not possible to change the configuration of...

Data sheet Warning: If a high-voltage "MEGGER" is used, the AAL-2 must be disconnected at terminal "P" before testing is carried out. Omitting this may result in damage to the AAL-2.

Data sheet Technical specifications Technical specifications DC resistance (Ri): Measuring output voltage: 25/250 uF (depending on settings - see table) Frequency range: 0 to 150 kΩ (if set point above 150 kΩ is selected, warning relay will be disabled) 0 to 1.5 MΩ (if set point above 1.5 MΩ is selected, warning relay will be disabled) Change-over contact Standard: Normally de-energised (ND). Optional: Normally energised (NE) Contact ratings: AC1: 8 A, 250 V AC – DC1: 8 A, 24 V DC AC15: 3 A, 250 V AC – DC13: 3 A, 24 V DC 7 5 Mechanical life: 2 × 10 operations, electrical life: 1 × 10...