Heidenhain UM121B
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Product description
The system classification of Heidenhain UM121B-336949-02 leads to modular inverter systems for CNC drives. UM121B operates as a power module with IGBT output stages. It can supply two controlled axes or alternatively one spindle axis. The logic unit generates the PWM signals and transmits them via external 20-pin flat ribbon cables to the power module. In two-axis operation, 15 A per axis is documented. When used as a single-channel spindle module, the rated current is 20 A. These values refer to a switching frequency of 5 kHz. The maximum output current is stated as 30 A. Internal heat dissipation is managed within the inverter system; the assembly also features a connection for a motor holding brake. The IGBT output stages switch the energy provided by the DC intermediate circuit according to the PWM specifications of the control. In two-axis configuration, both motor paths remain separate, while spindle operation utilizes the assembly as a single higher-power channel within Heidenhain's same modular drive system. The modular design separates power electronics from the overarching control logic. This keeps UM121B focused on power implementation and connected motor paths. The two axis channels can be housed together in one assembly, while the alternative spindle configuration utilizes the higher single-channel current. Type number 336949-02 denotes the specific historical version. The assembly measures approximately 480 × 100 × 300 mm; its narrow 100-mm front corresponds to the modular installation format. The weight is approximately 5.5 kg. Complete identification number, channel configuration, current class, PWM connection, brake connection, and mechanical dimensions together form the specific device classification within the UM-100 series for industrial CNC drives.
The item supplied will have the stated manufacturer or type number and the stated condition category. Serial number, manufacturing date, labels, colour, packaging and normal signs of use or storage may differ. Specifications
Unless expressly confirmed, technical information is provided to identify the device type. The complete manufacturer or type number is decisive.
| Manufacturer | Heidenhain |
|---|---|
| Product Series | UM |
| Manufacturer/Order/Identification Number | UM121B-336949-02 |
| Device Type | IGBT Power Module |
| Axis Channels | 2 |
| Rated Current Two-Axis Operation | 2 × 15 A |
| Rated Current Spindle Operation | 1 × 20 A |
| Maximum Current | 30 A |
| Switching Frequency | 5 kHz |
| Power Semiconductor | IGBT |
| Control Connection | external 20-pin flat ribbon cables |
| Brake Connection | Connection for motor holding brake |
| Heat Dissipation | internal |
| Dimensions | approx. 480 × 100 × 300 mm (H × W × D) |
| Weight | approx. 5.5 kg |
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Any stated dispatch or delivery date is an estimate unless expressly confirmed as binding.
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What rated currents are specified for Heidenhain UM121B-336949-02?
In two-axis operation, 15 A per channel applies; in single-channel spindle operation, 20 A is specified.
How are the PWM signals transmitted to UM121B?
The logic unit supplies the PWM signals via external 20-pin flat ribbon cables to the power module.
What applies if an item develops a defect within 14 days?
For the condition categories “Used, removed from an installation” and “New, old stock”, the contractual 14-day right of return in the event of a defect applies. The defect must occur within 14 calendar days after delivery and be reported in text form within the same period.
In particular, the REHA tamper-evident seal must remain fully intact and our RMA approval is required before return. In an accepted case, we decide between replacement and refund. Details in Section 11 of the Terms.
Which shipping methods and delivery times are available?
The shipping method, shipping cost and estimated delivery time are confirmed for the specific order. Depending on the item, destination and urgency, we can check parcel, express or freight shipping as well as collection.
A delivery date is binding only if we expressly confirm it as binding.
Which payment terms apply?
The payment terms stated in the checkout or order confirmation apply. Depending on the order and customer, payment is made in advance or against invoice.
International deliveries and deliveries to new customers are generally made against advance payment unless we expressly confirm another payment arrangement.
Can I return an item ordered incorrectly or found incompatible?
No. There is no general B2B right of return, exchange, cancellation or withdrawal. Incorrect or duplicate orders and a lack of suitability or compatibility with the customer’s installation are not covered by the contractual 14-day right of return in the event of a defect. Details in Section 12 of the Terms.
Can I request individual pricing for several items?
You may request an individual quotation for several items or larger quantities. We then check availability and pricing for the specific requirement; there is no entitlement to a quantity discount. Open the quick enquiry.
Do you also purchase industrial spare parts?
Yes. You can offer us automation and drive components for purchase. Please provide complete type numbers, quantities, condition details and photographs where possible.
After review, we will tell you whether a purchase is possible and on which terms. Learn more about selling industrial stock.
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