NORD Drivesystems B1000 - Manual (Page 15)

www.nord.com A13 G1000 – Subject to Change Without Notice
INTRODUCTION
Selection
Information
General Warnings & Cautions
Applications with risk of personal injury should be
reviewed together with NORD. Examples of these are
hoist, lifts or other applications where people may be
at risk.
Helical-worm Effi ciency
NORD worm gear units can reach effi ciencies up to 92%.
Worm gears require a run-in period to reach their peak
effi ciency. Due to this the unit effi ciency will be low-
er when the gear unit is new. The effect is greater at
lower worm incline angles meaning with worms that
have a low number of worm starts (or leads). Based on
experience the following reduction in effi ciency
should be considered before the run-in is completed
Worm Starts (leads) Reduction in effi ciency
1 12%
2 6%
3 3%
6 2%
The number of worm starts is listed in the gear ratio
tables in the helical-worm reducer ratings tables.
The run-in period is approximately 25 hours of opera-
tion at maximum load.
Following conditions must be met in order to reach
the catalog effi ciency values.
- Gear unit is fully run-in
- Gear unit has reached a constant temperature
- The required type of lubricant is used
- The required lubrication quantity is used
- The unit is operating at full rated torque
Vertical Mounting Position for Gear Units & Motors
Observe thermal limit rating – see page 14. For mo-
tors which are mounted vertically upwards (Mounting
position M4) and ratios < 24, we highly recommend
oil expansion chambers in order to avoid leakage
through the vent plug.
NEMA and IEC adapters use in hoist, lifts and other
applications with danger of personal injury should be
reviewed together with NORD.
NEMA/IEC adapter have additional shaft coupling
and additional bearing seats compared to integral
motors so there are higher no-load losses with NEMA
or IEC adapters. We recommend mounting the motor
directly, since it offers both technical and cost advan-
tages.
External Installation, Tropical Use
Gearboxes installed outside, in damp rooms, or used in
the tropics may require special seals & anti-corrosion
options. Please contact NORD for application assistance.
Special conditions
If special environmental or other conditions exist in
transit, storage or operation these need to be con-
sidered in the unit selection. Special conditions may
include (but are not limited to) the following:
- Exposure to aggressive corrosive materials
(contaminated air, gasses, acids, bases, salts, etc.)
- Very high relative humidity
- Direct contact between t he motor and liquid
- Material build- up on the gear unit or motor
(dirt, dust, sand, etc.)
- High atmospheric pressure
- Radiation
- Extreme temperatures, high, low or large temp.
changes
- High vibration, accelerations, shock or impacts
- Other abnormal conditions
Storage Before Installation
The gear units and motors should be stored in a dry
area before they are to be installed. Special measures
are required for longer storage. Please request long
term storage instructions from NORD Gear or from
the NORD web site.
Multi-stage Gear Units
With 4-, 5-, 6-stage multi-stage gear units, there are
additional no-load loss due to the added rotating
parts and the relatively small drive input power. Thus,
a no-load loss of approximately 40 watts for 4-pole
motors up to 1 HP (0.75 kW) is accounted for in the
performance tables.
NEMA C-Face Adapter Capacity
The NEMA adapters are designed to handle the
torques produced by the standard NEMA power as-
signment at 4 pole (1800 rpm) motor speeds. If a larg-
er motor power is used than the power below NORD
should be consulted. Also if a NEMA adapter is be-
ing used for other than an AC induction motor NORD
should be consulted.
Adapter Max Power
[hp]
Adapter Max Power
[hp]
56C 1 250TC 20
140TC 2 280TC 30
180TC 5 320TC 50
210TC 10 360TC 75