The direct drive series removes the chain-and-sprocket reduction between motor and door. Fewer moving parts in the drivetrain means less to wear, less to adjust, and a quieter machine, which is why these turn up on newer installations where lifespan and reliability were the specification priorities.
What This Operator Suits
DT-Series is for counterbalanced sectional doors. DH-Series and DS-Series are for non-counterbalanced sectional or rolling doors. All three target applications where performance, reliability, speed and lifespan need optimising.
The motors are the notable part. The DT-Series runs a 1 HP 3-phase inverter-duty rated motor, totally enclosed (TENV), IP-55. The DH-Series scales to 1 to 7.5 HP 3-phase, inverter-duty brake motor, totally enclosed, IP-55. Inverter-duty rating means the motor is built to be driven by a variable frequency drive without the insulation breakdown a standard motor suffers; IP-55 means sealed against dust and low-pressure water jets.
That combination points at wash-down environments, food processing, and dusty industrial sites where an open drip proof motor would not last.
Specification
| Item | Detail |
|---|---|
| Motor (DT-Series) | Inverter-duty rated, 1 HP 3-phase, totally enclosed (TENV), IP-55 |
| Motor (DH-Series) | Inverter-duty rated brake motor, 1 to 7.5 HP 3-phase, totally enclosed, IP-55 |
| Reduction | High-end worm gear reducer, direct drive, no chain-and-sprocket step to the operator shaft |
| Brake | DTB / DTBC models only: optional 24VDC disc brake with manual brake release |
| Manual operation | Three options: hand crank, floor level disconnect, or chain hoist with electrical interlock that cuts motor power when manual operation is engaged |
| Limit system | Single-turn mechanical limit system. Motor removable without affecting the limits; settings remain synchronized during manual operation |
Duty rating in plain terms. Industrial, optimised for lifespan and speed.
What Fails on This Unit
Direct drive removes the chain wear that dominates service on the belt-and-chain range, so the failure profile shifts. What is left is the motor, the VFD driving it, the gear reducer, and the limit system.
Because these are inverter-duty motors, a fault often lives in the drive rather than the motor. A door behaving oddly on a direct drive unit, hunting, stopping short, running slow, needs the VFD parameters checked before anyone condemns the motor.
The single-turn mechanical limit system is simpler than the rotary cams elsewhere in the range and holds its settings through manual operation and motor removal, which makes limit drift a less common complaint on these units.
Manufacturer Documents
Originals from Manaras-Opera, useful if the paperwork for a unit already in your building has gone missing:
- Specification sheet (DT-Series)
- Specification sheet (DH-Series)
- Specification sheet (DS-Series)
- Sell sheet (DT-Series)
- Sell sheet (DH-Series)
- Dimension drawing (DTB-B)_dim_2023-09-21.pdf)
Choosing Between Models
For chain-driven equivalents see the OPH/OPJ jackshafts. If you are unsure which unit you have, the model code is on the data plate on the operator housing. Note the voltage and phase while you are there, and roughly how many cycles a day the door runs, those three facts decide most of what we would bring to a call.
See the full Manaras model reference for the whole range, or Manaras operator repair for service.
Parts and Accessories
Manaras publish a full accessory range that pairs with this operator: monitored and non-monitored photoelectric cells, light curtains, electric and pneumatic sensing edges, interface modules, push-button and key switch control stations, pull switches, keypads and card readers, radio receivers and transmitters, and traffic light kits.
One point that causes repeated confusion: on a UL 325 monitored circuit, a failed safety device makes the operator refuse to close. That is correct behaviour, not a malfunction. A door that suddenly will not close, with no other symptom, is very often a photo eye or sensing edge that has failed or drifted out of alignment.
- Accessory catalogue (PDF)
- Accessories and replacement components list (PDF)
- Radio Series 900 dip-switch compatibility chart (PDF)
- Radio Series 100 rolling code compatibility chart (PDF)
- Operator codes explained (PDF)
We stock the common wear items for the Opera and MEGA series, control boards, clutches, solenoid coils, limit switch assemblies and safety edges. Anything we do not carry we source through our distributor, and you will hear about a lead time before we attend rather than after.
Frequently Asked Questions
How do I confirm I have a DT?
The model code is on the data plate on the operator housing. If the plate is unreadable, which happens on older units in damp parkades, send us a photo of the operator and we can usually identify it from the frame and drive layout.
Do you stock parts for it?
We carry the common wear parts across the Opera and MEGA series. Model-specific components come through our distributor, typically within two business days.
Is it worth repairing or should we replace it?
Clutches, brakes, boards, limits, safety devices and wiring are repairs. A seized gear reducer or a burnt-out motor on a very old unit is usually a replacement. We tell you which one you are looking at and why, rather than leading with a new-operator quote.
Can you service a unit we did not buy from you?
Yes. Most Manaras units we attend were installed by someone else, often years ago.
The door will not close but opens fine. Is the operator dead?
Almost certainly not. That is the classic monitored safety circuit symptom, a photo eye, light curtain or sensing edge that has failed or moved. Check the lenses are clean, the alignment is good, and nothing is parked in the beam before assuming the worst.