Macromatic TCF Series products protect submersible pumps against damage from
both over temperature and seal leakage. This flexible unit can be connected in one
of three ways to monitor for seal leakage: one probe to ground, two probes to ground
and probe to probe. These products come with a switch to select either automatic
reset or manual reset for an over temperature condition (for automatic reset only in a
standard plug-in enclosure, see the TCP Series products).
The flange-enclosure is designed to be mounted on an inner door and used
with a back-mounted socket (included). Everything needed for setup, use and
troubleshooting is on the top of the unit: status LEDs, switch to choose Automatic or
Manual Reset mode for temperature, and a pushbutton for Manual Reset of an over
temperature condition. They are all visible so that the door need not be opened to see
the status of the over temperature or seal leakage condition.
Operation:
Two wires from the relay are connected to a N.C. thermal switch in the windings of the
pump motor to monitor for overheating. A low-voltage DC signal is applied to check
the status of the thermal switch. Two additional wires are connected to a single or dual
resistance-sensing probe and the grounded motor housing, or across two probes to
monitor for seal leakage using a low-voltage DC signal. These products have isolated
output contact relays, one for over temperature and one for seal leakage. The over
temperature set-point is fixed at 5K ohms. Two adjustable seal leakage sensitivity
ranges are available: 4.7K-100K ohms and 1K-250K ohms.
With input voltage applied, normal temperature condition (thermal switch closed) and
no seal leakage, the over temperature relay is energized and the seal leak relay is
de-energized. Both LEDs are Green, indicating normal conditions and input voltage
applied. When the motor temperature rises and the N.C. thermal switch opens, the
over temperature relay is de-energized, opening a contact that had been closed and
turning off the pump contactor. The TEMP LED turns Red. If the over temperature
condition is cleared, the unit will reset based on the setting of the Over Temp switch.
In the AUTO mode, the unit will reset automatically. In the MANUAL mode, the Over
Temp Reset button must be pushed to clear the alarm and reset the relay.
If the seal starts to leak, contaminating fluid enters the pump motor cavity. This lowers
the resistance between the internal probe and the common connection. When the
resistance drops below the user-adjustable sensitivity set-point of the relay, the output
relay energizes and closes a contact, which can be used to give an alarm indication of
a leaking seal. The SEAL LED turns Red.
Features
- Monitors Submersible Pumps for Over Temperature & Seal Leakage
- Works with Pumps using Resistance Sensing Leakage Detection
- Auto & Manual Reset for Over Temperature
- Flange Enclosure for Door-Mounting
- Two Adjustable Sensitivity Ranges for Seal Leakage
- Low-Profile Adjustment Knobs & Switch
- Full Status Indication on Top of Unit for Easy Troubleshooting
- 11 Pin Back-Mounted
